October 25, 2022

RC Meeting Information

• Return to RC meeting main page

RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting house meeting room (2nd floor)

• Zoom remote connection information:

 Join ZoomGov Meeting
 https://jlab-org.zoomgov.com/j/1607100885?pwd=ZFBsRTFsYm5Zb0laZ0tyZXNjcEE0QT09
 Meeting ID: 160 710 0885
 Passcode: 595071
 One tap mobile
 +16692545252,,1607100885# US (San Jose)
 +16468287666,,1607100885# US (New York)
 Dial by your location
       +1 669 254 5252 US (San Jose)
       +1 646 828 7666 US (New York)
       +1 669 216 1590 US (San Jose)
       +1 551 285 1373 US
       833 568 8864 US Toll-free
 Meeting ID: 160 710 0885
 Find your local number: https://jlab-org.zoomgov.com/u/ab2CekLXgQ

Useful Links

• Shift Signup (Read only)
  • Shift Signup

• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Current Status

• SHMS: 8 degrees, -9.2 GeV, 1x, 2x 1-7 off
• HMS: 20 degrees, -4.27 GeV (setting 5)
• 5pass beam, 30 to 60uA

Run Plan

• Continue data taking.
• MCC is planning (not scheduled) a beam current ramp rate test, up to 5uA/s for Hall C. Target expert (Silviu) said all targets are fine.
• Hall A pass change next week ( Monday the 31st ?)
• Short RF recovery on Thursday

Issues

• SHMS DC1 HV tripped. Shift worker was able to bring it up after a few trials. https://logbooks.jlab.org/entry/4068409 This trip seems to correlate with the high rate at SHMS. For future reference, we should run LH2 with <=50uA and LD2 <=30uA as long as SHMS is at 8 degree. https://logbooks.jlab.org/entry/4068405
• The HMS Dipole NMR readback fluctuated since this morning https://logbooks.jlab.org/entry/4068509
• HMS CODA crash (ROC3) https://logbooks.jlab.org/entry/4068495

Notes

• watch beam stability
• need more shift workers (always)
• SHMS rates high (~3k w/o PS), 6M events per run?

To do

• Install Q1 SHMS vacuum gauge (~3hr)
• calibrate SHMS Dipole LN2 valve during next access https://logbooks.jlab.org/entry/4064490. For now, monitor the ice accumulation if any https://logbooks.jlab.org/entry/4064528
• reboot or replace the SHMS angle camera https://logbooks.jlab.org/entry/4067528
• replace GEM gas bottle
• UNSER calibration