GlueX PID Meeting, April 30, 2010

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Location, Time

Friday, April 30, 2010
2:00 pm EDT
JLab: CEBAF Center, Room F326/7
ESNet: 8542553
EVO: direct meeting link
Conference Group: 800-377-8846, participant code: 77438230
Slides: talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2010-04 on the JLab CUE (you have to be a member of the "halld" group). This directory is accessible from the web at .


  1. Announcements
  2. Minutes from the last meeting
  3. Status Reports: all
  4. Action Items


  • FSU: Sasha Ostrovidov
  • JLab: Mark Ito (chair), Sascha Somov, Elliott Wolin

Minutes from the last meeting

We reviewed the minutes from last time.

Tim and Eugene are reviewing total helium use in the Hall to confirm the justification for purchasing the pulse tube refrigerator for the target.

Status Report

Sasha Ostrovidov gave us an update on the TOF prototype development. The ADC pedestals problem has been fixed. A large effective DC offset was induced by bad levels on the gate signal. After the fix, pedestals returned to normal, sub-signal-level channels. He showed new plots of left vs. right channel ADC values for a 80 ns wide gate. Sasha will try to lengthen the gate further.

He will now turn to analyzing this data to get a time-walk correction. To begin with, he is using a parabolic fit to the time as function of pulse height on each end and minimizing the width of the combined signal by varying the resulting six parameters. Sasha would welcome suggestions for other approaches to this problem.

Mark reported that Paul Eugenio is in contact with Hamamatsu and will soon receive a quote for six additional phototubes. Paul is also working on the construction MOU.