June 19, 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:
  • no beam at the moment due to problem with vertical separator
  • found the cause of and resolved beam instability issues (high beam trip rate issue), so lower beam trips are expected once beam is restored
  • from this morning RC/PD meeting: BPM dispersion in C-line is measuring 1 mm off. PD would like to have the crew chief nudge the dipole closer to zero once beam is restored

• Experiment status:
  • Since yesterday, the shift crew has completed the first two production sub-settings (SHMS Right, Center) for pionLT. Currently waiting for recovery of beam to proceed to taking 'SHMS Left' setting.

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

• several analysis-related issues have been observed by Jacob:
  • lower coin. rates than expected: https://logbooks.jlab.org/entry/4004609#comment-38500
  • epsilon angles mismatch: https://logbooks.jlab.org/entry/4004615
  • two coin. time peaks observed since start of production: https://logbooks.jlab.org/entry/4004573
• typo in physics status page SHMS angle (Right, Center, Left) = 19.66, 21.66, 23.66, run-plan: 19.65, 21.65, 23.65

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