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| − | == General Information == | + | == General information == |
| | This article will cover all things Hall-C Moller. currently, this includes all of the Qweak information. Information for past experiments can be found in the experiments section. This page is currently under construction, so please come back soon for more, or update me. | | This article will cover all things Hall-C Moller. currently, this includes all of the Qweak information. Information for past experiments can be found in the experiments section. This page is currently under construction, so please come back soon for more, or update me. |
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| | [[Image:Moller_setup_Nov_14_2010.png|600px]] | | [[Image:Moller_setup_Nov_14_2010.png|600px]] |
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| − | ==Moller Commissioning - Nov. 14, 2010== | + | ==Hardware configuration & changes== |
| − | | + | Up until last run in December (date tbd)we used BCM 2 with gain from Kat's Faraday cup measurements. |
| − | Initial Moller commissioning was on on November 14th, 2010. Polarizations up to 89% occurred. It consisted mainly from runs 476-490. Several targets, currents, and pre-scales were used. Collimator 5 was also removed for several runs to determine if scraping occurred. The following is a run summary:
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| − | | |
| − | <pre>
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| − | Run target current(uA) Camac prescale Polarization (%) Comments
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| − | 477 1um 0.2 100 89.99+/-0.88
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| − | 478 1um 0.2 100 88.17+/-0.89
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| − | 479 1um 1.0 100 NA junk
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| − | 480 1um 1.0 1000 87.20+/-0.69
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| − | 481 1um 1.0 1000 88.91+/-0.71
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| − | 482 4um 0.2 1000 89.05+/-0.77 collimator 5 out
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| − | 483 4um 0.2 1000 89.61+/-0.80 collimator 5 out
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| − | 484 no tgt 1.0 1000 NA collimator 5 out
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| − | 485 no tgt 1.0 1000 NA collimator 5 in
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| − | 486 1um 0.6 1000 88.68+/-0.80 collimator 5 in
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| − | 487 1um 0.6 1000 87.95+/-0.82 solenoid at 3.5 T, collimator 5 in
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| − | 488 1um 0.6 1000 89.12+/-0.90 solenoid at 3.5 T, collimator 5 in
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| − | 489 1um 0.6 1000 89.69+/-0.80 solenoid at 3.5 T, collimator 5 in, fast raster 2x
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| − | 490 1um 0.6 1000 89.39+/-0.81 solenoid at 3.5 T, collimator 5 in, fast raster 2x2
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| − | 491 1um 0.2 1 NA solenoid at 3.5 T, collimator 5 in, fast raster 2x2
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| − | </pre>
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| − | | |
| − | ==Moller spin dance==
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| − | The initial Qweak Moller spin dance occurred November 23, 2010. Originally scheduled to coincide with Hall A, beam tune issues (on their end only) prevented a joint study.
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| − | Test setup: IHWP=OUT, QE=0.35%, Hallc:p 1159.66 MeV +/- 0.03. Solenoid at 3.5T, with 1 um foil.
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| − | The current was adjusted using the laser attenuator, slit was wide open. Quoted polarizations are
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| − | from the Dave G. scaler-bank-3-only analysis.
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| − | <pre>
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| − | Run Wein Polarization Comments
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| − | 508 -0.1 40.04 +/- 1.23 200 nA
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| − | 509 -0.1 40.05 +/- 1.88 1.05 uA
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| − | 510 -0.1 40.40 +/- 1.03 1 uA
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| − | 511 -0.1 40.13 +/- 0.68 0.9 uA
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| − | 512 -0.1 40.19 +/- 0.70 0.9 uA
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| − | 513 -0.1 40.13 +/- 0.70 0.9 uA
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| − | 514 -0.1 40.14 +/- 0.65 0.57 uA
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| − | 515 -0.1 N/A (junk) Hall C laser off - no Hall A bleedthrough
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| − | 517 +29.0 -2.75 +/- 0.65 0.9 uA
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| − | 518 +29.0 N/A Hall C laser off
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| − | 519 +29.0 -3.70 +/- 0.69 0.9 uA
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| − | 520 +29.0 -3.48 +/- 0.68 0.9 uA
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| − | | |
| − | 521 -31.0 75.85 +/- 0.88 0.9 uA
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| − | 522 -31.0 76.81 +/- 0.69 0.9 uA
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| − | 523 -31.0 75.61 +/- 0.69 0.9 uA
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| − | 524 -31.0 75.50 +/- 1.25 0.9 uA
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| − | 525 -31.0 74.54 +/- 0.96 0.9 uA
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| − | 526 -31.0 75.37 +/- 0.67 0.9 uA
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| − | | |
| − | 527 -75.0 87.89 +/- 0.70 0.9 uA
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| − | 528 -75.0 87.63 +/- 0.69 0.9 uA
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| − | 529 -75.0 86.69 +/- 0.69 0.9 uA
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| − | 530 -75.0 86.83 +/- 0.79 0.9 uA
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| − | | |
| − | 531 -63.20 88.64 +/- 0.74 0.9 uA
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| − | 532 -63.20 89.65 +/- 1.12 0.9 uA
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| − | 533 -63.20 90.32 +/- 0.69 0.9 uA
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| − | 534 -63.20 89.51 +/- 0.68 0.9 uA
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| − | 535 -63.20 89.73 +/- 1.90 0.9 uA
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| − | 536 -63.20 90.04 +/- 0.91 0.9 uA
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| − | </pre>
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| − | | |
| − | The ideal horizontal wein angle was calculated to be -63.2 degrees. The measured polarization value at this wein was 89.62 +/- 0.35 (stat)%. Below the fit of polarization vs. Wein angle.
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| − | | |
| − | [[Image:Pol_vs_wein_dance1.gif|600px]]
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| − | | |
| − | The original hclog result entries are #208285 and #208394.
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| − | | |
| − | | |
| − | ==Moller test summaries==
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| − | | |
| − | ===Jan. 21, 2011===
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| − | This was our first straight Moller measurement after the holiday down. Only a series of simple measurements were taken at varying currents were taken, no systematic studies. It was also hoped we could use this data to (eventually) calibrate BCM 17. Notice also the backgrounds remain consistent and reproducible from the December measurements.
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| − | Conditions: INHWP: In, QE=0.32%, HALLC:p=1159.82 MeV. Collimator 5 was out.
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| − | <pre>
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| − | Run Polarization Note
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| − | 686 -90.46 +/- 0.52 1 uA
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| − | 687 -91.36 +/- 0.69 1.5 uA
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| − | 688 -90.60 +/- 0.67 2.0 uA
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| − | 689 -91.64 +/- 0.99 1.5 uA
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| − | 690 -88.56 +/- 1.36 0.5 uA - bad beam position
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| − | 691 -91.28 +/- 1.43 0.5 uA
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| − | </pre>
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| − | Excluding run 690, the average polarization is -90.86+/-0.32%.
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| | == Experiments == | | == Experiments == |
General information
This article will cover all things Hall-C Moller. currently, this includes all of the Qweak information. Information for past experiments can be found in the experiments section. This page is currently under construction, so please come back soon for more, or update me.
Documentation and references
The following are useful references:
The following is a plot showing a good tune of the apparatus. It was taken Nov. 14, 2010 from run 475, with conditions: hallc:p is 1160.09 MeV, with a 1um target.
Also, a screen shot of the moller medm screen. Note the Q1 and Q2 currents, and the location of the collimators. This data may change, but should be accurate for the near term.
Hardware configuration & changes
Up until last run in December (date tbd)we used BCM 2 with gain from Kat's Faraday cup measurements.
Experiments
- Qweak
- Qweak Moller How-to (coming soon!)
