Tamar Thesis CEBAF - Revision history

https://wiki.iac.isu.edu/index.php?action=history&feed=atom&title=Tamar_Thesis_CEBAF Tamar Thesis CEBAF - Revision history 2026-11-10T10:17:02Z Revision history for this page on the wiki MediaWiki 1.43.0 https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=79387&oldid=prev Didbtama: /* Notes */ 2012-12-10T06:46:43Z

<p><span class="autocomment">Notes</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 06:46, 10 December 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l41">Line 41:</td> <td colspan="2" class="diff-lineno">Line 41:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Delta_D_over_D]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Delta_D_over_D]]</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[https://wiki.iac.isu.edu/index.php/SIDIS_PionAsym_EG2000 Go Back]</ins></div></td></tr>  </table>

Didbtama https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74520&oldid=prev Didbtama at 17:11, 23 May 2012 2012-05-23T17:11:09Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:11, 23 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l34">Line 34:</td> <td colspan="2" class="diff-lineno">Line 34:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The electron beam quality during the experiment is monitored with several devices: Mott polarimeter, Moller polarimeter, faraday cup and harp scan. The beam polarization is monitored using a 5 MeV Mott polarimeter at the injector and a Moller polarimeter in Hall B, which is located upstream to the target position. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)% <ref name="Grun1997> Grún, E.<del style="font-weight: bold; text-decoration: none;">; </del>Krúger, H.<del style="font-weight: bold; text-decoration: none;">; </del>Dermott, S.<del style="font-weight: bold; text-decoration: none;">; </del>Fechtig, H.<del style="font-weight: bold; text-decoration: none;">; </del>Graps, A. L.<del style="font-weight: bold; text-decoration: none;">; </del>Zook, H. A.<del style="font-weight: bold; text-decoration: none;">; </del>Gustafson, B. A.<del style="font-weight: bold; text-decoration: none;">; </del>Hamilton, D. P.<del style="font-weight: bold; text-decoration: none;">; </del>Hanner, M. S.<del style="font-weight: bold; text-decoration: none;">; </del>Heck, A.<del style="font-weight: bold; text-decoration: none;">; </del>Horányi, M.<del style="font-weight: bold; text-decoration: none;">; </del>Kissel, J.<del style="font-weight: bold; text-decoration: none;">; </del>Lindbad, B. A.<del style="font-weight: bold; text-decoration: none;">; </del>Linkert, D.<del style="font-weight: bold; text-decoration: none;">; </del>Linkert, G.<del style="font-weight: bold; text-decoration: none;">; </del>Mann, I.<del style="font-weight: bold; text-decoration: none;">; </del>Mcdonnell, J. A. M.<del style="font-weight: bold; text-decoration: none;">; </del>Morfill, G. E.<del style="font-weight: bold; text-decoration: none;">; </del>Polanskey, C.<del style="font-weight: bold; text-decoration: none;">; </del>Schwehm, G.<del style="font-weight: bold; text-decoration: none;">; </del>Srama, R. (1997). A double-arm Møller Polarimeter for Jefferson Lab's Hall B. Geophysical Research Letters, v. 24, No. '''17''', p. 2171.</ref>. Whereas, the integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that measures the beam charge when swept through the beam. <br></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The electron beam quality during the experiment is monitored with several devices: Mott polarimeter, Moller polarimeter, faraday cup and harp scan. The beam polarization is monitored using a 5 MeV Mott polarimeter at the injector and a Moller polarimeter in Hall B, which is located upstream to the target position. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)% <ref name="Grun1997> Grún, E. Krúger, H. Dermott, S. Fechtig, H. Graps, A. L. Zook, H. A. Gustafson, B. A. Hamilton, D. P. Hanner, M. S. Heck, A. Horányi, M. Kissel, J. Lindbad, B. A. Linkert, D. Linkert, G. Mann, I. Mcdonnell, J. A. M. Morfill, G. E. Polanskey, C. Schwehm, G. Srama, R. (1997). A double-arm Møller Polarimeter for Jefferson Lab's Hall B. Geophysical Research Letters, v. 24, No. '''17''', p. 2171<ins style="font-weight: bold; text-decoration: none;">.</ref> <ref name="Raue1998>B. A. Raue, L. H. Kramer, R. M. Chasteler, S. J. Gaff, J. Kelly, C. Laymon, M. Spraker, H. Weller, D. S. Carman, S. Boiarinov, V. Burkert, A. Freyberger. (1998). A double-arm Møller Polarimeter for Jefferson Lab's Hall B. Bull. Am. Phys. Soc., '''43''', 1543</ins>.</ref>. Whereas, the integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that measures the beam charge when swept through the beam. <br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"> There should be either CLAS note or NIM publication on the Moller polarimeter and the hard scanner, I am not sure if there is one for the FC.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>  </table>

