GlueX TOF Meeting, April 19, 2016

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GlueX Time-of-Flight Meeting
Tuesday, April 19, 2016
3:00 pm EDT
JLab: CEBAF Center, Room A110


  1. Announcements
  2. Review of minutes from the previous meeting
  3. Calibration Status FSU
  4. Calibration Status JLab
  5. mcsmear parameters
  6. Run Status
  7. 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 .



  • JLab: Mark Ito (chair), Simon Taylor, Beni Zihlmann
  • FSU: Brad and Sasha absent due to shift taking duties.

Calibration Status, JLab

Beni has been working on the calibration system.

Timing Calibration

  • He has changed the philosophy from a completely stand-alone system, to one that can run as part of the Calibration Train. The new plug-ins have been checked into the Git repository.
  • He is currently correcting the configuration of his farm jobs to allow for enough disk space to accommodate the large ROOT files.
  • The scheme has been modified to use a global speed-of-light in the scintillator bars, saving unnecessary calibration effort.

Energy Calibration

  • This is work in progress.
  • He is now using the same two attenuation lengths for all counters (i. e., light loss is modeled as a sum of two exponentials).
  • The code in the TOF library will have to change as a result.

mcsmear Parameters

We reviewed Sean's compilation of mcsmear parameters for the Time-of-Flight. We noted that the list of parameters is identical to those for the start counter. Mark and Simon had discussed the parameters some weeks ago in the context of the start counter, and were confident that those ideas could be easily applied to the TOF. Details of the discussion were not easily recalled by either one, but Mark assured us that he has notes.

Monitoring Histograms

We reviewed an example email from the "simple" email list that David, Justin, and Paul have put together. The mail sends out links to a minimal set of monitoring histograms, accumulated online, for runs taken during the previous twenty four hours.

We agreed that we need to designate a member of this working group to be responsible for reviewing the Time-of-Flight histograms daily during running.

NIM paper, Technical Design Report

Mark has started a draft of an updated section for the TOF for the TDR.