[Halld-pid] Start Counter Meeting Minutes, August 22, 2019

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_August_22,_2019#Minutes> 
and below.

   -- Mark

_________________________________________________________________


    GlueX Start Counter Meeting, August 22, 2019, Minutes

Present:

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

There is a recording of this meeting <https://bluejeans.com/s/mKeiP> on 
the BlueJeans site. Use your JLab credentials to authenticate.


      Review minutes from the last meeting]]

We went over the minutes of the meeting on June 13 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_13,_2019#Minutes> 
without significant comment.


      SiPM Dark Rate Studies

Beni led us through his recent note, GlueX-Doc-4138 
<https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4138>. 
Please see his note for all of the details.

  * Data was taken with beam off, sparsification turned off (raw mode)
    using random triggers at 2 kHz. The read-out window was set to 100
    samples.
  * Average pedestal values for each set of four samples in the window
    (25 measurements per event per channel) are histogrammed and the low
    side of the pedestal peak is fit to a Gaussian. Then the total
    integral of the distribution is compared to the area under the
    Gaussian. The ratio of Gaussian area to total area is plotted for
    four data-taking runs spanning the PrimEx run period.
  * There is a 5% decrease of the ratio over the course of the run period.
  * Beni proposes that we make these measurements a standard part of all
    future running. Rupesh volunteered to oversee the operation
    including data analysis.

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  * This page was last modified on 22 August 2019, at 11:40.

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