GlueX TOF Meeting, February 27, 2019

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GlueX Time-of-Flight Meeting
Wednesday, February 27, 2019
10:00 am EST
JLab: CEBAF Center, Room F226
BlueJeans Meeting number is 350 531 998


  1. Announcements
  2. Review of minutes from the February 13 meeting
  3. Shielding simulation
  4. DIRC "shielding"
  5. Calibration GlueX Note?
  6. Upgrade Plan
  7. NIM Paper (Paul)
  8. Action Item Recap


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2019 on the JLab CUE. This directory is accessible from the web at .



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

There is a recording of this meeting on the BlueJeans site. Use your JLab credentials to access it.

Review of minutes from the February 13 meeting

We went over the minutes.

  • Thomas did the ML training on Ashley's labeling. It does well, though it could benefit from a larger training sample for some low-probability cases. Still it is 95 to 96% accurate. He will present some slides next time.
  • The slides that Ashley Ernst showed at last week's collaboration meeting on Richard's simulations of the shield had received another iteration from Richard beyond what was shown at the last meeting. Both conditions were done without the DIRC[?].

DIRC "Shielding"

Sasha showed a slide where he plotted the ratio of scaler rates in the horizontal TOF counters between two runs, with-DIRC and before-DIRC, with-DIRC rates in the numerator, before-DIRC in the denominator. Note that the inner four counters had their HV turned of during the with-DIRC run. The shadow of the DIRC is clearly visible. He will be doing further studies to extend these results.

Upgrade Plan

Sasha reported that Paul Eugenio has been ordering material for prototype light guides.