https://wiki.iac.isu.edu/index.php?action=history&feed=atom&title=2018_NSF_Proposal2018 NSF Proposal - Revision history2026-11-10T07:32:36ZRevision history for this page on the wikiMediaWiki 1.43.0https://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=126281&oldid=prevForetony at 17:55, 27 November 20192019-11-27T17:55:27Z<p></p>
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</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125667&oldid=prevForetony at 03:48, 19 November 20182018-11-19T03:48:22Z<p></p>
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</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125665&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-19T01:42:37Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
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<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>[[File:PolTarg_2018.png | 200 px]][[File:DeltaDoverD_2018.png | 200 px]][[File:<del style="font-weight: bold; text-decoration: none;">DeltaDoverDPrecDrop_2018</del>.png | 200 px]]</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>[[File:PolTarg_2018.png | 200 px]][[File:DeltaDoverD_2018.png | 200 px]][[File:<ins style="font-weight: bold; text-decoration: none;">DeltaDoverDPrecIncrease_2018</ins>.png | 200 px]]</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>The pQcd prediction is shown as a solid filled circle while the open circle represents the results from ref ~\cite{ISgur1999}, ~\cite{Roberts2013}. The red dash-dot line is a dyson-swinger euation calculation from reference ~\cite{Cloet2005}. The blue dashed line is an early parameterization of the world data from ~\cite{Leader1998}. The blue line and blue dash-dot curve are parametrization fits to the world data from reference ~\cite{Avakian2007} with and without the pQCD constraint when non zero angular momentum states are included. The solid red and dashed red curves are a more recent parameterization of the world data set from reference ~\cite{JAM15} without and with the pQCD prediction respectively. </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 pQcd prediction is shown as a solid filled circle while the open circle represents the results from ref ~\cite{ISgur1999}, ~\cite{Roberts2013}. The red dash-dot line is a dyson-swinger euation calculation from reference ~\cite{Cloet2005}. The blue dashed line is an early parameterization of the world data from ~\cite{Leader1998}. The blue line and blue dash-dot curve are parametrization fits to the world data from reference ~\cite{Avakian2007} with and without the pQCD constraint when non zero angular momentum states are included. The solid red and dashed red curves are a more recent parameterization of the world data set from reference ~\cite{JAM15} without and with the pQCD prediction respectively. </div></td></tr>
</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125664&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-19T01:42:01Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
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<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>[[File:PolTarg_2018.png | 200 px]][[File:DeltaDoverD_2018.png | 200 px]]</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>[[File:PolTarg_2018.png | 200 px]][[File:DeltaDoverD_2018<ins style="font-weight: bold; text-decoration: none;">.png | 200 px]][[File:DeltaDoverDPrecDrop_2018</ins>.png | 200 px]]</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>The pQcd prediction is shown as a solid filled circle while the open circle represents the results from ref ~\cite{ISgur1999}, ~\cite{Roberts2013}. The red dash-dot line is a dyson-swinger euation calculation from reference ~\cite{Cloet2005}. The blue dashed line is an early parameterization of the world data from ~\cite{Leader1998}. The blue line and blue dash-dot curve are parametrization fits to the world data from reference ~\cite{Avakian2007} with and without the pQCD constraint when non zero angular momentum states are included. The solid red and dashed red curves are a more recent parameterization of the world data set from reference ~\cite{JAM15} without and with the pQCD prediction respectively. </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 pQcd prediction is shown as a solid filled circle while the open circle represents the results from ref ~\cite{ISgur1999}, ~\cite{Roberts2013}. The red dash-dot line is a dyson-swinger euation calculation from reference ~\cite{Cloet2005}. The blue dashed line is an early parameterization of the world data from ~\cite{Leader1998}. The blue line and blue dash-dot curve are parametrization fits to the world data from reference ~\cite{Avakian2007} with and without the pQCD constraint when non zero angular momentum states are included. The solid red and dashed red curves are a more recent parameterization of the world data set from reference ~\cite{JAM15} without and with the pQCD prediction respectively. </div></td></tr>
