Run Coordinator report: Fall 2021 w14

The RC week began with data production on the liquid helium target in full swing after a half-day down time due to a problem with the fourth-pass separator in the accelerator. In addition to production running at 150 nA we took ~39 million events at low intensity (50 nA) and ~100 million events with the compton calorimeter inserted in the beam. We took ~5.9 billion production events before changing the target to liquid deuterium during the swing shift on Saturday 11/20/21. We then took data on the deuterium target with few interruptions until the solenoid dumped due to a faulty sensor on Monday 11/22/21 at about 11:45 am. It took half a day to diagnose and fix the problem and ramp the magnet back up the full current. Production data taking resumed at 11:20 pm , but we took advantage of the availability of beam to perform some background studies for the pair spectrometer with the triplet polarimeter converter removed from the beam while the magnet current was ramping up. All four diamond orientations were used interspersed with a handful of runs using the amorphous radiator. We ended the data production on liquid deuterium with empty target runs before warming up the target in anticipation for replacing the cryotarget with a ladder of carbon foils on Wednesday 11/24/21 morning. We took ~7.7 billion events on liquid deuterium, which represents ~133.5% of the expected amount of data for this target. The RC week ended with the successful installation of the carbon target. By the time of the change to the carbon target, the experiment had collected ~100% of the expected amount of data on the liquid helium target and ~58% of the expected amount of data on the empty target. The only other development of note was that the humidity level in the upstream BCAL modules was rising, but this did not impact the performance of the detector.