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User name O. Glamazdin
Log entry time 17:49:34 on February 09, 2009
Entry number 260040
keyword=Moller resultsMoller results on Feb 09 11:30-16:15
Tuning took about 1h30m and it was no beam from 12:30 till 14:40- There was no energy lock.
- The raster was ON.
- For the beam energy and current - see the charts attached. The energy seems to have fluctuated much smaller than at 5 passes.
| # | Wien angle | beam | runs | target | Ptarget% | Pbeam% | chi2 |
|---|---|---|---|---|---|---|---|
| 1 | 30° | 0.75 µA | 13152-13157 | 5 | 8.02 | -72.6±0.2±2.0 | 2.4 |
| 2 | 30° | 0.75 µA | 13162-13165 | 4 | 7.50 | -71.7±0.3±2.0 | 1.8 |
| 3 | 30° | 0.52 µA | 13166-13170 | 2 | 8.22 | -70.7±0.2±2.0 | 0.4 |
| average 1,2,3 | 30° | average the targets | -71.7±0.1±2.0 | 3.6 | |||
The energy measured (HALLA:p) fluctuated on the first Chart with an amplitude 0.2MeV and has a shift +0.4MeV over experiment energy 1230MeV. On the second Chart (when dipole problem in Arc was fixed) it seems the energy measured (HALLA:p) has only fluctuation around 1230MeV with no shift.
At the Wien filter angle 30deg. and the beam energy 1230MeV we have in
the HallA 78% of 100% longitudinal polarization (at the Wien angle
54deg.). If we scale
Moller result with the beam polarization at 54deg. = 90.58% (see Moller
results from Spin Dance 01/13/09) we have 90.58*0.78=70.65%.
A copy of this log entry has been emailed to: gen@jlab.org
Figure 1
Figure 2
Figure 3
