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User name Spayde
Log entry time 21:55:22 on December 10,2002
Entry number 53812
Followups:
keyword=Moller Commissioning II
Waiting for beam. MCC is working on combined optics tune.
Increase CAMAC event prescale factor from 2E5 to 2E7.
Run 44535: Run with no target for no good reason.
Waiting for MCC to complete combined optics tuning. Tonight we will be running with the prebuncher off in support of a testing program for the injector group/MCC. This means that the beam we will be getting will not be true G0 beam. However, I do not think that most of the Moller program for this evening requires true G0 beam so this should not be a huge burden.
Inserting 4 micron Moller target (position 3). Beam current is 1.5 microA (had to go higher in current in order to get a reading on 3C16). Prebuncher is off.
Injector Settings:
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.30525
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.51276
Laser Phase measured 44.8908
Laser Phase setpoint -29.9
Rotatable hwp 1060
Wien Angle -27.1989
Run 44536: Short run to check magnet settings.
Run 44537: P_b = -74.28 +/- 0.92% (all polarization measurements are with accidentals removed)
Run 44538: P_b = -74.21 +/- 0.74%
Average P_b = -74.24 +/- 0.58%
Effect of Leakage Beam on Polarization (Part I)
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Requested MCC to turn on Hall A laser. Will use attenuator setting that would yield 100 microA in Hall A (value is 400).
Injector Settings:
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.30525
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.4514
Laser Phase measured 45.0862
Laser Phase setpoint -29.9
Rotatable hwp 1060
Wien Angle -27.1989
Run 44539: P_b = -73.18 +/- 0.91%
Run 44540: P_b = -73.19 +/- 0.64%
Run 44541: P_b = -74.58 +/- 0.93%
Average P_b = -73.52 +/- 0.46%
Ask MCC for Hall C laser off
Injector Settings:
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.30525
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current -0.0910084
Laser Phase measured 44.8513
Laser Phase setpoint -29.9
Rotatable hwp 1060
Wien Angle -27.1989
Ask MCC for Hall A laser off
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current -0.10397
Laser Phase measured 44.9687
Laser Phase setpoint -29.9
Rotatable hwp 1060
Wien Angle -27.1989
Difference in currents suggests 13.0 nA of Hall A bleed through. MCC reports that Hall A beam polarization is -35%.
Beginning study of G0 laser phase and beam polarization
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Ask MCC to turn Hall C laser back on and reduce G0 laser phase by 0.25 degrees.
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.30525
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.38267
Laser Phase measured 45.0941
Laser Phase setpoint -30.15
Rotatable hwp 1060
Wien Angle -27.1989
Run 44542: P_b = -75.74 +/- 0.64%
Run 44543: P_b = -75.48 +/- 0.61%
Average P_b = -75.60 +/- 0.44%
Ask MCC to reduce laser phase by another 0.25 deg for a total of -0.5 deg from optimal phase.
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.30145
Laser Phase measured 45.2036
Laser Phase setpoint -30.3
Rotatable hwp 1060
Wien Angle -27.1989
Run 44544: P_b = -75.18 +/- 0.65%
Run 44545: P_b = -75.26 +/- 0.65%
Average P_b = -75.22 +/- 0.46%
Asked MCC to increase laser phase by 0.75 degrees, or + 0.25 degrees from optimal position. Actually, just realized that only made it to -0.4 degrees on the last step so called MCC back and asked them to go +0.65, or +0.25 degrees from optimal.
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.65362
Laser Phase measured 44.8671
Laser Phase setpoint -29.65
Rotatable hwp 1060
Wien Angle -27.1989
Run 44546: P_b = -76.36 +/- 0.69%
Run 44547: P_b = -75.56 +/- 0.64%
Average P_b = -75.93 +/- 0.47%
Asked MCC to increase laser phase by +0.25 deg for a total of +0.5 deg.
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.66293
Laser Phase measured 45.242
Laser Phase setpoint -29.4
Rotatable hwp 1060
Wien Angle -27.1989
Run 44548: P_b = -75.58 +/- 0.64%
Run 44549: P_b = -75.04 +/- 0.64%
Average P_b = -75.31 +/- 0.45%
Asked MCC to set the laser phase back to the optimal position.
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.56337
Laser Phase measured 44.8202
Laser Phase setpoint -29.9
Rotatable hwp 1060
Wien Angle -27.1989
Run 44550: P_b = -74.73 +/- 0.65%
Run 44551: P_b = -75.63 +/- 0.83%
Average P_b =
Asked MCC to set G0 laser phase to -0.5 deg (pick up the point I missed before).
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.22278
Laser Phase measured 45.2355
Laser Phase setpoint -30.4
Rotatable hwp 1060
Wien Angle -27.1989
Run 44552: P_b = -75.36 +/- 0.65%
Run 44553: P_b = -73.72 +/- 0.65%
Average P_b = -74.54 +/- 0.46%
Asked MCC to go back to optimal G0 laser phase setting (-29.9 deg).
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.30525
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.30897
Laser Phase measured 44.8435
Laser Phase setpoint -30.3
Rotatable hwp 1060
Wien Angle -27.1989
Run 44554: P_b = -74.24 +/- 0.97%
Laser phase had been set to -30.3, not -29.9. Asked MCC to reset laser phase.
Global Laser Phase 65
Half Wave Plate 0
Hall A current -0.42735
Hall C Laser att. 290
Hall C Slit pos 18
Hall C current 1.58765
Laser Phase measured 45.1096
Laser Phase setpoint -29.9
Rotatable hwp 1060
Wien Angle -27.1989
Run 44555: P_b = -76.07 +/- 0.82%
Run 44556: P_b = -75.38 +/- 0.63%
Average P_b = -75.64 +/- 0.50%
End Laser Phase Study