[Halld-pid] Time-of-Flight Meeting Minutes, August 22, 2017

[Mark Ito]

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_22,_2017#Minutes 
.

__________________________


    Minutes

Present:

  * *FSU*: Brad Cannon, Sasha Ostrovidov
  * *JLab*: Thomas Britton, Mark Ito (chair), Simon Taylor, Beni Zihlmann

There is a recording of this meeting <https://bluejeans.com/s/Bi_oO/> on 
the BlueJeans site.


      Review of minutes from the previous meeting

We looked at the minutes from July 11 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_July_11,_2017#Minutes>. 


The HV mainframe that Paul identified on his trip to JLab is ready to 
go, pending signature on the shipping authorization form.


      Calibration Status


        Time Calibration

Beni gave a report.

  * The new timing calibration, using the pulse amplitudes rather than
    the pulse integrals are now being used in the default version of the
    software.
  * Last week, new tables were added to the MC variation. The code was
    complaining about a lack of constants even though they are not
    needed for simulated data.
  * Paul Mattione reported that in the plot of t_TOF −t_RF vs. momentum
    there is a 300 ps. offset. Beni checked that with the old
    calibration, there was still an offset of 100 ps.
  * Sean Dobbs reported that the new constants introduced an offset in
    the times of the TDCs relative to corresponding ADC time. Beni is
    doing a new channel-by-channel calibration which is in progress.
    Since the calibration requires tracking and retrieval of files from
    the tape library, this is taking a while to get through (time scale
    weeks).
  * After this final calibration step is done, the next items are to
     1. clean up the code
     2. update the documentation
  * Runs 30,000-30,274 had no TOF calibration constants defined.
    Although there are no real runs in this range, Beni assigned
    constants in case simulated data needs them.

At tomorrow's Analysis Meeting Beni will present the results of his TOF 
efficiency study, based on material already published in the wiki.


        Energy Calibration

Brad will give us a report at the next meeting.

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

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