AN Beam Energy Dependence
A number of measurements were taken with the CNI and E880 polarimeters
running in parallel. The beam was accelerated to a flat top energy. The CNI
polarimeter took data for the first part of the flat top. Then, the beam was
debunched, and the E880 polarimeter took data. The table below (compiled by
Haixin Huang) summarizes the data that was taken. The errors are
statistical only. The in AN of E880 is not included.
| Gγ | CNI "polarization" |
CNI χ2 |
E880 asymmetry |
E880 χ2 |
E880 polarization | Date (in 2003) |
| 7.5 | 396.38±1.23 | 1.49 |
33.57±0.13 | 2.39 | 73.6±0.29 |
May 15 |
| 12.5 | 189.34±0.67 | 5.30 |
17.80±0.16 | 0.67 | 67.7±0.9 |
May 17,21 |
| 18.5 | 108.66±0.89 | 1.99 |
11.69±0.26 | 0.95 | 64.6±1.4 |
May 28 |
| 24.5 | 84.33±1.30 | 0.87 |
8.08±0.27 | 0.36 | 64.1±2.1 |
May 30 |
| 41.5 | 44.67±0.49 | 1.85 |
3.37±0.13 | 1.03 | 48.8±1.9 |
May 27-28 |
| 46.5 | 26.27±0.73 | 1.18 |
1.80±0.17 | 0.71 | 31.0±2.9 |
May 29 |
The AN values used for the E880 polarimeter were only
calibrated for
Gγ = 7.5, 41.5 and 46.5. Gγ = 7.5 uses the calibration with
forward arms done in 2002. For Gγ = 41.5 the E925 calibraion is used,
and the value is extrapolated to 46.5. The calibration for Gγ = 12.5,
18.5 and 24.5 is based on a fitting curve on old E880 data.
AN for the CNI polarimeter:
AN values for the CNI polarimeter were calculated
using the polarizations from E880 in the table above. Only statistical errors
are shown in the plots below.
ε vs. beam energy
(pdf)
ε -t dependence
(pdf)
AN vs. beam energy
(pdf)
AN -t dependence
(pdf)
maintained by: Jeff Wood, wood@physics.ucla.edu
last updated: 11/19/03