GlueX TOF Meeting, August 23, 2016

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GlueX Time-of-Flight Meeting
Tuesday, August 23, 2016
11:00 am EDT
JLab: CEBAF Center, Room F326/327


  1. Announcements
  2. Review of minutes from the previous meeting
  3. TOF Analysis Status
  4. Run Plan
  5. Calibration Updates
  6. NIM paper



Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2016 on the JLab CUE. This directory is accessible from the web at .



  • FSU: Sasha Ostrovidov
  • JLab: Brad Cannon, Mark Ito (chair), Simon Taylor, Beni Zihlmann

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


  • Brad is resident at JLab for next several months. He can be found in the FSU office, F335, CEBAF Center.

Review of minutes from the previous meeting

We looked at the minutes from August 16th. Since the last meeting, Beni has produced updated plots of efficiency versus run number with error bars.

Run Plan

Beni and Brad have been working on new code to get an estimate of good starting values of the high voltage based on the HV scan done at the beginning of the Spring 2016 run. It plots the pulse amplitudes versus end-to-end time differences. The idea is to find, for each tube, the lowest voltage that will put the pulses above discriminator threshold for a minimum ionizing hit at the far end. These results will have to be adjusted for long-term gain reduction suffered during the run. The exercise will be repeated with beam data once that is available.