RC Meeting, Wednesday, September 15, 2021

RC Meeting Information

RC Daily Meetings at 10:00, remote

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Useful Links

• Autumn 2021 Shift Schedule
• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Tuesday Status

• No beam until roughly mid swing shift due to RF separator work
  • This will continue (and hopefully finish) today
• Lots of other work done though
• Brad cycled the HGC gas see the log entry, thanks Brad!
  • Light in the HGC looks a lot more like what we expect now, see the numerous log entries checking and confirming this -
    • Log Entry #1
    • Log Entry #2
    • Log Entry #3
    • Log Entry #4
• Ali updated the report file output, things look more realistic now as noted in his log entry
  • He also improved the efficiency of the physics replays, should be ~10% faster now - log entry
  • Preliminary detector efficiencies also added - log entry
• Carlos checked on the BCM calibrations and implemented them - log entry
• I ran an updated SHMS Calorimeter calibration log entry
  • This doesn't seem to have percolated through to some replays and/or it is a bit off
  • Jacob and Simona are investigating
• I re-analysed an earlier setting and found that our improvements to various param files have helped a lot - log entry
• Simona was taking a closer look at the NGC following some quick analysis/checks I'd done in the morning, something look a bit odd log entry
  • It looks like one side of the NGC sees drastically less light than the other
• Nearing the end of this kinematic point
  • Nathan and the shift crew overnight rotated out to our central (SHMS 8.26) setting - log entry
  • Not much longer at this angle once we get beam back, then we rotate out another 2 degrees to our left setting
  • Running at 15uA on LD2, rates look ok as posted in this log entry
    • For comparison, here's 8uA at SHMS 6.26 from last night - https://logbooks.jlab.org/entry/3905501
  • See the status page for more

Current Status

• Down due to Hall D startup work again
• As far as I know, should expect beam in swing shift again

Current Run Plan

• Carry on with current setting once we get beam back
• Finish off the centre and left LD2- Q2=1.60, W=3.08 settings
• HeeP Singles next
  • This will be a fairly intense block of shifts!

Current Issues

• The HGC now looks great as mentioned... but now the NGC looks strange
  • Seeing next to nothing on one side of the fp
  • See this log entry

Planned Accesses to the Hall

• We have no beam till ~ swing. I did not schedule a sweep, but if you want to go in for some reason, an escorted access should be possible