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
• When analyzing LD2 or Al dummy or LH2, please leave the target_mass_amu in the standard.kinematics as that of the proton, but when analyzing the data with the pionLT script, specify the target used, as different targets will have different ranges in the cuts when integrating the missing mass peak. Refer to log entry: https://logbooks.jlab.org/entry/4005387 These instructions are given in the pionLT run plan.

Current Issues

• shift crew continues to see HMS DC noise outbursts more frequently, see log-entries:
  • https://logbooks.jlab.org/entry/4005325
  • https://logbooks.jlab.org/entry/4005330
• study noise dependence on HMS DC thresholds, and found that noise temporarily went away @ DC threshold 5.8 V, but re-appeared on the next runs see log-entry --> https://logbooks.jlab.org/entry/4005624 This issue will have to be addressed during next Hall C access during accelerator maintenance day on Thursday Jun 23

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 ( DONE )
    • Bob Michales found that the channels in FADC ROC 4 Slot9 where offset by +1 (see https://logbooks.jlab.org/entry/4005398 ) so calorimeter map will need to be updated for run range: 14933 (Jun 13) - 15079 (Jun 21) The offset was fixed by Bob Michales by simply offsetting all channels in FADC Slot 9 so that signal cable 1 starts at channel 0, and so on
  • Xinzhan Bai request to go to controlled 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 ( DONE )
• 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 )
  • Bob Michales will go to the HMS Hut to try and fix the HMS DC noise issues. https://logbooks.jlab.org/entry/4005325, https://logbooks.jlab.org/entry/4005330 ( PENDING ) Alternatively, we can try to raise the HMS thresholds to 6.0 V, verify that the tracking efficiencies are not compromised. I verified (without beam) that at 6.0 V, the noise goes away ---> https://logbooks.jlab.org/entry/4005579 but we will need beam on production target to verify tracking efficiency is OK at HMS DC threshold = 6 V.
  • Xinzhan Bai and Jixie Zhang request to change gas bottle for solid Cherenkov detector: Contact: xbai@jlab.org, cell: (434) 422-2809 ( 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