GlueX Start Counter Meeting, April 16, 2015

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GlueX Start Counter Meeting
Thursday, April 16, 2015
10:00 am EDT
CEBAF Center F326/327


  1. Announcements
  2. Collaboration Meeting
  3. Review minutes from the March 19 meeting
  4. Detector Status
  5. Calibration
  6. DAQ Tasks for Spring 2015 Commissioning Run
  7. Action Item Review




Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2015 on the JLab CUE. This directory is accessible from the web at .



  • FIU: Werner Boeglin, Mahmoud Kamel
  • JLab: Mark Ito (chair), Eric Pooser, Simon Taylor

Collaboration Meeting

FIU will make the presentation. They will need 30 minutes. It will be some combination of Eric and Mahmoud.

We had a brief discussion of ideas for an online calibration. Werner pointed out that the thing we need to know earlier rather than later are the various thresholds of the detector.

Detector Status

Stable. The start counter is in the bore and ready to take data.


Work continues on refining time-walk corrections and propagation delay corrections.

  • Time Walk. Eric is exploring using the pulse maximum rather than pulse integral as the input to the time-walk correction function.
  • Propagation Delay. Using the Fall data to measure the delays has been difficult. FIU will try to use the test bench data obtained during construction as a basis for a correction scheme.

Next Meeting

We agreed to meet again in a week.