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User name O.Glamazdin
Log entry time 15:55:11 on October 27, 2010
Entry number 337023
keyword=Moller resultsMoller results on October 27, 9:00 - 15:30
- Crew: Jixie, Roman, Sasha,
- Wien filter angle is 29.2°
- The raster was ON 4.1*3MCC units.
- The half wave plate was IN.
- Beam was going through Compton chicane.
- Moller detector HV adjustment for 4 passes energy was done.
- Helicity frequency: 943.4Hz, pattern: quartet, delay: 8 windows.
- Moller energy lock was used. At the Moller measurement time the beam energy was about 4457.0MeV vs. 4455.7MeV for DVCS. Beam energy was unstable (see strip chart). Correction on the beam energy fluctuation has to be done
- We had a problem with Moller power supply. It has to be investigated.
- 13:55 After changing Moller target from target 3 to target 4 and the beam current from 3uA to 1.3uA we lost information about the beam position on BPM 1H01 (see strip chart).
| # | Wien angle | beam | runs | target | Pbeam% | comments |
|---|---|---|---|---|---|---|
| 1 | 29.2° | 3.0 µA | 14899-14907 | 1 | 73.10±0.3 | +3.9T |
| 2 | 29.2° | 3.0 µA | 14908-14911 | 2 | 73.40±0.25 | +3.9T |
| 3 | 29.2° | 3.0 µA | 14912-14915 | 3 | 73.62±0.25 | +3.9T |
| 4 | 29.2° | 1.3 µA | 14916-14919 | 4 | 72.41±0.2 | +3.9T |
| 5 | 29.2° | 3.0 µA | 14920-14921 | 3 | 73.21±0.41 | +3.9T |
| 6 | 29.2° | 3.0 µA | 14922-14925 | 3 | 73.42±0.23 | +3.0T |
| Average | 29.2° | - | 14899-14919 | 1-4 | 73.05±0.11 | - |
A copy of this log entry has been emailed to: gen@jlab.org
Figure 1
