GlueX TOF Meeting, November 8, 2017

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GlueX Time-of-Flight Meeting
Wednesday, November 8, 2017
10:00 am EST
JLab: CEBAF Center, Room F224-225
BlueJeans Meeting number is 350 531 998

Agenda

  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

Slides

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 https://halldweb.jlab.org/talks/2017/ .

Minutes

Present:

  • FSU: Brad Cannon, Sasha Ostrovidov
  • JLab: Fernando Barbosa, Thomas Britton, Eugene Chudakov, Mark Ito (chair), Simon Taylor

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

Announcements

There has been no change to the nominal start date for the run in December.

Review of minutes from the previous meeting

We went over the minutes from October 25 without significant comment.

HV Problem

Fernando reported on a problem with one of the TOF CAEN HV chassis. The entire chassis was not responding. Nick Sandoval and Chris Stanislav narrowed the problem down to a single module in the chassis and replaced it. All appears to be working now. The suspect module will be tested and returned to CAEN for repair if need be.

PMT Testing

Sascha reported that 23 of the 25 PMTs have been tested now. Because of the HV supply being used (with analog dial HV setting), the applied voltage cannot be repeated as precisely as in years past.

There is still one tube with an apparently low quantum efficiency as shown in plots presented at the previous meeting. Sasha will investigate further, beyond the single photo-electron test that exhibits the problem.

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