GlueX TOF Meeting, July 5, 2016

From GlueXWiki
Revision as of 10:45, 5 July 2016 by Ostrov (Talk | contribs)

Jump to: navigation, search

GlueX Time-of-Flight Meeting
Tuesday, July 5, 2016
11:00 am EDT
JLab: CEBAF Center, Room F326/327

Agenda

  1. Announcements
  2. Review of minutes from the previous meeting
  3. PMT Gains: The folowing plots show the signal peak amplitude for hits that are matched to tracks
    the data are from different runs where we did a beam current scan starting with 40nA and going up to 150nA. At 40nA beam current the peak amplitudes look still reasonable, but already at 80nA a degradation is noticeable which becomes critical at even higher currents(luminosities). The radiator was 50um diamond.
    • Run 11634 with 40nA beam current:
      Adc peak run11634.gif
    • Run 11635 with 80nA beam current:
      Adc peak run11635.gif
    • Run 11637 with 110nA beam current:
      Adc peak run11637.gif
    • Run 11636 with 150nA beam current:
      Adc peak run11636.gif
  4. The degradation of the PMTs over the spring run period is illustated with the following plots shoing the RAW ADC Signal amplitudes for an early run (run 10346) and a late run (run 11634 save as above low current 40nA)
    • Raw TOF data Signal amplitude RUN 10346 (left) track matching hits (right):
      Tofpmt amp raw run10346.gif Adc peak run10346.gif
    • Raw TOF data Signal amplitude RUN 11634 (left) track matching hits (right)::
      Tofpmt amp raw run11634.gif Adc peak run11634.gif


    • Current PMT HV:
      Current HV settings.png
  1. Calibration Status
  2. NIM paper: svn co https://halldsvn.jlab.org/repos/trunk/publications/GlueXTOF

Communication

Slides

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 https://halldweb.jlab.org/talks/2016/ .