Difference between revisions of "BPM Calibration"
| Line 57: | Line 57: | ||
==<FONT Color="Green">How to perform a bulls eye scan</FONT>:== | ==<FONT Color="Green">How to perform a bulls eye scan</FONT>:== | ||
| − | + | ||
1. You need unrastered beam: | 1. You need unrastered beam: | ||
| − | - <FONT Color="red"> | + | - <FONT Color="red">This must be competed in phase 1! </FONT> |
| − | - use | + | - use single foil target. |
2. Ask MCC to steer the beam to the nominal center of the target. | 2. Ask MCC to steer the beam to the nominal center of the target. | ||
| − | 3. Wait until beam is stable and have MCC perform a harp scan for the two superharps near the target (1H04A and 1H04B) and take a CODA run for both the left and right spectrometers during the same time. Start the coda run first before asking MCC. Request MCC to make an ELOG entry with the Harp results, you should see all three harp wires. Record ELOG entry numbers. | + | 3. Wait until beam is stable and have MCC perform a harp scan for the two superharps near the target (1H04A and 1H04B) and take a CODA run for both the left and right spectrometers during the same time. Start the coda run first before asking MCC. Request MCC to make an ELOG entry with the Harp results, you should see all three harp wires. Record ELOG entry numbers and timestamps of both harpscans. |
4. Ask MCC then to steer the beam to positions around the nominal center: | 4. Ask MCC then to steer the beam to positions around the nominal center: | ||
Revision as of 10:44, 11 December 2017
Back to Installation and Commissioning
BPM Calibrations (Bullseye Scan) [1-2 hours]
| Relative position | LHRS CODA run | RHRS CODA run | Harp scan entry no. |
| (0,0) | |||
| (2,2) | |||
| (2,-2) | |||
| (-2,-2) | |||
| (-2,2) | |||
| (3,3) | |||
| (-3,-3) |
How to perform a bulls eye scan:
1. You need unrastered beam:
- This must be competed in phase 1!
- use single foil target.
2. Ask MCC to steer the beam to the nominal center of the target.
3. Wait until beam is stable and have MCC perform a harp scan for the two superharps near the target (1H04A and 1H04B) and take a CODA run for both the left and right spectrometers during the same time. Start the coda run first before asking MCC. Request MCC to make an ELOG entry with the Harp results, you should see all three harp wires. Record ELOG entry numbers and timestamps of both harpscans.
4. Ask MCC then to steer the beam to positions around the nominal center:
- cover at least the area the raster will cover: (2,2), (2,-2), (-2,-2), (-2,2), (3,3), (-3,-3), and repeat (0,0)
- repeat harp and CODA runs for each position
5. Record Harp scan run numbers and corresponding CODA run number for each beam position. As an example, see HALOG # 3324009.
6. Make a record of the harp scans and CODA runs in the HALOG.
How to analyze the bulls eye scan:
- detailed instructions can be found at the Analyzing BPMs website. - the shift crew is not expected to analyze the bulls eye scan.
Calibration
GMP completed a BPM calibration run early this fall run period. The results of the Bull's eye scan can be found on the Halla LogBook.