Run Coordinator's Report for 28 March Swing to 29 March Day

Summary

Data taking went smoothly overnight. Day shift spent in beam studies, polarimetry, and feedback device calibration.

We are attempting to arrange the repair of the Hall C primary AC unit such that it does not interfere with beam delivery. Contractors do not need to enter the hall, but they do need access to the top of the mound covering the hall. That is a radiologically controlled area and cannot be accessed when there is beam in the hall. The contractors will diagnose the problem during beam studies tomorrow (Tuesday) and (hopefully) repair it during beam studies on Wednesday. I have asked the PD to combine Wednesday's and Thursday's beam studies periods in order to buy the contractors more time to do the work. He seemed amenable to that.
The BCM calibration changed rather significantly when it was measured on Saturday (80671). Not sure what would have caused this; still looking into it.

Asymmetry runs on LH₂ with 40 渙 of longitudinally polarized electrons.
Daily beam studies:
- Monday to Wednesday: 09:00 to 12:00
- Thursday to Friday: 09:00 to 11:00
Moller, IHWP change, and RIP calibrations on Monday, Wednesday, and Friday after beam studies.
BCM calibration (after Hall C AC repairs are complete, Friday perhaps?)
Requested Test Plans
- FastBus phototube gain calibration (6 hrs) - anytime
- Wells plot deadtime study (5 hrs) - anytime

AC in hall
Non-statistical widths in detectors 13 and 14 of octants 4 and 8
Elevated Silviu ratio in detectors 1 and 2 of octants 2 and 6
Spikes in French electronics
Apparent increasing frequency of NA LTD errors
Crosstalk with target IOC and target FSD box when the Musson box is rebooted remotely
Changed behavior of BPM 3H00C Y position with respect to other hall BPMs
Discrepancy in beam current measured by BCM1/2 and the MPS BCM.