Difference between revisions of "September 9, 2011"
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[https://wiki.iac.isu.edu/index.php/Sept_PhotFisRun_44MeV_2011#Log_eBook go back] | [https://wiki.iac.isu.edu/index.php/Sept_PhotFisRun_44MeV_2011#Log_eBook go back] | ||
− | ==summary what was done== | + | ==summary what was been done== |
{| border="1" cellspacing="0" style="text-align: center; width: 1000px " | {| border="1" cellspacing="0" style="text-align: center; width: 1000px " | ||
− | ! scope="col" width=" | + | ! scope="col" width="8%" | Run # |
− | ! scope="col" width=" | + | ! scope="col" width="8%" | Beam |
− | ! scope="col" width=" | + | ! scope="col" width="8%" | Dump magnet |
− | ! scope="col" width=" | + | ! scope="col" width="8%" | Collimator |
− | ! scope="col" width=" | + | ! scope="col" width="8%" | Radiator 10 um Al |
− | ! scope="col" width=" | + | ! scope="col" width="8%" | Target |
− | ! scope="col" width=" | + | ! scope="col" width="60%" | Comments |
|- | |- | ||
− | |2339||Up 2 mm||In ||Open ||Up 2 mm||No | + | |2339||Up 2 mm||In ||Open ||Up 2 mm||No |
+ | |align="left"|R(upstream) = 2648/35092 = 0.075 e+/pulse,<br>R(downstream) = 3191/35092 = 0.091 e+/pulse | ||
|- | |- | ||
− | |2341||Up 2 mm||In ||Open ||Out||No | + | |2341||Up 2 mm||In ||Open ||Out||No |
+ | |align="left"|R(upstream) = 1088/35494 = 0.031 e+/pulse,<br> R(downstream) = 1328/35494 = 0.037 e+/pulse. | ||
+ | <span style="color:red">About 59% of photons are coming from the radiator. Bad</span> | ||
|- | |- | ||
− | |2342||Down 2 mm||In ||Open ||Out||No | + | |2342||Down 2 mm||In ||Open ||Out||No |
+ | |align="left"|R(upstream) = 1586/36678 = 0.043 e+/pulse,<br>R(downstream) = 1888/36678 = 0.051 e+/pulse. | ||
|- | |- | ||
− | |2343||Down 2 mm||In ||Open ||Down 2 mm||No | + | |2343||Down 2 mm||In ||Open ||Down 2 mm||No |
+ | |align="left"|R(upstream) = 2232/35488 = 0.063 e+/pulse. | ||
+ | <span style="color:red">About 32% of photons are coming from the radiator. Bad</span> | ||
|- | |- | ||
− | |2344||Centered||In ||Open ||Centered||No | + | |2344||Centered||In ||Open ||Centered||No |
+ | |align="left"|R(upstream) = 2683/35095 = 0.076 e+/pulse. | ||
|- | |- | ||
− | |2345||Centered||In ||Open ||Out||No | + | |2345||Centered||In ||Open ||Out||No |
+ | |align="left"|R(upstream) = 1039/35094 = 0.029 e+/pulse. | ||
+ | <span style="color:red">About 62% of photons are coming from the radiator. Bad</span> | ||
|- | |- | ||
− | |2346||Centered||In ||Open ||Out||No | + | |2346||Centered||In ||Open ||Out||No |
+ | |align="left"|R(upstream) = 1286/35885 = 0.036 e+/pulse. | ||
+ | Improved shielding around dump. | ||
|- | |- | ||
− | |colspan="6"| ||align="left"|Based on the previous results the beam is total crap, so beam | + | |colspan="6"| ||align="left"|<span style="color:green">Based on the previous results the beam is total crap, so beam tuned up.</span> |
|- | |- | ||
− | | | + | |2349||Centered||In ||Open ||Out||No |
+ | |align="left"|R(upstream) = 404/35489 = 0.011 e+/pulse. | ||
+ | |- | ||
+ | |2350||Centered||In ||Open ||Out||No | ||
+ | |align="left"|R(upstream) = 428/35093 = 0.012 e+/pulse. | ||
+ | Additional shielding around the vacuum window of the beam pipe. | ||
+ | |- | ||
+ | |2351||Centered||In ||Open ||Centered||No | ||
+ | |align="left"|R(upstream) = 1314/35094 = 0.037 e+/pulse. | ||
+ | <span style="color:red">About 68% of photons are coming from the radiator. Still bad.</span> | ||
+ | Additional shielding around the vacuum window of the beam pipe is removed. | ||
+ | |- | ||
+ | |2352||Up 2 mm||In ||Open ||Up 2 mm||D2O bottle ||align="left"|Production run. | ||
