GlueX PID Meeting, April 30, 2010
Minutes

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


Minutes from the last meeting

   We reviewed [18]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 [20]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.

   Retrieved from
   "http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_PID_Meeting%2C_April_30%2C_2010"

References

  18. http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_PID_Meeting%2C_April_16%2C_2010#Minutes
  20. https://halldweb1.jlab.org/talks/2010-04/New%20ADC%20spectra%20from%20TOF%20paddle.html