BPM calibration information

• 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
  • Mar. 7, 2017
  • Dec. 1, 2017
  • Jan. 10, 2018
  • Aug. 17, 2018
  • Feb. 7, 2019
  • July 17, 2020
  • Aug. 17, 2021
  • May 31, 2022

• 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