Run Coordinator report: winter 2023 w10

The last week of the winter, 2023 GlueX run started on Wednesday, March 15 with machine development during the day shift. After that, beam was restored during the swing shift and continued for the remainder of the run with a 3-hour interruption on Thursday for a visitor’s tour of Hall D. Other smaller interruptions occurred on Thursday morning (3 hours, machine vacuum issue), Friday morning (5 hours, RF klystron failure) and Saturday morning (3 hours, working on the machine). Wednesday evening through early Thursday morning were spent setting up the trigger for high-intensity running at 900nA, and collecting a large dataset of close to 1 billion events with a diamond radiator in 0/90 PERP orientation at 900nA. Data acquisition livetime at this intensity was achieved by raising trigger thresholds on the BCAL and FCAL until the total event rate dropped to 75kHz, with PS triggers prescaled by a factor ~3. Physics production data collection continued outside this high-rate test period, with a total of 2.5B events in the two polarization PARA orientations and 3.2B events in the two PERP orientations, and 1.2B events with the aluminum radiator. The imbalance between PARA and PERP orientations this week was intentional, to help recover that balance between all four orientations over the full 2023 run period. The physics event statistics for the complete 2023 run period ended up at approximately 32B events in each of the four polarizations, and 21B events taken with the aluminum radiator. From accelerator startup to shutdown, this is a total of 68 days at an average of 2.2B physics triggers recorded per calendar day. Compared with our beam-on acquisition rate of 65K events per second at nominal intensity, these final statistics correspond to 40% efficiency. This 60% inefficiency includes planned accelerator downtime (tours, machine development periods) as well as machine outages / RF trips (BNA) and experiment downtime (BANU).