RC meeting and Run Plan, Monday November 21st

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RC Meeting Information

Time:at 3:30pm today

• Location: Counting house conference room

• Join ZoomGov Meeting
• https://jlab-org.zoomgov.com/j/1619032184?pwd=aWhTVWxya1ZZQzA1K2ZPSTd2ZX...
• Meeting ID: 161 903 2184
• Passcode: 260715
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RC Updates

Summary of swing 11/20 - day 11/21

• Smooth swing and owl shifts, and collected good fraction of production data on polarized He3 target @45uA beam current with prescale: ps1=9, ps2=15, ps3=0, ps5=3 and all other -1
• Target polarization was in average ~48% during the data taking
• South Linac went to restricted access after MCC meeting today to repair turbo pumps (no estimation provided)
• SL came back to beam permit around 1:30 pm, but issue with 2L17 and 2L25 power supply
• Target EPR calibration is ongoing since 1 pm (estimated for 2-3 hrs)

Short term run plan

• Continue production data taking on polarized He3

1. 45uA of beam current | Use ps3=0, ps5=3, rest =-1 | One hour long runs
2. Move the target to the pickup coil position, and do NMR sweep around every 2 hours
3. Return to step 1

• Integration of SBS-GEMs into the Main DAQ
• Consideration to increase beam current to 50uA

Issues

• Shift schedule unfilled for next week
• Dump right Ion chamber cabling needs to be changed (Jerry Kowal is aware of it)
• Two channels of hodoscope has issue https://logbooks.jlab.org/entry/4087074

Hall Access List

• William Henry (target work)
•  ??

Summary of GEn data taking

• 57 out of 141 days (40.43%)
• Uncorrected accumulated charge on He3: 33.51C out of 232C (14.44%)