</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125646&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-08T17:14:13Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
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<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>Fig.~\ref{fig:DeltaDoverD} show the data for $\Delta d(x)/d(x)$ from HERMES and JLab measured in a kinematic range where the down quark carried a fraction of the nucleon's momentum ($x_B$) that was less than 0.6. The HERMES measurement used both Inclusive and Semi-Inclusive Deep Inelastic (SIDIS) scattering while the JLab measurements used fits to inclusive electron scattering measurements of polarized structure functions ($g$) and unpolarized structure function ($F$) of the proton, deuteron, and He-3 as well as the ratio of up and down quark distributions from proton and deuteron data.</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>Fig.~\ref{fig:DeltaDoverD} show the data for $\Delta d(x)/d(x)$ from HERMES and JLab measured in a kinematic range where the down quark carried a fraction of the nucleon's momentum ($x_B$) that was less than 0.6. The HERMES measurement used both Inclusive and Semi-Inclusive Deep Inelastic (SIDIS) scattering while the JLab measurements used fits to inclusive electron scattering measurements of polarized structure functions ($g$) and unpolarized structure function ($F$) of the proton, deuteron, and He-3 as well as the ratio of up and down quark distributions from proton and deuteron data.</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>While predictions of $\<del style="font-weight: bold; text-decoration: none;">Deltad</del>(x)/d(x)$ using the constituent quark model (CQM)~\<del style="font-weight: bold; text-decoration: none;">site</del>{Isgur1999} ~\cite{Cloet20015}, and the Dyson-Swinger equations~\cite{Roberts2013} predicts $\frac{\Delta d}{d}$ remains negative as $x_B$ approaches unity, perturbative quantum chromodynamics (pQCD) predicts that it will become positive, as shown in a Fig.~\ref{fig:DeltaDoverD}. This large difference between the two predictions now relies on experiment to resolve the disagreement. The current measurements in Fig.~\ref{fig:DeltaDoverD} have not shown a clear indication of this predicted sign change as there is a sparsity of data beyond $x_B > 0.5$. There is a clear need to perform measurements above $x_B$ of 0.5 in order to evaluate the veracity of the pQCD and CQM predictions.</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>While predictions of $\<ins style="font-weight: bold; text-decoration: none;">Delta d</ins>(x)/d(x)$ using the constituent quark model (CQM)~\<ins style="font-weight: bold; text-decoration: none;">cite</ins>{Isgur1999} ~\cite{Cloet20015}, and the Dyson-Swinger equations~\cite{Roberts2013} predicts $\frac{\Delta d}{d}$ remains negative as $x_B$ approaches unity, perturbative quantum chromodynamics (pQCD) predicts that it will become positive, as shown in a Fig.~\ref{fig:DeltaDoverD}. This large difference between the two predictions now relies on experiment to resolve the disagreement. The current measurements in Fig.~\ref{fig:DeltaDoverD} have not shown a clear indication of this predicted sign change as there is a sparsity of data beyond $x_B > 0.5$. There is a clear need to perform measurements above $x_B$ of 0.5 in order to evaluate the veracity of the pQCD and CQM predictions.</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>One of the goals of experiment PR12-06-109, in JLab's Hall B, is to measure $\frac{\Delta d}{d}$ above $x_B$ of 0.5. Fig.~\ref{fig:DeltaDoverD} illustrates the precision that may be achieved using the CLAS12 apparatus. In particular, the measurement at $x_B$ of 0.7 should distinguish between the two prediction at the 2$\sigma$ level. </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>One of the goals of experiment PR12-06-109, in JLab's Hall B, is to measure $\frac{\Delta d}{d}$ above $x_B$ of 0.5. Fig.~\ref{fig:DeltaDoverD} illustrates the precision that may be achieved using the CLAS12 apparatus. In particular, the measurement at $x_B$ of 0.7 should distinguish between the two prediction at the 2$\sigma$ level. </div></td></tr>
</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125645&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-08T17:10:09Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:10, 8 November 2018</td>
