GlueX TOF Meeting, December 6, 2017

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GlueX Time-of-Flight Meeting
Wednesday, December 6, 2017
10:00 am EST
JLab: CEBAF Center, Room F226
BlueJeans Meeting number is 350 531 998


  1. Announcements
  2. Review of minutes from the previous meeting
  3. Run Readiness
  4. Calibration Status
  5. PMT testing [1]
  6. NIM Paper (Paul)
  7. 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
  • JLab: Thomas Britton, Mark Ito (chair), Beni Zihlmann

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


Beni complete the Hot Check-Out for the TOF. We are ready to go.

PMT Testing

Sascha reported that all 25 PMTs have gone through single photo-electron testing. He showed some plots of results for selected tubes. The calculated gains track those supplied by Hamamatsu, but the amount of variation from the Hamamatsu number is about 25%. In the original batch of TOF PMTs, the variation was more like 10%. There is also a (previously noted) large variation in the yield of single-pe events from tube to tube.

The tubes will now go on to tests with an americium source.