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/e/e8/C1999.pdf Aug. 17, 2021] | ** [https://hallcweb.jlab.org/wiki/images/e/e8/C1999.pdf Aug. 17, 2021] | ||
** [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] | ||
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| + | * 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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| + | {|border="1" align="center" | ||
| + | ! Date !! BPM AXoff !! BPM BXoff !! BPM CXoff !! BPM AYoff !! BPM BYoff !! BPM CYoff !! Harp AXoff !! Harp BXoff !! Harp AYoff !! Harp BYoff !! Notes | ||
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| + | !3/7/2017 !! -2.84 !! -2.88 !! -3.27 !! -0.21 !! -0.20 !! 0.05 !! -2.88 !! -3.07 !! -0.13 !! -0.04 !! | ||
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| + | !12/1/2017 !! -0.01 !! -0.01 !! -0.17 !! -0.27 !! -0.22 !! -0.16 !! 0.01 !! -0.12 !! -0.12 !! 0.02 !! | ||
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| + | !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 | ||
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| + | !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 |
