[Sbs] RC daily update and meeting reminder, June 10, 2025

[Andrew Puckett]

Hello all,

Hall A running was relatively smooth over the last 24 hours (particularly during day and swing shifts). We are now up to 4.2 C collected since the start of my RC tenure on June 4 and 19.8 C in total.

Two significant changes to running conditions occurred since yesterday’s meeting:


  1.  HCAL trigger threshold was lowered to 20% of elastic kinetic energy due to concerns over energy calibration/threshold uncertainty/trigger efficiency
  2.  ECAL trigger threshold was increase to 65% of elastic, which should have a minimal impact on the trigger efficiency while significantly reducing the rate.

As the big full replays with tracking started on Sunday evening start to pour in, new concerns have developed over GEM HV settings/gain/tracking efficiency. We are temporarily running at the relatively calmer beam current of 7 uA until we can systematically determine what are the optimal HV settings at which to run the experiment.

Let’s meet on Zoom and in person at the CH 2nd floor conference room to discuss the run plan and the plans for tomorrow’s accelerator down.

For more details and Zoom link info, see the RC daily meeting page at the wiki here: https://sbs.jlab.org/wiki/index.php/RC_meeting_and_Run_Plan,_Tuesday,_June_10th

Best regards,
Andrew

Andrew Puckett
Professor, Physics Department
University of Connecticut
196 Auditorium Road, Unit 3046
Storrs, CT 06269-3046
Office phone: (860) 486-7137
https://puckett.physics.uconn.edu<https://puckett.physics.uconn.edu/>
puckett at jlab.org<mailto:puckett at jlab.org>

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