[Halld-pid] Time-of-Flight Meeting Minutes, December 2, 2014

[Mark M. Ito]

Folks,

Please find the minutes below and at

https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_December_2,_2014#Minutes

   -- Mark
______________________________________________


GlueX TOF Meeting, December 2, 2014
Minutes

Present:

  * *FSU*: Hussein Al Ghoul, Paul Eugenio, Sasha Ostrovidov, Aristeidis
    Tsaris
  * *JLab*: Mark Ito (chair), Beni Zihlmann
  * *NU*: Sean Dobbs


Announcements

  * Mark encouraged us to start looking at the offline monitoring
    histograms for the TOF. They are linked on the right side of the
    main wiki page.
  * Mark announced that we think we have a solution for syncing the TOF
    CAEN TDCs to the other detector timing systems. Beni made a plot
    demonstrating perfect correlation between the time difference
    between FADC and TDC time measurements and the TI timestamp. This
    correlation can be used to break the 4 ns ambiguity in the event
    time origin. Mark will post the plot in the log book
    <https://logbooks.jlab.org/entry/3310913>.
      o Paul pointed out that we should use the TOF logbook to
        communication progress.
  * Mark reported that at today's morning run coordination meeting we
    started putting together a run plan. If there is special running
    needed for the TOF, it should be communicated soon.


Calibration Progress

Sasha has written code to emulation mode 7 data. His code give 
distributions agree with the mode 7 data we have taken, but differ from 
the results from mode 8 data where an offline routine was used to derive 
summary information about pulses. He is using this new code to proceed 
with calibrations.
With beam data, Sasha is looking at the time offsets of the x and y 
plane. He the mean time in both planes and looks at their difference. He 
does not see the sharp structure he expects presently. He also sees 
inconsistencies between different "intersection regions" (the 6 x 6 cm 
regions where the x and y counters cross). He is using field off, mode 8 
data.

CCDB Table Review

Beni proposed that we expand the information in the calibration tables 
so that channel labeling information (plane, counter, end) appears 
explicitly in the tables rather than their current presentation as a 
one-dimensional array of floating point numbers. He will make a proposal 
to the group on how we might change things.

Low-Level TOF Status

Sasha agreed to give the talk next week summarizing the status of TOF 
pedestals, rates, etc., at the morning run coordination meeting.
Retrieved from 
"https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_December_2,_2014"

-- 
Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295

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