[Halld-pid] Time-of-Flight Meeting Minutes, September 8, 2015

[Mark Ito]

Folks,

Find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_September_8,_2015#Minutes 
.

   -- Mark
   ___________________________________________________


  GlueX TOF Meeting, September 8, 2015, Minutes

Present:

  * *FSU*: Hussein Al Ghoul, Brad Cannon, Paul Eugenio, Sasha
    Ostrovidov, Aristeidis Tsaris
  * *JLab*: Mark Ito (chair), Simon Taylor, Beni Zihlmann


      Announcements

The run date is likely to be in December, though nothing is certain.


      Review of minutes from August 25

We looked at theminutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_25,_2015#Minutes>.


        ADC charge resolution and NSB/NSA

  * Beni updated his plots andposted them in the logbook
    <https://logbooks.jlab.org/entry/3350286>. He also included an
    example of a fit to the MIP peak and an example waveform.
  * Sasha asked about conclusions drawn from the study. Beni thought we
    should probably leave NSB at 5 but shorten NSA from 50 to 30.
  * Sasha was concerned about the effect on large pulses when the tail
    is cut-off, for example when studying attenuation. Beni pointed out
    that in the limit that all pulses are the same shape (geometrically
    similar) the small pulses have the same fraction of tail area cut out.


        Gain vs. High Voltage

  * Gains measured at FSU were all done at 1750 V. We might want to
    measure the exponent of the dependence of gain on HV with the
    installed system. Sasha is going to try and do that.


      Cosmic Running in the Hall

Sasha talked to Sascha Somov today. He (Somov) will get the TOF 
stand-alone trigger going sometime today.


      Calibration Automation

Brad is completely done with the system for running timing calibration 
jobs. He sent his constants to Beni and he put them in a private 
calibration variation. Using the constants reproduced essentially the 
same resolution those Beni had obtained some time ago.

We would like to run the system on new data as soon as it becomes 
available. We might think of an online system as well. Unfortunately the 
method depends on having beam data; cosmic data is not useful for this 
purpose.


      DTOFHitFactory

Beni has been looking at the code. He sees that there is a configuration 
parameter that can be set to analyze cosmic data, that could change 
values. Aristeidis implemented this branch of analysis in the early 
installation and testing weeks. We need to evaluate whether we want to 
continue to maintain it.


      Energy Calibration

Beni continues to look at attenuation and gain calibration issues.

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  * This page was last modified on 9 September 2015, at 10:12.


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