Moeller Polarimeter Raw Results Archives 2011

TILTED (old) Moller Target

January 2011. Old (tilted) Moller target has been restored on the beam line.


January 27, 2011. Tilted Moller target alignment. Calculated foil angle is 19.95deg.


February 8, 2011. Power supply of the third Moller quad has been replased due to noise, see elog entry 1567253 .
S. Wood: test results for Moller quads power supply are in table.

E08-008: D-Threshold
Exclusive Study of Deuteron Electrodisintegration near Threshold

• 18 February 2011 9:00 - 18:00. J. Zhang, R. Pomatsalyuk, O.Glamazdin

  The beam energy is 3354.8MeV(accel), 549.0MeV(linac), 61.76MeV(injector).
  Injector angle is -62.40^o (+25.8^o including flipper), the 1/2 wave plate was OUT.
  Fast raster was ON. Beam was straight. Moller energy lock was used. Beam energy was unstable. Beam energy fluctuation correction is needed.
  Moller FSD problem was fixed(see elog 1569033 ).
  Hall C Moller measurement result see hclog 220868 ).
  12:45-13:30 Controlled access to fix moller rack power problem (see elog 347502 )
  Runs 14985-14993: Moller Quad1 scan. There is a discrepancy between GEANT and measurement.
  Runs 14994-15000: Moller Quad3 scan. No difference between GEANT and measurement.
  Runs 15021-15023: beam charge asymmetry test.
  

  The theta acceptance is about +/-14^o and the mean analyzing power is 0.7543.
  The target angle is 19.95^o. The error is statistical only. BPM01Y position is included
  Cor.Pol - Polarization corrected on the beam energy fluctuation (HALLA:p)

  Runs	Target	T.Pos.	Encoder	BOP	Polarization %	Cor.Polar. %	Chi2	Comments
  15001-15006	5	-1.1	1.367/1.013	8.0	-83.49+/-0.36	-84.06	1.8	B.cur=0.5uA
  15007-15010	4	-1.1	1.365/1.636	8.0	-81.56+/-0.37	-82.11	0.8	B.cur=0.5uA
  15011-15016	3	-1.1	1.368/2.232	8.0	-80.78+/-0.21	-81.38	8.2	B.cur=0.4uA
  15017-15020	2	-1.1	1.365/2.865	8.0	-80.52+/-0.26	-79.90	0.6	B.cur=0.25uA
  15024-15025	2	0.0	1.770/2.933	8.0	-82.17+/-0.38	-81.74	0.7	B.cur=0.25uA
  15026-15027	4	0.0	1.770/1.675	8.0	-80.92+/-0.51	-81.67	0.6	B.cur=0.5uA
  15028-15029	5	0.0	1.768/1.043	8.0	-83.38+/-0.54	-83.99	0.1	B.cur=0.5uA
  Average	5	-	-	-	-83.45+/-0.31	-84.04	1.4	-
  Average	4	-	-	-	-81.33+/-0.30	-82.11	0.8	-
  Average	2	-	-	-	-81.06+/-0.22	-80.50	3.7	-
  Average	2-5	-	-	-	-81.69+/-0.13	-81.64	6.5	-

  The Moller Log Book scan is given here .
  The table with detailed information is given here and here.
  For additional information see halog entry 347515 .
  For the beam energy fluctuation see plot1 .
  The final results:
  Pz=(-81.64 +/- 0.13(stat) +/- 2.0(syst))%
  The plots are given here .
  

• 19 December 2011 14:20 - 22:30. R. Pomatsalyuk, O.Glamazdin

  The Moller Polarimeter commissioning. The beam energy is 1721.3MeV(accel)
  Injector angle is 90.00^o -92.057^o(Flipper), 0.0^o(Wien), the 1/2 wave plate was IN.
  Fast raster was OFF. Beam was straight. Hall C energy lock was used.
  Moller FSD problem was fixed(see elog 1655853 ).
  Runs 15040-15046 Helicity 30Hz, 8 Windows, Quartet Runs 15040-15045: beam charge asymmetry test.
  Beam charge asymmetry was very unstable and the peaks were very wides (see plots below).
  Run 15075 Beam charge asymmetry is back to normal (0.00071).
  Runs 15048-15087 Helicity 960Hz
  Runs 15050-15061: Moller Quad1 scan.
  Runs 15064-15072: Moller Quad3 scan.
  

  The theta acceptance is about +/-14^o and the mean analyzing power is 0.7528.
  The target angle is 19.95^o. The error is statistical only. BPM01Y position is included

  Runs	Target	Encoder	BOP	Polarization %	Comments
  15073-15074	4	-	8.0	58.73+/-0.42	B.cur=0.3uA
  15075-15076	4	-	8.0	62.46+/-0.29	B.cur=0.5uA
  15077-15078	4	-	8.0	62.25+/-0.24	B.cur=0.7uA
  15079-15081	4	-	8.0	62.83+/-0.21	B.cur=0.7uA double scan
  15082-15087	2	-	8.0	62.08+/-0.19	B.cur=0.1uA

  The Moller Log Book scan is given here .
  The table with detailed information is given here and here.
  Plots with the beam charge asymmetry measurement results are shown below:

  • Run 15040,
    
  • Run 15042 ,
    
  • Run 15045 ,
    
  • Run 15046 ,
    
  • Runs 15040-15046 ,
    
  • Runs 15063-15070 ,
    
  
  The table with detailed information for FADC DAQ is given here and plots:
  • target #4 with different currents,
    
  • target #2 ,
    
  • target #4 vs current ,
    
  • target #4 vs current and old DAQ .
  
  For additional information see halog entry 360950 .