June 20, 2022

RC Meeting Information

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:

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Useful Links

• Shift Signup (Read only)
  • Shift Signup
• PionLT_2022_Physics_Status
• KaonLT Logbook - Used for PionLT updates too
  • Physics analysis updates should be cross posted here
• Run Plans
• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Current Status

• Accelerator status:
  • 45 uA beam delivered to Hall C ~ mid Swing shift yesterday (Jun 19) after long down period since 6 am
  • Accelerator sill working hard to try and get Hall C up to 80 uA, will have maintenance/RF recovery on Tuesday @ 8:00 am (since Wed is for setting up Hall B spin dance)

• Experiment status:
  • completed Q2=3.85, W=3.02 SHMS Left Setting (~ 45,000 counts)
  • completed Q2=3.85, W=3.02 SHMS Right-2 (theta_shms=18 deg) Setting (~ 45,000 counts)
  • completed HMS elastics singles (W peak looks to be in right location) --> https://logbooks.jlab.org/entry/4004929, https://logbooks.jlab.org/entry/4004990
  • started new kinematic setting Q2=2.72, W=2.63 SHMS Left Setting (theta_shms=16.33 deg) --> https://logbooks.jlab.org/entry/4004989

Current Run Plan

pionLT Summer 2022 Run Plan
Physics Status

Notices in Effect for Shift Crew

• Please pro-rate ABU for max current limit in run plan (uA) in beam time accounting. For example, if we receive 15 uA instead of the max_current_limit in the run plan, then the ABU should be: ABU_prorated = 15/(max current limit) * ABU
• Message from Ole Hansen: There will be a brief (<30min) outage of the Hall A and Hall C /work servers on Tuesday (6/21). This will happen during the workday already instead of the usual 5pm-10pm time slot for monthly IT maintenance. Please plan accordingly, i.e. don't start any mass replays ;-)
• Check the HMS/SHMS rates for when production starts, since for Heep coin. production SHMS saw higher rates. Make sure shift crew takes snapshot of scalers at every setting

Current Issues

• HMS singles elastics results and its implications (based on where the W peak is) to constraining (improving) the HMS saturation corrections at HMS momentum ~ -6.792 GeV, a momentum where saturation effects varies rapidly. --> https://logbooks.jlab.org/entry/4004990
  • M. Jones found W peak @ 0.925 MeV, which is ~ 15 MeV lower than the ideal (~0.940), so hmsflags.param will have to be updates with the new offset?

Planned Accesses to the Hall

• During the next accelerator maintenance period (Wed Jun 22):
  • S. Lassiter needs to put crush washers in LCW filters, so we may see a little bit of water by the HMS boogie for now, until he can put the washers next week, during maintenance period HMS Dipole LCW ( PENDING )
  • Hall C Expert needs to check SHMS ROC 4 Slot 9 Channel 0 FADC for potentially loose connection, as Column 5, Row 1 block appears to have no occupancy. SHMS Cal Occupancy ( PENDING )
  • Xinzhan Bai request to go to restricted access to quickly swap MPD electronics out and check signals (~ 30 min.), whenever there is extended down (most likely during next accelerator maintenance period) : Contact: xbai@jlab.org, cell: (434) 422-2809 ( PENDING )
  • Hall C Expert should check HMS ROC 3 (in HMS Hut) pertaining to this log-entry: ROC 3 TDC FIFO Error ( PENDING )

Special Requests

• Mark Jones would like to take HMS optics data with a 4x4 mm^2 raster at some point (when HMS is at a lower momentum, i.e., current setting) for checks. ( DONE )
  • D. Gaskell took a run with Carbon target and raster set to 4x4 mm^2. See run https://logbooks.jlab.org/entry/4004280