BPM calibration information
From HallCWiki
Jump to navigationJump to search- The beam position monitors (BPMs) on the diagnostic girder in Hall C (IPM3H07A, IPM3H07B, and IPM3H07C) are calibrated by comparison with the Hall C superharps (IHA3H07A and IHA3H07B). Ideally, a "bulls-eye" scan is done which allows one to determine the BPM offsets and slopes. However, a single harp scan is sufficient to check the BPM offsets.
- If re-analyzing/revisiting BPM calibrations, make sure that the appropriate survey offsets are loaded into the harp analyzer tool
- Table of BPM calibration information. Offsets and slopes are from the "RAW" epics variables (no survey offsets applied).
| Date |
Method |
AXoff |
BXoff |
CXoff |
AYoff |
BYoff |
CYoff |
AXslope |
BXslope |
CXslope |
AYslope |
BYslope |
CYslope |
Notes
|
| 1/13/2018 |
Calibration |
-0.06 |
0.07 |
-1.06 |
-0.46 |
0.12 |
0.61 |
-0.98 |
-1.12 |
-0.96 |
0.97 |
1.17 |
0.87 |
1st calibration
|
| 8/29/2018 |
Harp scan |
0.15 |
0.29 |
-1.08 |
-0.12 |
0.63 |
1.09 |
- |
- |
- |
- |
- |
- |
-
|
| 2/9/2019 |
Harp scan |
0.25 |
0.46 |
-1.01 |
-0.08 |
-0.04 |
-0.11 |
- |
- |
- |
- |
- |
- |
Radiator installed during January 2019 SAD
|
| 6/23/2019 |
Calibration |
0.11 |
0.17 |
-1.07 |
-0.40 |
-0.18 |
-0.40 |
-0.97 |
-1.11 |
-0.95 |
0.95 |
1.15 |
0.85 |
-
|
| 12/8/2019 |
Calibration |
0.14 |
0.22 |
-1.13 |
-0.06 |
-0.29 |
-0.78 |
-0.96 |
-1.09 |
-0.96 |
0.95 |
1.16 |
0.85 |
Polarized 3He running
|
| 9/5/2021 |
Harp scan |
-0.35 |
0.17 |
-0.83 |
-0.35 |
0.19 |
0.47 |
- |
- |
- |
- |
- |
- |
|
| 1/9/2022 |
Harp scan |
-0.08 |
0.32 |
-0.67 |
-0.40 |
0.20 |
0.43 |
- |
- |
- |
- |
- |
- |
|
| 6/9/2022 |
Harp scan |
0.16 |
-0.22 |
-0.54 |
-0.18 |
0.02 |
0.39 |
- |
- |
- |
- |
- |
- |
|
| 1/11/2023 |
Harp scan |
0.06 |
-0.35 |
-0.69 |
-0.20 |
-0.03 |
0.38 |
- |
- |
- |
- |
- |
- |
|
| 9/15/2023 |
Calibration |
0.16 |
-0.58 |
-0.97 |
-0.38 |
-0.03 |
0.00 |
-1.02 |
-1.06 |
-0.85 |
0.99 |
1.18 |
0.87 |
|
| 1/20/2024 |
Harp scan |
0.16 |
-0.46 |
-0.89 |
-0.50 |
-0.10 |
0.03 |
- |
- |
- |
- |
- |
- |
|
| 2/21/2024 |
Harp scan |
0.12 |
-0.81 |
-0.86 |
-0.44 |
-0.49 |
-0.06 |
- |
- |
- |
- |
- |
- |
After IPM3H07B work
|
- Summary of survey information. The BPM offsets shown below should not be used for hcana offsets - they just give an indication of the changes to the girder position. The harp offsets should be used in the harp analyzer.
| Date |
BPM AXoff |
BPM BXoff |
BPM CXoff |
BPM AYoff |
BPM BYoff |
BPM CYoff |
Harp AXoff |
Harp BXoff |
Harp AYoff |
Harp BYoff |
Notes
|
| 3/7/2017 |
-2.84 |
-2.88 |
-3.27 |
-0.21 |
-0.20 |
0.05 |
-2.88 |
-3.07 |
-0.13 |
-0.04 |
|
| 12/1/2017 |
-0.01 |
-0.01 |
-0.17 |
-0.27 |
-0.22 |
-0.16 |
0.01 |
-0.12 |
-0.12 |
0.02 |
|
| 1/10/2018 |
- |
- |
- |
- |
- |
- |
0.01 |
0.11 |
-0.12 |
0.08 |
Harps only after wire repair
|
| 8/17/2018 |
0.05 |
0.04 |
-0.26 |
-0.06 |
-0.01 |
0.45 |
0.01 |
0.10 |
0.03 |
0.01 |
|
| 2/17/2019 |
0.15 |
0.20 |
-0.14 |
-0.32 |
-0.45 |
-0.30 |
0.34 |
0.59 |
-0.07 |
-0.62 |
After radiator installation
|
| 7/17/2020 |
-0.06 |
0.02 |
-0.05 |
-0.37 |
-0.43 |
0.44 |
0.17 |
0.04 |
-0.07 |
-0.11 |
During polarized 3He running
|
| 8/17/2021 |
-0.05 |
0.13 |
0.16 |
0.17 |
0.52 |
-0.17 |
-0.14 |
-0.07 |
0.00 |
-0.07 |
First running after pol. 3He
|
| 5/31/2022 |
-0.03 |
-0.79 |
0.30 |
-0.18 |
-0.45 |
-0.54 |
-0.15 |
-0.64 |
-0.08 |
-0.64 |
Cause of shifts not clear
|
| 9/5/2023 |
-0.04 |
-0.88 |
-0.45 |
-0.37 |
-0.58 |
0.02 |
0.03 |
0.01 |
-0.24 |
0.01 |
Cause of y shifts not clear
|
