Run Coordinator report: spring 2019 w11

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The past week of PrimEx-D running was smooth and productive. We have collected almost 9B triggers on LHe target and half billion triggers on empty target (Monday 5 pm till Tuesday 1 pm). The target was emptied on Monday during beam studies and refilled Tuesday afternoon.

We had 122 hours of the acceptable beam (out of scheduled 160 hours), and used 116 hours. Half of the total lost 6 hours was because of FCAL bases and HV crate replacement, which was partially overlapped with target refilling. Another half of the lost total time was due to stopping and starting runs and DAQ crashes (30 min). The beam energy fluctuations were within +/- 5 MeV.

Up to now, we have collected 122% of the expected data for this spring period of PrimEx-D. Accelerator machine performance exceeded the expected 1/2 value.

The attached plots show exclusive eta distribution on production angle for beam energy greater than 9 GeV collected till April 4th on LHe target. That is of course very preliminary and a lot of work is ahead. For comparison, I attached the plots from the previous Primakoff eta measurement. The bottom figure shows the Compton signal collected by that time on LHe target and scaled empty (black histogram).