Run Coordinator report: Fall 2021 w1

My RC tenured covered the beam restoration and first week of physics beam delivery. In summary, it was a relatively successful week given that it consisted of commissioning done with accelerator operation still trying to establish physics beam to Halls B, C and D. Beam became available nearly on time and at the end of my RC tenure, we were well along in commissioning, with beam quality checkout mostly done, detector/beamline calibration/checkout done, the new detectors commissioning ongoing, trigger set-up started and diamond (JD70-103) aligned, with the diamond quality (from the coherent peak shape) appearing to be quite good. There was no important problem on the Hall D side. The major tasks that remained before being ready for data production were understanding the new detectors, in particular the CToF, optimizing the photon flux/polarization, and setting up the level-1 trigger. The more detailed summary follows:

Physics beam delivery was scheduled for Wednesday June 8 2022. The beam came nearly on-time, with Beam Operation Group (Ops) asking us to be ready by 11am-noon for physics beam. We required shifts to be manned starting at noon but beam came the next day (Thursday 9th) around 8am-9am mainly due to problem trying to tune beam to Hall C (Hall B was still open: they started a few days late due work on their polarized target). One significant item was regarding our beam tuning was that one of the quadrupole (MQP5C09) on Hall D line is currently not operable. CASA devised a tune for us that does not use this quad, so we have an unusual beam tuning at the moment. Our program started after Ops did our Ion Chamber calibration. We started by checking our radiation levels checks, which were reasonably good. We then did the radiation levels scans with current (50nA, 75nA, 100nA) and radiator thickness (RL=0, 1E-4 and 3E-4). They show similar behaviors than those of the latest run (Fall 2021), which had some marked differences with those of previous runs. Then, the beam envelope and convergence was checked and found to not be good. Beam transport was refined during Friday night.