June 21, 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:
  • Ops will be doing RF work during day shift
  • Will try to bring Hall C to 80 uA during swing shift

• Experiment status:
  • pionLT completed data-taking @ kinematic setting: SHMS Right Q2=3.85 W=2.62 x=0.39
  • changed kinematics (shms angle) to SHMS Center Q2=3.85 W=2.62 x=0.39

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 updated with the new offset? Will this new offset be applicable at lower HMS momenta or will it over correct it? Is it better to put apply all corrections in the HMS field03 program rather than having offsets in the param file? Answer: DO NOT CHANGE hmsflags.param momentum offset. ONLY change the offset for the corresponding HMS momentum in the standard.kinematics file. As this offset is subject to rapid changes in the saturation region and may not be applicable for lower HMS momentum.

Planned Accesses to the Hall

• During the next accelerator RF recovery period (NOTE: Tues Jun 21 @ 08:00 up to noon), request Controlled Access (with Full Survey):
  • 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 )
• During the accelerator full maintenance day (Thursday Jun 23, 2022)
  • 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 )

Planned Accelerator Configuration Changes

• Accelerator RF Recovery period tomorrow, Tues Jun 21 from 08:00 am to 12:00 pm
• Full accelerator maintenance day on Thursday, Jun 23.

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