GlueX TOF Meeting, December 1, 2021

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GlueX Time-of-Flight Meeting
Wednesday, December 1, 2021
11:00 am EST
BlueJeans: 350 531 998


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


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

There is a recording of this meeting. Log into the BlueJeans site first to gain access (use your JLab credentials).

Review of minutes from the last meeting

We sent over the minutes from the meeting on November 3rd.

Occupancy Plots

Beni noted that in the occupancy plots shown last time, the set with the magnetic field on is noticeably narrower that the one with field off. This is understandable due to the focusing of the solenoidal field. The asymmetry observed with the field on is still a mystery though.


Beni has been steadily working on TOF calibrations throughout the PrimEx run and continuing on into the SRC run. He has submitted constants for the PrimEx data to the CCDB. Also he is keeping up with the calibration jobs for SRC, processing every fifth run.

TOF II Trigger

There will be a test of the TOF II trigger on the last day of the now-extended SRC run. Ilya Larin, Sascha Somov, and Mark will be here to conduct it. Hai Dong responded to an email thread that he has performed tests on the new firmware and it is ready to go as far as he is concerned.

Beam Angle Measurement during SRC

Beni has obtained results for the measurement with the carbon targets. Simon is working on a measurement as well. Beni sees a positive slope in the projection of the beam on the x-z plane and a negative slope for y-z. The effect is about 2 mR for each, but depends on cuts applied to χ2 and the z-position of the target peaks. These variations are probably due to statistics.