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<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>Existing CLAS data from 6 GeV have already made an impact on these fits. The expected data from the proposed experiment at 11~GeV will further reduce the uncertainties of these distributions as seen inf Fige.~\ref{fig:JAM15} from the JAM collaboration~\cite{Jimeniez2014_JAM15}</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>Existing CLAS data from 6 GeV have already made an impact on these fits. The expected data from the proposed experiment at 11~GeV will further reduce the uncertainties of these distributions as seen inf Fige.~\ref{fig:JAM15} from the JAM collaboration~\cite{Jimeniez2014_JAM15}</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>JLab's energy upgrade to 12 GeV will facilitate the above measurements. As a service to Hall~B and to satisfy the needs of experiment E12-06-109, co-PI Forest was responsible for the construction of five drift chambers. These drift chambers are approximately 6 feet high and contain over 5,000 wires. ISU constructed and tested these drift chambers that are now in operation in Hall B. The CEBAF Large Acceptance Spectrometer in Hall~B has just began twelve GeV era research program. Preparations for the next phase of experiment E12-06-109, the experiment readiness review, is scheduled for March of 2018 and the experiment is currently schedule to run in the Fall of 2020. As part of this review Co-PI Forest developed a geometrical description of the proposed dual polarized target system and presented that design at the 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan on October 27, 2018. </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>JLab's energy upgrade to 12 GeV will facilitate the above measurements. As a service to Hall~B and to satisfy the needs of experiment E12-06-109, co-PI Forest was responsible for the construction of five drift chambers. These drift chambers are approximately 6 feet high and contain over 5,000 wires. ISU constructed and tested these drift chambers that are now in operation in Hall B. The CEBAF Large Acceptance Spectrometer in Hall~B has just began <ins style="font-weight: bold; text-decoration: none;">its </ins>twelve GeV era research program. Preparations for the next phase of experiment E12-06-109, the experiment readiness review, is scheduled for March of 2018 and the experiment is currently schedule to run in the Fall of 2020. As part of this review Co-PI Forest developed a geometrical description of the proposed dual polarized target system and presented that design at the 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan on October 27, 2018. </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;"><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>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125641&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-05T06:15:30Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<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 06:15, 5 November 2018</td>
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<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>==Introduction==</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>==Introduction==</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>==CLAS Polarized Structure Function==</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>==CLAS Polarized Structure Function==</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>Nucleon spin structure functions have been measured using deep inelastic lepton scattering (DIS) for over <del style="font-weight: bold; text-decoration: none;">20 </del>years since the first experiments at the SLAC National Accelerator Laboratory. Interest increased substantially in the 1980s when the EMC collaboration reported that quarks make a small contribution to the overall spin of the proton. This ``spin puzzle'' led to a vigorous theoretical and experimental effort that continues to this day. </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>Nucleon spin structure functions have been measured using deep inelastic lepton scattering (DIS) for over <ins style="font-weight: bold; text-decoration: none;">30 </ins>years since the first experiments at the SLAC National Accelerator Laboratory. Interest increased substantially in the 1980s when the EMC collaboration reported that quarks make a small contribution to the overall spin of the proton. This ``spin puzzle'' led to a vigorous theoretical and experimental effort that continues to this day. </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>Although having a large world data set in a kinematic range that is sensitive to both valence quarks and quark-antiquark pairs, there is a limited amount of data in a region dominated by valence quarks. </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>Although having a large world data set in a kinematic range that is sensitive to both valence quarks and quark-antiquark pairs, there is a limited amount of data in a region dominated by valence quarks. </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>As a result, research on the quark contribution to a nucleon's structure continues unabated. </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>As a result, research on the quark contribution to a nucleon's structure continues unabated. </div></td></tr>
</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125640&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-05T05:39:11Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<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 05:39, 5 November 2018</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l40">Line 40:</td>
