RC meeting and Run Plan, Friday, November 18th

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RC Meeting Information

Time:at 3:30pm today

• Location: Counting house conference room

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• https://jlab-org.zoomgov.com/j/1619032184?pwd=aWhTVWxya1ZZQzA1K2ZPSTd2ZX...
• Meeting ID: 161 903 2184
• Passcode: 260715
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• +1 646 828 7666 US (New York)
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RC Updates

Summary of swing 11/17 - day 11/18

• RF cavity issue after noon, so Gordon took this opportunity to access the hall to optimize oven temperature => variac tripped => hall access continued for manual adjustment (hall back to beam permit around 5 pm) https://logbooks.jlab.org/entry/4086166
• Continued Moller measurement, changed HWP-IN=>HWP-OUT, and completed measurement about 9:30pm after(Polarization HWPIN: 86.54 +/- 0.17 % and HWPOUT: -87.08 +/- 0.18 %). Large uncertainty on C20 vertical corrector during Moller measurement https://logbooks.jlab.org/entry/4086155
• Mini spin dance was cancelled due to timing (injector people could not support the dance after 9 pm, PD informed us the cancellation)
• Issue with RF when we were ready for harp scans before going to production run
• Beam back around 1:30 am and MCC took ~3 hrs to provide acceptable beam (followed the beam recovery procedure)
• Target polarization just before production run ~49.3% around 5 am
• Beam current increased in steps and BBCAL HI rates compared to get to 45uA on He3 target
• Everything looked good, so continued production run with polarized He3 target @45uA current
• Some DAQ issue in this morning, Alex was called to fix the issue (suspicion: interference of standalone DAQ for GEM to main DAQ)

Short term run plan

• Continue production data taking on polarized He3

1. 45uA of beam current | Use ps3=0, ps5=3, ps2=15, rest =-1 | One hour long runs
2. Move the target to the pickup coil position, and do NMR sweep around every 3 hours
3. Return to step 1

Issues

• Dump right Ion chamber cabling needs to be changed (Jerry Kowal is aware of this)

No RC meeting on Saturday and Sunday