GlueX Start Counter Meeting, December 3, 2015

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GlueX Start Counter Meeting
Thursday, December 3, 2015
10:00 am EST
CEBAF Center, Room F326/327


  1. Announcements
  2. Review minutes from the last meeting
  3. Run Readiness
  4. Calibration Update
  5. 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, Beni Zihlmann

Run Readiness

Eric went to the Hall yesterday to go through the Hot Checkout List. He and Nick Sandoval found 3 dead channels. On the scope there is a large DC offset on them; it looks like a loose connection between the ST-1 and ST-2 boards. Also Eric could not see output on the FADC scalers. He thought this might be related to changes in the ST crate to add the TRD (spare FDC package) read-out to the crate (some F125s). The signals look good at the front panel of the FADCs.

This morning at the Run Planning meeting it was announced we will not pull back the start-counter/target cart to fix the dead channels.

Eric will try soon to read-out the start counter via the DAQ in any case. The start counter remains un-checked in Hot Checkout.


Mahmoud is going through Eric's code to do the light propagation delay calibration. He sees clear separation of times when referenced to the RF signal, both for the time-of-flight and the start counter. This is work-in-progress.