Didbtama https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74519&oldid=prev Didbtama at 17:06, 23 May 2012 2012-05-23T17:06:48Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:06, 23 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l34">Line 34:</td> <td colspan="2" class="diff-lineno">Line 34:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The electron beam quality during the experiment is monitored with several devices: Mott polarimeter, Moller polarimeter, faraday cup and harp scan. The beam polarization is monitored using a 5 MeV Mott polarimeter at the injector and a Moller polarimeter in Hall B, which is located upstream to the target position. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. Whereas, the integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that measures the beam charge when swept through the beam. <br></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The electron beam quality during the experiment is monitored with several devices: Mott polarimeter, Moller polarimeter, faraday cup and harp scan. The beam polarization is monitored using a 5 MeV Mott polarimeter at the injector and a Moller polarimeter in Hall B, which is located upstream to the target position. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)% <ins style="font-weight: bold; text-decoration: none;"><ref name="Grun1997> Grún, E.; Krúger, H.; Dermott, S.; Fechtig, H.; Graps, A. L.; Zook, H. A.; Gustafson, B. A.; Hamilton, D. P.; Hanner, M. S.; Heck, A.; Horányi, M.; Kissel, J.; Lindbad, B. A.; Linkert, D.; Linkert, G.; Mann, I.; Mcdonnell, J. A. M.; Morfill, G. E.; Polanskey, C.; Schwehm, G.; Srama, R. (1997). A double-arm Møller Polarimeter for Jefferson Lab's Hall B. Geophysical Research Letters, v. 24, No. '''17''', p. 2171.</ref></ins>. Whereas, the integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that measures the beam charge when swept through the beam. <br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> There should be either CLAS note or NIM publication on the Moller polarimeter and the hard scanner, I am not sure if there is one for the FC.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> There should be either CLAS note or NIM publication on the Moller polarimeter and the hard scanner, I am not sure if there is one for the FC.</div></td></tr>  </table>

Didbtama https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74123&oldid=prev Foretony at 17:53, 10 May 2012 2012-05-10T17:53:19Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:53, 10 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l35">Line 35:</td> <td colspan="2" class="diff-lineno">Line 35:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The electron beam quality during the experiment is monitored with several devices: Mott polarimeter, Moller polarimeter, faraday cup and harp scan. The beam polarization is monitored using a 5 MeV Mott polarimeter at the injector and a Moller polarimeter in Hall B, which is located upstream to the target position. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. Whereas, the integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that measures the beam charge when swept through the beam. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The electron beam quality during the experiment is monitored with several devices: Mott polarimeter, Moller polarimeter, faraday cup and harp scan. The beam polarization is monitored using a 5 MeV Mott polarimeter at the injector and a Moller polarimeter in Hall B, which is located upstream to the target position. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. Whereas, the integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that measures the beam charge when swept through the beam. <br></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> There should be either CLAS note or NIM publication on the Moller polarimeter and the hard scanner, I am not sure if there is one for the FC.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>  </table>

Foretony https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74118&oldid=prev Didbtama: /* Notes */ 2012-05-10T16:12:26Z

<p><span class="autocomment">Notes</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:12, 10 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l39">Line 39:</td> <td colspan="2" class="diff-lineno">Line 39:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><references/></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><references/></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">http://www.jlab.org/div_dept/admin/publications/papers/92/PR92-019.pdf</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Delta_D_over_D]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Delta_D_over_D]]</div></td></tr>  </table>

