RC Meeting and Run Plan, Tuesday December 19th 2019

RC Meeting Information

RC Daily Meetings are at 4:15 PM, 2nd floor Counting House Meeting Room

• Bluejeans remote connection information:

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Useful Links

• Main Pol He-3 wiki
• Shift Schedule
• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Yesterday's Run Plan

Wednesday Swing + Thursday Owl shifts:

• Elastics data taken on reference cell filled with N2, H2, empty and finally He3. Online analysis plots available for the elastics data taken yesterday.
• N2, H2, He3 pressure curves runs data taken
• BCM calibration (+ parasitic MOLLER run) data taken
• Could not perform the energy measurement due to arc2 energy lock limitations.
• Beam charge asymmetry measurements performed. "Flipper" script ran after HWP retraction.
• Data taken on Brianna!!
  • longitudinal asymmetries (1 hr DAQ running time)
  • Delta resonance asymmetry run (2 hrs with HWP + 2 hrs w/ HWP)

Target related work:

• Cooling jets flow rate increased as they indicated temporary instability
• Polarimetry debugging
  • NMR -- Target field rotated by 180 to checkout polarization. NMR performed at regular intervals. Shows some polarization that needs to be understood.
  • EPR -- working but noisy
  • pNMR -- turned off to be debugged later

HMS + SHMS

• Paddles that need to be turned off optimized to look at elastic peak.

Current Run Plan

Thursday -->Day shift (+ Swing + Owl):

• Spectrometer rotation from 11.7 to 8.5 SHMS - done
• Energy measurement - done
• MOLLER setup - in progress
• Optics delta scan runs with carbon foils (Jones et al will do it in the evening)
• Back to He3 longitudinal asymmetry measurements till 8:00 AM.
• Perform NMR at regular intervals

• Day by Day Options [1]

Notices in Effect for Shift Crew

• Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled access.
  • Good examples for entering and leaving laser access.
• Magnet policies
  • HMS Q1 must be ramped down in 50A steps in all cases
  • Do not ramp HMS Q2 to zero, only go to 10A and then switch off power.
• Inform the RC of any access that the Target Team requires. The RC will coordinate with RadCon to make everything run smoothly.
• The operators have been somewhat careful with our beam orbit locks. Please make sure that the orbit locks are enabled and the beam does not drift from its nominal position.
• Ramp rate lock instructions are here and added to checklist[2]
• Temporary Laser instructions can be found here [3]

Current Issues

• Polarimetry debugging in progress

Special Requests

• Keep target expert schedule filled out on whiteboard