Difference between revisions of "Run Coordinator report: fall 2022 w1"
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(Created page with "Summary of August 25 - August 31, 2022 * The first part of the week (Wednesday, Thursday, and Friday morning) was used to change the setup configuration from CPP to PrimEx-et...") |
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− | Summary of August 25 - August 31, 2022 | + | Summary for the week of August 25 - August 31, 2022 |
* The first part of the week (Wednesday, Thursday, and Friday morning) was used to change the setup configuration from CPP to PrimEx-eta. | * The first part of the week (Wednesday, Thursday, and Friday morning) was used to change the setup configuration from CPP to PrimEx-eta. | ||
− | * The second part of the week was used for the beam commissioning and starting physics production | + | * The second part of the week was used for the beam commissioning, CCAL calibration, TAGM calibration, and starting physics production |
− | ** The beam commissioning went relatively fast as the accelerator was still on during the configuration change | + | ** The photon beam commissioning went relatively fast as the accelerator was still on during the configuration change. The beam recovery took less than 3 hours. Also, the commissioning was greatly simplified: no ion chamber threshold determination was needed, and no radiation study was done. During the commissioning, we find out that the Active Collimator was not working properly. The inner -Y quadrant was saturating. This was solved by Nick with the support of Richard. Because of that we lost approximately 4 hours of the beam as access to Collimator Cave was needed. |
+ | *** Instead of AC, we used the Beam Profiler for the beam to lock on for part of the week | ||
+ | ** CCAL snake-scan used HallC bleedthrough coming out of the slite we are sharing with HallA. Nevertheless, it produced a stable electron beam of >1.5nA. | ||
+ | ** Production data was taken, after Sasha re-establish the PrimEx trigger, (~1B trigger) with "Be empty target" and with solenoid B-field on and off, half of this data was taken with a buggy AC and the rest with a debugged AC. In both cases, the beam was locked on the AC. | ||
+ | ** Richard performed a TAGM Vbias scan and new threshold determination. | ||
+ | ** Hovanes did a PS HARP scan. The background level is below 2% and similar to the previous PrimEx runs. | ||
+ | * On the last day of the week: | ||
+ | ** The Be target was inserted. | ||
+ | ** Nick further improves the AC performance at high gain needed (by tuning the baseline of the inner +Y quadrant) for low beam current operation and in particular TAC run | ||
+ | ** Nick also debugged the 3 SC missing channels by nudging the cable a little bit | ||
+ | ** It was decided not to touch the CDC as we can live with two HV channels broken |
Latest revision as of 13:50, 31 August 2022
Summary for the week of August 25 - August 31, 2022
- The first part of the week (Wednesday, Thursday, and Friday morning) was used to change the setup configuration from CPP to PrimEx-eta.
- The second part of the week was used for the beam commissioning, CCAL calibration, TAGM calibration, and starting physics production
- The photon beam commissioning went relatively fast as the accelerator was still on during the configuration change. The beam recovery took less than 3 hours. Also, the commissioning was greatly simplified: no ion chamber threshold determination was needed, and no radiation study was done. During the commissioning, we find out that the Active Collimator was not working properly. The inner -Y quadrant was saturating. This was solved by Nick with the support of Richard. Because of that we lost approximately 4 hours of the beam as access to Collimator Cave was needed.
- Instead of AC, we used the Beam Profiler for the beam to lock on for part of the week
- CCAL snake-scan used HallC bleedthrough coming out of the slite we are sharing with HallA. Nevertheless, it produced a stable electron beam of >1.5nA.
- Production data was taken, after Sasha re-establish the PrimEx trigger, (~1B trigger) with "Be empty target" and with solenoid B-field on and off, half of this data was taken with a buggy AC and the rest with a debugged AC. In both cases, the beam was locked on the AC.
- Richard performed a TAGM Vbias scan and new threshold determination.
- Hovanes did a PS HARP scan. The background level is below 2% and similar to the previous PrimEx runs.
- The photon beam commissioning went relatively fast as the accelerator was still on during the configuration change. The beam recovery took less than 3 hours. Also, the commissioning was greatly simplified: no ion chamber threshold determination was needed, and no radiation study was done. During the commissioning, we find out that the Active Collimator was not working properly. The inner -Y quadrant was saturating. This was solved by Nick with the support of Richard. Because of that we lost approximately 4 hours of the beam as access to Collimator Cave was needed.
- On the last day of the week:
- The Be target was inserted.
- Nick further improves the AC performance at high gain needed (by tuning the baseline of the inner +Y quadrant) for low beam current operation and in particular TAC run
- Nick also debugged the 3 SC missing channels by nudging the cable a little bit
- It was decided not to touch the CDC as we can live with two HV channels broken