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User name O.Glamazdin
Log entry time 18:56:52 on October 13, 2009
Entry number 294760
keyword=Moller resultsMoller results on October 13 12:00 - 18:50
- Crew: O.Glamazdin, A, Saha, Chun-Min Jen (Mindy)
- Wien filter angle is 17.20°
- The raster was ON. The half wave plate was IN.
- Beam tuning took more than 2hours.
- A. Camsonne and O.Glamazdin: controlled access to the hall A to reboot portserver hatsv5 and Moller DAQ crate.
- In the beginning of measurements single arm scalers rate was very unstable (runs 13657-1366). The reason is very narrow slit to reduce the beam current from 100uAmp(HAPPEX) to 0.5uAmp(Moller) at the same attenuator. After discussion with MCC crew chief we have change attenuator from 165 to 85 and adjust current with slit. Single arm rates becomes stable and reasonable.
| # | Wien angle | beam | runs | target | Ptarget% | Pbeam% | comments |
|---|---|---|---|---|---|---|---|
| 1 | 17.20° | 0.60 µA | 13661-13666 | 5 | 8.03 | -88.60±0.3±2.0 | Attenuator=165 Slit=14.2 |
| 2 | 17.20° | 0.55 µA | 13668-13671 | 4 | 7.51 | -87.91±0.3±2.0 | Attenuator=85 Slit=16.0 |
| 3 | 17.20° | 0.30 µA | 13672-13675 | 3 | 7.54 | -88.39±0.2±2.0 | Attenuator=85 Slit=15.6 |
| 4 | 17.20° | 0.20 µA | 13676-13679 | 2 | 8.23 | -89.42±0.2±2.0 | Attenuator=82 Slit=15.4 |
| 5 | 17.20° | 0.60 µA | 13681-13685 | 5 | 8.03 | -89.10±0.2±2.0 | Attenuator=82 Slit=16.2 |
| Aver. 2-5 | 17.20° | - | - | 2-5 | - | -88.86±0.1±2.0 | Targets 2-5 |
A copy of this log entry has been emailed to: gen@jlab.org, saha@jlab.org, cjen@jlab.org
Figure 1
