Difference between revisions of "Moller Polarimeter"

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== General Information ==
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== General information ==
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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.
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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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== Documentation ==
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== Documentation and references ==
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The following is a plot showing 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.
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Procedures:
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* [[How to Take a Moller Run]]
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* [https://hallcweb.jlab.org/polwiki/images/8/8e/Hallc_moller_osp.pdf Moller OSP]
  
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[[Image:Moller_tune_Nov_14_2010.png]]
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The following are useful references:
  
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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.
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*[[Sign of the beam polarization]]
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* Moller NIM Article ([http://www.sciencedirect.com/science/article/pii/S0168900201001978 NIM A Server] or [http://arxiv.org/abs/nucl-ex/9910013 arXiv])
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* Matthias Loppacher's thesis ([https://hallcweb.jlab.org/polwiki/images/5/54/Loppacher_moeller_thesis.pdf pdf])
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* Sarah Phillips' note on g0 Forward Angle Polarimetry ([https://hallcweb.jlab.org/polwiki/images/9/91/G0_polarimetry.pdf pdf])
  
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[[Image:Moller_setup_Nov_14_2010.png|600px]]
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Hardware related information (under construction)
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* [[Collimators]]
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* [[Magnets]]
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* [[Targets]]
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* [[DAQ, Trigger, Slow controls]]
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* [[Detectors]]
  
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==Moller Commissioning - Nov. 14, 2010==
 
  
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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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The following is a plot showing a good tune of the apparatus. It was taken Jan 30, 2011 from run 700, with conditions: hallc:p is 1159 MeV, with a 1um target.
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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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[[Image:Moller_plot_jan30_2011.png]]
  
 
== Experiments ==
 
== Experiments ==
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**[http://www.jlab.org/~gaskelld/moller/sane_moller_sbys.ps Sane Moller How-to]
 
**[http://www.jlab.org/~gaskelld/moller/sane_moller_sbys.ps Sane Moller How-to]
  
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*[https://qweak.jlab.org/wiki/index.php/Main_Page Qweak]
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*[[Moller_Polarimeter/Qweak|Qweak]]
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**Qweak Moller How-to (coming soon!}
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**[http://www.jlab.org/~magee/moller/qweak_moller_sbys.pdf Qweak Moller How-To] (''pdf'')
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**[http://www.jlab.org/~magee/moller/qweak_moller_sbys.tex Qweak Moller How-To] (''tex file'')
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*[[Moller_Polarimeter/A1n/d2n|A1n/d2n]]
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*[[Moller_Polarimeter/NPS|NPS]]

Latest revision as of 12:53, 16 August 2023

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

Procedures:

The following are useful references:

Hardware related information (under construction)


The following is a plot showing a good tune of the apparatus. It was taken Jan 30, 2011 from run 700, with conditions: hallc:p is 1159 MeV, with a 1um target.

Moller plot jan30 2011.png

Experiments

Retrieved from "https://hallcweb-2024.jlab.org/polwiki/index.php?title=Moller_Polarimeter&oldid=1770"