Didbtama https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74116&oldid=prev Didbtama at 16:08, 10 May 2012 2012-05-10T16:08:43Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:08, 10 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l34">Line 34:</td> <td colspan="2" class="diff-lineno">Line 34:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The <ins style="font-weight: bold; text-decoration: none;">electron </ins>beam quality <ins style="font-weight: bold; text-decoration: none;">during the experiment </ins>is monitored <ins style="font-weight: bold; text-decoration: none;">with several </ins>devices<ins style="font-weight: bold; text-decoration: none;">: Mott polarimeter, Moller polarimeter, faraday cup and harp scan</ins>. The beam polarization is monitored using a 5 MeV Mott polarimeter <ins style="font-weight: bold; text-decoration: none;">at the injector </ins>and a Moller polarimeter in Hall B<ins style="font-weight: bold; text-decoration: none;">, which is located upstream to the target position</ins>. The average electron beam polarization during the EG1b experiment measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. <ins style="font-weight: bold; text-decoration: none;">Whereas, the </ins>integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that <ins style="font-weight: bold; text-decoration: none;">measures </ins>the beam charge when swept through the beam. <br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"> </del>The <del style="font-weight: bold; text-decoration: none;">paragraph below seems to lack focus. You talking about how the </del>beam quality is monitored<del style="font-weight: bold; text-decoration: none;">. </del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"> Write an intro sentence from this perspective which introduces the </del>devices <del style="font-weight: bold; text-decoration: none;">you will describe in the remaining sentences of the paragraph</del>.</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization during the EG1b experiment <del style="font-weight: bold; text-decoration: none;">was </del>measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. <del style="font-weight: bold; text-decoration: none;"><br></del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">The </del>integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored using beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires that <del style="font-weight: bold; text-decoration: none;">measure </del>the beam charge when swept through the beam. <br></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>  </table>

Didbtama https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74065&oldid=prev Foretony at 03:57, 9 May 2012 2012-05-09T03:57:26Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:57, 9 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l34">Line 34:</td> <td colspan="2" class="diff-lineno">Line 34:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> The paragraph below seems to lack focus. You talking about how the beam quality is monitored. </ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> Write an intro sentence from this perspective which introduces the devices you will describe in the remaining sentences of the paragraph.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization during the EG1b experiment was measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization during the EG1b experiment was measured by the Hall B moller polarimeter to be (<math>70\pm5</math>)%. <br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored <del style="font-weight: bold; text-decoration: none;">with a three </del>beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires <del style="font-weight: bold; text-decoration: none;">moved around </del>the beam. <br></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored <ins style="font-weight: bold; text-decoration: none;">using </ins>beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires <ins style="font-weight: bold; text-decoration: none;">that measure the beam charge when swept through </ins>the beam. <br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>  </table>

Foretony https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74064&oldid=prev Foretony at 03:51, 9 May 2012 2012-05-09T03:51:13Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:51, 9 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l34">Line 34:</td> <td colspan="2" class="diff-lineno">Line 34:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="HansknechtPoelker2006> Hansknecht*, J. and Poelker, M. (2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb-doped fiber amplifier. Phys. Rev. ST Accel. Beams '''9''', 063501.</ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization <del style="font-weight: bold; text-decoration: none;">achieved </del>during the EG1b experiment was <del style="font-weight: bold; text-decoration: none;">around </del>(<math>70\pm5</math>)%. <br></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization during the EG1b experiment was <ins style="font-weight: bold; text-decoration: none;">measured by the Hall B moller polarimeter to be </ins>(<math>70\pm5</math>)%. <br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored with a three beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires moved around the beam. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored with a three beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires moved around the beam. <br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=Notes=</div></td></tr>  </table>

