RC meeting and Run Plan, Monday January 23rd

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RC Meeting Information

Current RC: Iuliia Skorodumina
Time: Daily at 3:30PM
Location: Counting House Conference Room

Remote Connection Details

Summary

Sunday Swing (01/22). Shift started with 30 uA, then we went up to 35 uA.

At aroung 17:30 there was a power glitch (https://logbooks.jlab.org/entry/4115123). The glitch affected SBS magnet, which tripped. Before recovering from the first power glitch, another occurred (https://logbooks.jlab.org/entry/4115152), so there was no beam for about 3 hours.

When the SBS magnet tripped, no alarm followed (https://logbooks.jlab.org/entry/4115142). The Shift Crew discovered the magnet issue when they observed the abnormalities during the NMR Measurement (https://logbooks.jlab.org/entry/4115137). The issue with the SBS magnet trip affected the target polarization, which dropped a bit (down to 42.6% at 18:00). The polarization quickly recovered, though, rising up to 48.2% by 20:30.

Once the accelerator recovered from the power glitches, we performed a quick beamcheck (https://logbooks.jlab.org/entry/4115180) and around 20:30 went back to production. MCC started with delivering 35 uA, then we went up to 40 uA, and at around 21:30 up to 45 uA.

There were several GEM HV trips after the beam restoration. GEM expert was contacted and the issue was fixed (https://logbooks.jlab.org/entry/4115195 and https://logbooks.jlab.org/entry/4115224).

Swing Shift summary (https://logbooks.jlab.org/entry/4115103).


Monday Owl (01/23). We were taking production data at stable 45 uA overnight. However, not without difficulties.

BBCal HV issue (https://logbooks.jlab.org/entry/4115349). It turned out that the HV values for problematic channels were not loaded, so Arun helped the Shift Crew to load them (https://logbooks.jlab.org/entry/4115366).

CODA crashed and was fixed by Alex (https://logbooks.jlab.org/entry/4115340).

GEMs HV tripped and Sean had to increase the trip threshold (https://logbooks.jlab.org/entry/4115384).

Finaly, at the end of the shift the target IOC crashed again and Jack had to reboot it (https://logbooks.jlab.org/entry/4115472).

Owl Shift summary (https://logbooks.jlab.org/entry/4115391).

Run plan

  • Continue production on pol He3 cell at 45 uA.
  • Tuesday Day -> Beam studies start at 8:30 am (for 4 hours) -> Controlled Access?
  • Moller Measurement? January 30 is a new scheduled date for the Wien angle change because Hall B will not start running until then.

Shift Schedule

Please consider signing up for shifts [1].

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