GlueX Start Counter Meeting, March 5, 2020

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GlueX Start Counter Meeting
Thursday, March 5, 2020
10:00 am EST
CEBAF Center, Room L207
BlueJeans: 556 286 544


  1. Announcements
  2. Review minutes from the last meeting
  3. Calibration and Efficiency (Rupesh)
  4. Dark Rate Studies (Beni, Rupesh)
  5. Other Run Planning
  6. Action Item Review



  • FSU: Sean Dobbs
  • JLab: Rupesh Dotel, Tolga Erbora, Mark Ito, Simon Taylor, Beni Zihlmann

There is a recording of this meeting on the BlueJeans site. Use your JLab credentials to gain access.

Review minutes from the last meeting

We looked at the minutes from the February 6 without significant comment.

Calibration and Efficiency

Rupesh presented recent work on calibrating the propagation delay for the start counter for the current run. See his slides for the details. From his talk, before and after calibrations plots of start counter hit time vs. position in paddle 1.

Sc calibration rupesh.png

The timing resolution he gets is about 320 ps for 150 nA running and 330 ps for 350 nA running. Jobs take a long time to run because he needs a full run of statistics and tracking must be done to get a position along the start counter paddle.

Rupesh will update constants in the CCDB and re-do the calibrations periodically to check stability.

Dark Rate Studies

  • Beni took some data earlier this week. Stay tuned for results...
  • Young collaborators from Miami will look into taking on more responsibility in this area.