GlueX TOF Meeting, September 9, 2020

From GlueXWiki
Jump to: navigation, search

GlueX Time-of-Flight Meeting
Wednesday, September 9, 2020
10:00 am EDT
BlueJeans: 350 531 998


  1. Announcements
  2. Review of minutes from the last meeting
  3. TOF Status
  4. Calibration
  5. TOF NIM paper
  6. Action Item Recap


Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2020 on the JLab CUE. This directory is accessible from the web at .


Present: Mark Ito (chair), Sasha Ostrovidov, Susan Schadmand, Simon Taylor, Beni Zihlmann

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

Review of minutes from the last meeting

We went over the minutes of the August 26 meeting.


Beni complete the re-calibration, but Sean found two runs where the constants had problems. Beni used nearby runs to provide constants for the problematic runs. This may indicate a residual bug in the calibration code. This will be examined in the future.

TOF NIM paper

Not forgotten, not progressing either.

Work during the SAD

Beni brought our attention to an email he sent to Eugene in response the Eugene's call for items that need work during the Scheduled Accelerator Down. From Beni's message:

With regard to the TOF we have to do some maintenance on the PMTs. At this point I do not yet know how many PMTs we need to replace but I think there will be a few. Paul Eugenio has developed tools that this PMT replacements can be done in-situ. However we have to learn how to use them. If we find that the one suspicious paddle with weird signal shape is more than just a bad PMT, like a broken light guide we may consider taking the TOF down and lay it flat in order to fix it. This obviously will require some more resources and may need the assistance and/or at least guidance of FSU.

Visits of collaborators to the Lab is discouraged during MEDCON-5. Some advanced planning will be required to do this work.

Action Item Recap

  1. Decide on when to ship PMTs to JLab from FSU (Mark, Paul Eugenio)
  2. Prepare a complete draft of the TOF NIM paper. (all)
  3. Make a plan for TOF repair during the SAD. (all)