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User name E.Chudakov
Log entry time 15:43:53 on November 28, 2008
Entry number 251193
keyword=Moller resultsMoller results on Nov 28 12:50-14:40
- The beam tune took 2h. The main problem was tripping the EP ion chamber. The beam strongly zig-zagged in Y (see entry 251185).
- The energy lock on Hall C, pulsed, was used. At 0.44 µA in Hall A the "HALLA:p" energy measurement is not very reliable and depends on the beam current (see the strip chart). On the other hand, the ARC-2 measurement "ARC2:p" is stable. The regular value of "HALLA:p" obtained at higher current with the Hall A energy lock is 5892 MeV.
- The difference with the previous measurements (about 74%) comes from the beam energy difference.
| # | beam | runs | target | Ptarget% | Pbeam% |
|---|---|---|---|---|---|
| 1 | 0.44 µA | 12971-12974 | 5 | 7.97 | 81.6±0.4±2.0 |
| 2 | 0.44 µA | 12975-12980 | 4 | 7.44 | 82.1±0.3±2.0 |
| 3 | 0.44 µA | 12981-12984 | 3 | 7.62 | 77.6±0.3±2.0 |
| 4 | 0.44 µA | 12985-12988 | 2 | 8.21 | 80.8±0.2±2.0 |
| 5 | 0.44 µA | 12989-12990 | 5 | 7.97 | 81.6±0.5±2.0 |
| 6 | 0.62 µA | 12991-12994 | 3 | 7.62 | 78.0±0.3±2.0 |
| 7 | 0.62 µA | 12995-12996 | 5 | 7.97 | 80.4±0.4±2.0 |
| average 1-4 | 80.5±0.2±2.0 | ||||
A copy of this log entry has been emailed to: glamazdi@jlab.org
Figure 1