Foretony https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74052&oldid=prev Didbtama at 14:17, 8 May 2012 2012-05-08T14:17:41Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:17, 8 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l33">Line 33:</td> <td colspan="2" class="diff-lineno">Line 33:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|'''Table 1.''' The CEBAF accelerator parameters <ref name="Grunder1987"> Grunder, H.A., et al. (1987). The Continuous Electron Beam Accelerator Facility. '''CEBAF-PR-87-017'''.</ref></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|'''Table 1.''' The CEBAF accelerator parameters <ref name="Grunder1987"> Grunder, H.A., et al. (1987). The Continuous Electron Beam Accelerator Facility. '''CEBAF-PR-87-017'''.</ref></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="<del style="font-weight: bold; text-decoration: none;">HansknechtPoelker2J. </del>Hansknecht* and M. <del style="font-weight: bold; text-decoration: none;">Poelker, PHYSICAL REVIEW SPECIAL TOPICS </del>- <del style="font-weight: bold; text-decoration: none;">ACCELERATORS AND BEAMS </del>9, 063501 <del style="font-weight: bold; text-decoration: none;">(2006)</del></ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ref name="<ins style="font-weight: bold; text-decoration: none;">HansknechtPoelker2006> </ins>Hansknecht*<ins style="font-weight: bold; text-decoration: none;">, J. </ins>and <ins style="font-weight: bold; text-decoration: none;">Poelker, </ins>M. <ins style="font-weight: bold; text-decoration: none;">(2006). Synchronous photoinjection using a frequency-doubled gain-switched fiber-coupled seed laser and ErYb</ins>-<ins style="font-weight: bold; text-decoration: none;">doped fiber amplifier. Phys. Rev. ST Accel. Beams '''</ins>9<ins style="font-weight: bold; text-decoration: none;">'''</ins>, 063501<ins style="font-weight: bold; text-decoration: none;">.</ins></ref>. When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization achieved during the EG1b experiment was around (<math>70\pm5</math>)%. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization achieved during the EG1b experiment was around (<math>70\pm5</math>)%. <br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored with a three beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires moved around the beam. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored with a three beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires moved around the beam. <br></div></td></tr>  </table>

Didbtama https://wiki.iac.isu.edu/index.php?title=Tamar_Thesis_CEBAF&diff=74051&oldid=prev Didbtama at 14:05, 8 May 2012 2012-05-08T14:05:42Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:05, 8 May 2012</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l33">Line 33:</td> <td colspan="2" class="diff-lineno">Line 33:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|'''Table 1.''' The CEBAF accelerator parameters <ref name="Grunder1987"> Grunder, H.A., et al. (1987). The Continuous Electron Beam Accelerator Facility. '''CEBAF-PR-87-017'''.</ref></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|'''Table 1.''' The CEBAF accelerator parameters <ref name="Grunder1987"> Grunder, H.A., et al. (1987). The Continuous Electron Beam Accelerator Facility. '''CEBAF-PR-87-017'''.</ref></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}<br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<del style="font-weight: bold; text-decoration: none;">.</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Polarized electron beams are created at JLab using a GaAs photocathode. The polarized electrons are produced by bandgap photoemission from a strained GaAs cathode using a tunable Ti-Saphire laser having wavelengths from 780 to 850 nm with at least 500mW of output power<ins style="font-weight: bold; text-decoration: none;"><ref name="HansknechtPoelker2J</ins>. Hansknecht* and M. Poelker, PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS 9, 063501 (2006)<ins style="font-weight: bold; text-decoration: none;"></ref>. </ins>When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">J</del>. Hansknecht* and M. Poelker, PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS 9, 063501 (2006)</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"> </del>When the cathode is exposed to circularly polarized laser light, polarized electrons move from the valence region to the conduction band. In order to free the electrons from the conduction band, the surface of the GaAs cathode is coated with a single layer of cesium and fluorine. As a result, electrons in the conduction band are bound to the surface of the material by only 4 eV. For the EG1b experiment, the direction of the electron polarization was flipped with a frequency of 1 Hz by reversing the laser polarization using a pockel cell. The electron beam polarization for each hall can be changed with a Wien Filter, it can rotate electron spin without changing its momentum. <ref name="Engwall1992"> Engwall, D.A., et al. (1992). A spin manipulator for electron accelerators. '''CEBAF-PR-92-019'''</ref><br></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization achieved during the EG1b experiment was around (<math>70\pm5</math>)%. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The beam polarization is monitored using a 5 MeV Mott polarimeter and a Moller polarimeter in Hall B. The average electron beam polarization achieved during the EG1b experiment was around (<math>70\pm5</math>)%. <br></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored with a three beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires moved around the beam. <br></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The integrated electron beam current is measured using a Farady cup. The Faraday cup is located downstream of the CLAS target and contains several layers of lead and scintillator in order to create a large amount of detected secondary particles from the primary electron beam. The position of the beam is monitored with a three beam position monitors. The profile of the beam is monitored with a harp scan, a device with thin iron and tungsten wires moved around the beam. <br></div></td></tr>  </table>

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