RC meeting and Run Plan, Thursday May 16th

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RC Meeting Information

Current RC: Jiwan Poudel

RC Daily Meetings are at 3:30 (pm) via Zoom and in person in the counting house meeting room (2nd floor)

• Zoom connection link: https://jlab-org.zoomgov.com/j/1616220064

Useful Links

• Shift Schedule
• Hall A Logbook
• MCC White Board
• Experiment run plans

Summary

• Beam off for pass change in Hall C around 9:20 yesterday then Hall is accessed to fix GEM DAQ and BBCAL-HV
• First harp scan during day shift wasn't good https://logbooks.jlab.org/entry/4305263, and MCC took beam away to fix optics
• Tune back back to hall in swing shift only. Beam profile and carbon hole scan https://logbooks.jlab.org/entry/4305386 was good, so ready for production around 17:50
• HCAL threshold scan with 2uA was completed for -15 to -35 mV https://logbooks.jlab.org/entry/4305569

Accelerator

• Accelerator beam studies currently scheduled on May 19th (starting at 7:00 am) and May 20th (until 7:00 am)

Current Run Plan

• Raster is on.
• Target is LD2 with a radiator
• BB magnet at 750 A and SBS magnet at 1470 A (70%)
• Set ps3=0 (coin trigger), ps5=5 , all others to -1 .
• Set BBCal threshold to approximately ~1140 MeV ( -300 mV in BBCALHI DAC) and HCAL threshold (-25 mV)
• Beam current ~2.5 uA
• 2 hr long runs

Current Issues

• Frequent DAQ crashing (mostly during the start of run )
• SBS magnet readback current fluctuation (set to 1470 A but reaches upto 1500 A sometimes) https://logbooks.jlab.org/entry/4305766, https://logbooks.jlab.org/entry/4305709

Future plans

• Moller measurement--when??
• Hall Access to remove Analyzer on Sunday (Radcon will survey the hall starting 7:00 am)
• GEMs HV/Luminosity scan on Sunday https://docs.google.com/document/d/1rIy6yNIc4nWDFDWbIboZqdVADxWlbNlhXIRjIiuWVaU/edit