Run Coordinator report: fall 2022 w1
From GlueXWiki
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 HallC. 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 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 improve the AC performance at high gain needed 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