[Halld] Run Coordinator Report for March 2-8

[Sean Dobbs]

Dear Collaborators,

I served as Run Coordinator from March 2nd to 8th, 2017.

Overall Summary
=================

The primary goal of this period was to continue production data taking and
perform necessary systematic measurements before accelerator priority
shifted to Hall C on March 6th.  Data taking was reasonably productive,
with beam available 109 out of the scheduled 152 hours (72% of the time),
of which we used 94 hours. We took roughly 11B triggers, reaching a total
of 48B triggers out of the planned 60B.  The largest sources of downtime in
the experiment were two separate problems with FCAL fAD250 boards and
recurring connection problems between DAQ components.  We accomplished
several other tasks, including tests of the fADC250 firmware and the start
of minimum-bias studies to understand the trigger efficiency.

Daily Notes
============

Mar. 2) After re-establishing good beam delivery on the morning of the
previous day, despite some monitoring/DAQ communication issues, we report
our most productive day of the week with 3.1B triggers collected over the
previous 24 hour period.

Mar. 3) Most of the previous day was taken up by various accelerator
problems.  Data taking resumed at 8PM, and 1.3B triggers were collected.

Mar. 4) The previous day shift was given over to several studies,
including: Tagger/SC trigger studies; tests of fADC250 compressed mode;
Hall A bleed-through tests; an empty target run. After this a total of 1.7B
triggers were collected.

Mar. 5) At the beginning of owl shift, trigger problems were noticed that
were traced to a bad fADC250 board in the FCAL.  The board was disabled
until it could be replaced in the morning.  In the meantime, low photon
flux data for trigger studies was taken, with a total of ~14 M triggers.
In all, 2.3B triggers were recorded.

Mar. 6) Aside from a couple instances of needing to re-steer the beam, data
taking went smoothly, with 2.7B triggers recorded.

Mar. 7) Day shift was dedicated to recommissioning beam delivery to Hall C.
After this, injector and other accelerator problems delayed beam delivery
to the hall until around 5 AM. <5 M triggers were taken before beam
delivery was stopped at 8AM for scheduled beam studies. Systematic harp
scans were also performed.

Mar. 8) We spent most of the day in controlled access.  Accelerator beam
studies were stopped after a couple of hours due to ice buildup that
prevented the retuning of some problem cavities.  Eventually low-current
CEBAF running was restored, and we took data overnight starting at around
9PM, of a total of 1.0B triggers.
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