[Halld-pid] Time-of-Flight Meeting Minutes, January 22, 2015

[Mark Ito]

Folks,

Find the minutes below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_22,_2015#Minutes 
.

   -- Mark
_________________________________________


GlueX TOF Meeting, January 22, 2015, Minutes

Present:

  * *FSU*: Hussein Al Ghoul, Paul Eugenio, Sasha Ostrovidov, Aristeidis


Tsaris

  * *JLab*: Mark Ito (chair), Simon Taylor, Beni Zihlmann


Announcements

  * The weekly run coordination meetings are now being held at 8:45 am
    in the Counting House. Use the general GlueX number to connect with
    BlueJeans.


Calibration Status

  * Sasha is working on the time-walk corrections. He is suffering from
    low statistics for some PMTs, especially at the edges of the
    detector. He is referencing the TDC times against the times from the
    FADC firmware. He sees some quantization of the FADC times, this may
    be due to fast rising pulses with too few samples on the leading
    edge of the pulse.
  * Sasha has also started looking at the TOF hit factory to understand
    details of the code.
  * Simon has been using reconstructed tracks to map out the edges of
    the TOF counters. He sees gaps between the counters beyond the 6 cm
    width, as expected. The wrapping for each counter is 1 mil of Mylar
    and 2 mils of ESR but there is a contribution from departure from
    the ideal shape of the scintillators. When the arrays were put
    together there was 1/2 inch extra in total for one plan and 3/8 inch
    for the other, or very roughly 300 microns of gap. Mark thought we
    should also be able to look at the survey data to get an idea of the
    gaps. Hussein also has some numbers from measurements made during
    assembly.


Preparations for Spring Run

We went over Mark's recently updated list of DAQ tasks 
<https://halldweb1.jlab.org/wiki/index.php/TOF_DAQ_Tasks,_January_22,_2015>. 
Paul thought that the important task that we have not addressed is gain 
monitoring and equalization. We will try next to prioritize the work.

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  * This page was last modified on 26 January 2015, at 23:35.


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