[Halld] [EXTERNAL] Run Coordinator Summary, Jan 29 - Feb 5, 2020

[Alexander Ostrovidov]

Hello,

I have been GlueX Run Coordinator for the week of Jan 29 - Feb 05, 2020. 
During this week, we were mostly taking production data at 350nA beam current.
About 20.2B production triggers have been collected in the last seven days 
(out of 49.4B triggers collected in four weeks of running).

We were scheduled for 164 hours of beam time. The beam was available for 
107 hours. Out of 107 hours, we used beam for 92 hours (ABU) and lost 
15 hours (BANU). There were 2 major repairs, each lasting about 4 hours -
to replace a broken control card for a goniometer and to restart two
vacuum pumps in the tagger hall. Another 3 hours were spent on planned
configuration changes (radiator rotations, harp scans, etc). Finally,
about 3 hours were lost on troubleshooting different detector and
software issues (resetting TAGH HV crate in the tagger hall, restarting
DAQ, reestablishing connectivity of DIRC N-board and so on).

We did harp scans twice, finding the beam acceptable both times. Two day
shifts have been spent on aligning the spare diamond JD70-106 (our current
diamond is starting to show signs of deterioration, most likely due
to thermal deformation). While the spare diamond has been aligned, we decided
to continue to utilize the current diamond as far as it still provides
an acceptable coherent peak.

A few smaller task has been accomplished as well - adjusted TPOL readout,
raised TOF voltages, measured ST dark rates, calibrated out some timing
shifts, performed routine FCAL maintanence and so on.

There were 2 changes to the running procedure this week. First, we have 
convinced MCC to start inserting a retractable beam dumplet for any 
goniometer movement. Without it, 10nA beam bleed through during "no-beam"
radiator changes was almost doubling the cummulative radiation damage
to the electronics in the tagger hall. In a trade-off, we had to increase
the period between radiator changes from 1-2 hours to 2-4 hours.

The plan for the next week is to continue production data-taking at 350nA.

Alexander Ostrovidov