GlueX TOF Meeting, October 25, 2017

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GlueX Time-of-Flight Meeting
Wednesday, October 25, 2017
11:00 am EDT
JLab: CEBAF Center, Room CC226


  1. Announcements
  2. Review of minutes from the previous meeting
  3. Calibration Status
    • Time Calibration
    • Energy Calibration
  4. PMT testing
  5. NIM Paper (Paul)
  6. Action Item Recap



Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2017 on the JLab CUE. This directory is accessible from the web at .



  • FSU: Sasha Ostrovidov, Brad Cannon
  • JLab: Thomas Britton, Simon Taylor, Beni Zihlmann

There is a recording of this meeting on the BlueJeans site.



Review of minutes from the previous meeting

We reviewed the minutes from the previous meeting.


Code for TOF Hit factory has been updated. The default time window for matching ADC and TDC hits has been increased from 10 to 20ns to match the output signal width of the discriminators. The code was modified to NOT overwrite already found matches with new TDC match but instead make new Hit.

PMT testing

The new HV power supply sent to FSU already stopped working. Us single channel module for now. Gain measured for 10 PMTs. The measured gains differ from the factory values by +/- 10-20% this is more than previously seen. One PMT seems to have very low QE.