+ | |- | ||
+ | |2353||Up 2 mm||In ||Open ||Out||D2O bottle ||align="left"|background check<br> | ||
+ | threshold @A22 lowered to -100 mV | ||
+ | |- | ||
+ | |2354||Up 2 mm||In ||Open ||Up 2 mm||DU plate | ||
+ | |align="left"|R(upstream) = 4228/188008 = 0.022 e+/pulse,<br>R(downstream) = 5169/188008 = 0.027 e+/pulse | ||
+ | Production run. | ||
+ | |- | ||
+ | |2355||Up 2 mm||In ||Open ||Out ||DU plate | ||
+ | |align="left"|R(upstream) = 766/44747 = 0.017 e+/pulse,<br>R(downstream) = 962/44747 = 0.021 e+/pulse | ||
+ | <span style="color:red">background check: about the same as w/ radiator in. Bad.</span><br> Threshold @A20 lowered to -100 mV | ||
|- | |- | ||
|} | |} | ||
== Beam Realignment == | == Beam Realignment == | ||
− | + | Screen shot using Phosphorous screen | |
[[File:9_9_11_10am.jpg | 500px]] | [[File:9_9_11_10am.jpg | 500px]] | ||
− | + | Electron beam on glass | |
[[File:e-glass.jpg | 500px]] | [[File:e-glass.jpg | 500px]] | ||
+ | |||
+ | 12pm upstream view screen | ||
+ | |||
+ | [[File:12pm_upstream.jpg | 500px]] | ||
+ | |||
+ | 12pm downstream view screen | ||
+ | |||
+ | [[File:12pm_downstream.jpg | 500px]] | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | [https://wiki.iac.isu.edu/index.php/September_9,_2011 go up] |
Latest revision as of 16:57, 16 September 2011
summary what was been done
Run # | Beam | Dump magnet | Collimator | Radiator 10 um Al | Target | Comments |
---|---|---|---|---|---|---|
2339 | Up 2 mm | In | Open | Up 2 mm | No | R(upstream) = 2648/35092 = 0.075 e+/pulse, R(downstream) = 3191/35092 = 0.091 e+/pulse |
2341 | Up 2 mm | In | Open | Out | No | R(upstream) = 1088/35494 = 0.031 e+/pulse, R(downstream) = 1328/35494 = 0.037 e+/pulse. About 59% of photons are coming from the radiator. Bad |
2342 | Down 2 mm | In | Open | Out | No | R(upstream) = 1586/36678 = 0.043 e+/pulse, R(downstream) = 1888/36678 = 0.051 e+/pulse. |
2343 | Down 2 mm | In | Open | Down 2 mm | No | R(upstream) = 2232/35488 = 0.063 e+/pulse.
About 32% of photons are coming from the radiator. Bad |
2344 | Centered | In | Open | Centered | No | R(upstream) = 2683/35095 = 0.076 e+/pulse. |
2345 | Centered | In | Open | Out | No | R(upstream) = 1039/35094 = 0.029 e+/pulse.
About 62% of photons are coming from the radiator. Bad |
2346 | Centered | In | Open | Out | No | R(upstream) = 1286/35885 = 0.036 e+/pulse.
Improved shielding around dump. |
Based on the previous results the beam is total crap, so beam tuned up. | ||||||
2349 | Centered | In | Open | Out | No | R(upstream) = 404/35489 = 0.011 e+/pulse. |
2350 | Centered | In | Open | Out | No | R(upstream) = 428/35093 = 0.012 e+/pulse.
Additional shielding around the vacuum window of the beam pipe. |
2351 | Centered | In | Open | Centered | No | R(upstream) = 1314/35094 = 0.037 e+/pulse.
About 68% of photons are coming from the radiator. Still bad. Additional shielding around the vacuum window of the beam pipe is removed. |
2352 | Up 2 mm | In | Open | Up 2 mm | D2O bottle | Production run. |
2353 | Up 2 mm | In | Open | Out | D2O bottle | background check threshold @A22 lowered to -100 mV |
2354 | Up 2 mm | In | Open | Up 2 mm | DU plate | R(upstream) = 4228/188008 = 0.022 e+/pulse, R(downstream) = 5169/188008 = 0.027 e+/pulse Production run. |
2355 | Up 2 mm | In | Open | Out | DU plate | R(upstream) = 766/44747 = 0.017 e+/pulse, R(downstream) = 962/44747 = 0.021 e+/pulse background check: about the same as w/ radiator in. Bad. |
Beam Realignment
Screen shot using Phosphorous screen
Electron beam on glass
12pm upstream view screen
12pm downstream view screen