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<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>Existing CLAS data from 6 GeV have already made an impact on these fits. The expected data from the proposed experiment at 11~GeV will further reduce the uncertainties of these distributions as seen inf Fige.~\ref{fig:JAM15} from the JAM collaboration~\cite{Jimeniez2014_JAM15}</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>Existing CLAS data from 6 GeV have already made an impact on these fits. The expected data from the proposed experiment at 11~GeV will further reduce the uncertainties of these distributions as seen inf Fige.~\ref{fig:JAM15} from the JAM collaboration~\cite{Jimeniez2014_JAM15}</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>JLab's energy upgrade to 12 GeV will facilitate the above measurements<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>JLab's energy upgrade to 12 GeV will facilitate the above measurements. As a service to Hall~B and to satisfy the needs of experiment E12-06-109, co-PI Forest was responsible for the construction of five drift chambers. These drift chambers are approximately 6 feet high and contain over 5,000 wires. ISU constructed and tested these drift chambers that are now in operation in Hall B. <ins style="font-weight: bold; text-decoration: none;">The CEBAF Large Acceptance Spectrometer in Hall~B has just began twelve GeV era research program. </ins>Preparations for the next phase of experiment E12-06-109, the experiment readiness review, is <ins style="font-weight: bold; text-decoration: none;">scheduled for March of 2018 and the experiment is currently schedule to run in the Fall of 2020</ins>. As part of this <ins style="font-weight: bold; text-decoration: none;">review </ins>Co-PI Forest developed a geometrical description of the proposed dual polarized target system <ins style="font-weight: bold; text-decoration: none;">and </ins>presented that design at the <ins style="font-weight: bold; text-decoration: none;">5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan on October 27, 2018</ins>. </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;">The CEBAF Large Acceptance Spectrometer in Hall~B has just completed its first series of experiments </del>. As a service to Hall~B and to satisfy the needs of experiment E12-06-109, co-PI Forest was responsible for the construction of five drift chambers. These drift chambers are approximately 6 feet high and contain over 5,000 wires. ISU constructed and tested these drift chambers that are now in operation in Hall B. Preparations for the next phase of experiment E12-06-109, the experiment readiness review, is <del style="font-weight: bold; text-decoration: none;">taking place now</del>. As part of this <del style="font-weight: bold; text-decoration: none;">revie </del>Co-PI Forest developed a geometrical description of the proposed dual polarized target system <del style="font-weight: bold; text-decoration: none;">as </del>presented that design at the <del style="font-weight: bold; text-decoration: none;">latest NDP meeting</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;"><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>
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</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125639&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-05T05:25:43Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 05:25, 5 November 2018</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l29">Line 29:</td>
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<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>As a result, research on the quark contribution to a nucleon's structure continues unabated. </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>As a result, research on the quark contribution to a nucleon's structure continues unabated. </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>The 2015 NSAC <del style="font-weight: bold; text-decoration: none;">long range plan </del>identified measurements of the fractional polarization of down quarks in the nucleon ($\frac{\Delta d}{d}$) as providing "important </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 2015 NSAC <ins style="font-weight: bold; text-decoration: none;">Long Range Plan for Nuclear Science </ins>identified measurements of the fractional polarization of down quarks in the nucleon ($\frac{\Delta d}{d}$) as providing "important </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>insight on nucleon structure."</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>insight on nucleon structure."</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>Fig.~\ref{fig:DeltaDoverD} show the data for $\Delta d(x)/d(x)$ from HERMES and JLab measured in a kinematic range where the down quark carried a fraction of the nucleon's momentum ($x_B$) that was less than 0.6. The HERMES measurement used both Inclusive and Semi-Inclusive Deep Inelastic (SIDIS) scattering while the JLab measurements used fits to inclusive electron scattering measurements of polarized structure functions ($g$) and unpolarized structure function ($F$) of the proton, deuteron, and He-3 as well as the ratio of up and down quark distributions from proton and deuteron data.