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User name O.Glamazdin
Log entry time 12:18:30 on November 12, 2009
Entry number 299208
keyword=Preliminary Moller resultsMoller results on November 12 9:00 - 11:30
- Crew: O.Glamazdin, A.Sasha, FADC team
- Wien filter angle is 74.73°
- The raster was ON. The half wave plate was OUT.
- Beam tuning took ~1 hour.
- Beam orbit was unstable.
- Beam current was 1uAmp to use ARC2 energy lock. Due to that the beam polarization was measured with targets 4 and 5 only.
- There was an energy lock in ARC2 but the beam energy in Hall A was shifted and fluctuated (see strip chart).
- At 11am MCC change parameters of ARC2 energy lock (increase sumpling).
- Moller results have to be corrected on the beam energy fluctuation.
| # | Wien angle | beam | runs | target | Ptarget% | Pbeam% | comments |
|---|---|---|---|---|---|---|---|
| 1 | 74.73° | 1.0 µA | 13860-13865 | 5 | 8.01 | 90.34±0.2±2.0 | |
| 2 | 74.73° | 1.0 µA | 13866-13871 | 4 | 7.51 | 87.39±0.2±2.0 | |
| 3 | 74.73° | 1.0 µA | 13872-13875 | 5 | 8.01 | 89.00±0.2±2.0 | |
| Aver 1-2 | 74.73° | - | - | - | - | 88.83±0.1±2.0 | Targets 4-5 |
A copy of this log entry has been emailed to: saha@jlab.org, brads@jlab.org, gen@jlab.org, doug@jlab.org
Figure 1
Figure 2 Energy fluctuation strip chart
Figure 3 Beam position strip chart
