GlueX Start Counter Meeting, October 31, 2019

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GlueX Start Counter Meeting
Thursday, October 31, 2019
10:00 am EDT
CEBAF Center, Room L207
BlueJeans: 556 286 544


  1. Announcements
  2. Review minutes from the last meeting
  3. Calibration and Efficiency
    • dE/dx
  4. Dark Rate Studies
    1. HallD logbook
  5. Run Planning
  6. Action Item Review


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2019 on the JLab CUE. This directory is accessible from the web at .



  • JLab: Mark Ito, Simon Taylor

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

Start Counter section of GlueX NIM paper

Mark has finished a first draft of the section on Overleaf.

dE/dx from the start counter

Sean Dobbs asked that we discuss the quality of the start counter dE/dx measurement and how it compares to Monte Carlo. We did not have the right people to discuss calibration, etc., but Simon reported that he is looking at the comparison between Monte Carlo and data.

Dark Rate measurement

Beni Zihlmann provided a plot of dark current that adds a point taken a few days ago. He noted that the value reproduces the value that we saw at the end of the PrimEx run.