</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>Fig.~\ref{fig:DeltaDoverD} show the data for $\Delta d(x)/d(x)$ from HERMES and JLab measured in a kinematic range where the down quark carried a fraction of the nucleon's momentum ($x_B$) that was less than 0.6. The HERMES measurement used both Inclusive and Semi-Inclusive Deep Inelastic (SIDIS) scattering while the JLab measurements used fits to inclusive electron scattering measurements of polarized structure functions ($g$) and unpolarized structure function ($F$) of the proton, deuteron, and He-3 as well as the ratio of up and down quark distributions from proton and deuteron data.</div></td></tr>
</table>Foretonyhttps://wiki.iac.isu.edu/index.php?title=2018_NSF_Proposal&diff=125638&oldid=prevForetony: /* CLAS Polarized Structure Function */2018-11-05T02:58:40Z<p><span class="autocomment">CLAS Polarized Structure Function</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 02:58, 5 November 2018</td>
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<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>Fig.~\ref{fig:DeltaDoverD} show the data for $\Delta d(x)/d(x)$ from HERMES and JLab measured in a kinematic range where the down quark carried a fraction of the nucleon's momentum ($x_B$) that was less than 0.6. The HERMES measurement used both Inclusive and Semi-Inclusive Deep Inelastic (SIDIS) scattering while the JLab measurements used fits to inclusive electron scattering measurements of polarized structure functions ($g$) and unpolarized structure function ($F$) of the proton, deuteron, and He-3 as well as the ratio of up and down quark distributions from proton and deuteron data.</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>Fig.~\ref{fig:DeltaDoverD} show the data for $\Delta d(x)/d(x)$ from HERMES and JLab measured in a kinematic range where the down quark carried a fraction of the nucleon's momentum ($x_B$) that was less than 0.6. The HERMES measurement used both Inclusive and Semi-Inclusive Deep Inelastic (SIDIS) scattering while the JLab measurements used fits to inclusive electron scattering measurements of polarized structure functions ($g$) and unpolarized structure function ($F$) of the proton, deuteron, and He-3 as well as the ratio of up and down quark distributions from proton and deuteron data.</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>While the constituent quark model (CQM) predicts <del style="font-weight: bold; text-decoration: none;">that </del> $\frac{\Delta d}{d}$ remains negative as $x_B$ approaches unity, perturbative quantum chromodynamics (pQCD) predicts that it will become positive, as shown in a Fig.~\ref{fig:DeltaDoverD}. This large difference between the two predictions now relies on experiment to resolve the disagreement. The current measurements <del style="font-weight: bold; text-decoration: none;">shown </del>in Fig.~\ref{fig:DeltaDoverD} have not shown a clear indication of this predicted sign change as there is a sparsity of data beyond $x_B > 0.5$. <del style="font-weight: bold; text-decoration: none;"> </del>There is a clear need to perform measurements above $x_B$ of 0.5 in order to evaluate the veracity of the pQCD and CQM predictions.</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>While <ins style="font-weight: bold; text-decoration: none;">predictions of $\Deltad(x)/d(x)$ using </ins>the constituent quark model (CQM)<ins style="font-weight: bold; text-decoration: none;">~\site{Isgur1999} ~\cite{Cloet20015}, and the Dyson-Swinger equations~\cite{Roberts2013} </ins>predicts $\frac{\Delta d}{d}$ remains negative as $x_B$ approaches unity, perturbative quantum chromodynamics (pQCD) predicts that it will become positive, as shown in a Fig.~\ref{fig:DeltaDoverD}. This large difference between the two predictions now relies on experiment to resolve the disagreement. The current measurements in Fig.~\ref{fig:DeltaDoverD} have not shown a clear indication of this predicted sign change as there is a sparsity of data beyond $x_B > 0.5$. There is a clear need to perform measurements above $x_B$ of 0.5 in order to evaluate the veracity of the pQCD and CQM predictions.</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>One of the goals of experiment PR12-06-109, in JLab's Hall B, is to measure $\frac{\Delta d}{d}$ above $x_B$ of 0.5. Fig.~\ref{fig:DeltaDoverD} illustrates the precision that may be achieved using the CLAS12 apparatus. In particular, the measurement at $x_B$ of 0.7 should distinguish between the two prediction at the 2$\sigma$ level. </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>One of the goals of experiment PR12-06-109, in JLab's Hall B, is to measure $\frac{\Delta d}{d}$ above $x_B$ of 0.5. Fig.