Difference between revisions of "BPM calibration information"
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! 1/11/2023 !! Harp scan !! 0.06 !! -0.35 !! -0.69 !! -0.20 !! -0.03 !! 0.38 !! - !! - !! - !! - !! - !! - !! | ! 1/11/2023 !! Harp scan !! 0.06 !! -0.35 !! -0.69 !! -0.20 !! -0.03 !! 0.38 !! - !! - !! - !! - !! - !! - !! | ||
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| + | ! 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 !! | ||
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| + | ! 1/20/2024 !! Harp scan !! 0.16 !! -0.46 !! -0.89 !! -0.50 !! -0.10 !! 0.03 !! - !! - !! - !! - !! - !! - !! | ||
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| + | ! 2/21/2024 !! Harp scan !! 0.12 !! -0.81 !! -0.86 !! -0.44 !! -0.49 !! -0.06 !! - !! - !! - !! - !! - !! - !! After IPM3H07B work | ||
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** [https://hallcweb.jlab.org/wiki/images/4/45/C2034.pdf May 31, 2022] | ** [https://hallcweb.jlab.org/wiki/images/4/45/C2034.pdf May 31, 2022] | ||
| − | * Summary of survey information | + | * 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. |
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!1/10/2018 !! - !! - !! - !! - !! - !! - !! 0.01 !! 0.11 !! -0.12 !! 0.08 !! Harps only after wire repair | !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 !! | ||
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| + | !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 | ||
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| + | !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 | ||
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| + | !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 | ||
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| + | !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 | ||
| + | |- | ||
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Latest revision as of 07:43, 28 February 2024
- 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 |
- Beamline surveys
- 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 |