~\ref{fig:DeltaDoverD} illustrates the precision that may be achieved using the CLAS12 apparatus. In particular, the measurement at $x_B$ of 0.7 should distinguish between the two prediction at the 2$\sigma$ level. </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 comprehensive data set to be collected by experiment PR12-06-109 (co-PI Forest) will also contribute substantially to our knowledge of polarized parton distribution functions for all quark flavors and even the polarized gluon distribution $\Delta g$, which is also being pursued at Relativistic Heavy Ion Collider (RHIC). </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 comprehensive data set to be collected by experiment PR12-06-109 (co-PI Forest) will also contribute substantially to our knowledge of polarized parton distribution functions for all quark flavors and even the polarized gluon distribution $\Delta g$, which is also being pursued at Relativistic Heavy Ion Collider (RHIC). </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>Through Next-to-Leading Order (NLO) analysis of the world data on inclusive DIS (using the DGLAP evolution equations), one can constrain these distribution functions and their integrals. </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>Through Next-to-Leading Order (NLO) analysis of the world data on inclusive DIS (using the DGLAP evolution equations), one can constrain these distribution functions and their integrals. </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>Existing CLAS data from 6 GeV have already made an impact on these fits. The expected data from the proposed experiment at 11~GeV will further reduce the uncertainties of these distributions. </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>Existing CLAS data from 6 GeV have already made an impact on these fits. The expected data from the proposed experiment at 11~GeV will further reduce the uncertainties of these distributions <ins style="font-weight: bold; text-decoration: none;">as seen inf Fige</ins>.<ins style="font-weight: bold; text-decoration: none;">~\ref{fig:JAM15} from the JAM collaboration~\cite{Jimeniez2014_JAM15}</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;"><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>JLab's energy upgrade to 12 GeV will facilitate the above measurements. </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>JLab's energy upgrade to 12 GeV will facilitate the above measurements. </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 CEBAF Large Acceptance Spectrometer in Hall~B <del style="font-weight: bold; text-decoration: none;">is currently undergoing an upgrade </del>of <del style="font-weight: bold; text-decoration: none;">its detector systems to accommodate the increased energy as well</del>. As a service to Hall~B and to satisfy the needs of experiment <del style="font-weight: bold; text-decoration: none;">PR12</del>-06-109, co-PI Forest <del style="font-weight: bold; text-decoration: none;">has become </del>responsible for the construction of five drift chambers. These drift chambers are approximately 6 feet high and contain over 5,000 wires. ISU <del style="font-weight: bold; text-decoration: none;">has successfully </del>constructed and tested <del style="font-weight: bold; text-decoration: none;">one chamber with two more nearing completion</del>. <del style="font-weight: bold; text-decoration: none;">The ISU clean room being used </del>for <del style="font-weight: bold; text-decoration: none;">this work </del>is <del style="font-weight: bold; text-decoration: none;">shown in Fig</del>.<del style="font-weight: bold; text-decoration: none;">~\ref{delqJLab}</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>The CEBAF Large Acceptance Spectrometer in Hall~B <ins style="font-weight: bold; text-decoration: none;">has just completed its first series </ins>of <ins style="font-weight: bold; text-decoration: none;">experiments </ins>. As a service to Hall~B and to satisfy the needs of experiment <ins style="font-weight: bold; text-decoration: none;">E12</ins>-06-109, co-PI Forest <ins style="font-weight: bold; text-decoration: none;">was </ins>responsible for the construction of five drift chambers. These drift chambers are approximately 6 feet high and contain over 5,000 wires. ISU constructed and tested <ins style="font-weight: bold; text-decoration: none;">these drift chambers that are now in operation in Hall B</ins>. <ins style="font-weight: bold; text-decoration: none;">Preparations </ins>for <ins style="font-weight: bold; text-decoration: none;">the next phase of experiment E12-06-109, the experiment readiness review, </ins>is <ins style="font-weight: bold; text-decoration: none;">taking place now</ins>. <ins style="font-weight: bold; text-decoration: none;"> As part of this revie Co-PI Forest developed a geometrical description of the proposed dual polarized target system as presented that design at the latest NDP meeting</ins>. </div></td></tr>
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</table>Foretony