[Halld-pid] Start Counter Meeting Minutes, July 9, 2020

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_July_9,_2020#Minutes> 
and below.

   -- Mark


    GlueX Start Counter Meeting, July 9, 2020, Minutes

Present: Rupesh Dotel, Tolga Erbora, Mark Ito (chair), Susan Schadmand, 
Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/67M04xOA9FW/> on the BlueJeans site. Use your 
JLab credentials to gain access.


      Announcements

Beni has turned on the start counter and taken a cosmic ray run. I quick 
glance at the data showed the start counter data missing, but this needs 
confirmation and review of the DAQ configuration.


      Review of minutes from the last meeting

We went over the minutes from June 25 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_25,_2020#Minutes>. 


Fernando wrote a message to the email list 
<https://mailman.jlab.org/pipermail/halld-pid/2020-June/001726.html> on 
possible replacement of the SiPMs. He thinks it is marginally easier to 
replace a whole board rather than replacing individual SiPMs (12 per 
board). He also pointed out that we have a couple of spare units in hand.

Beni asked if the SiPMs are the same as those used for the pair 
spectrometer. Mark will check.


      Run Readiness

Beni is getting ready to check signals and pedestals in preparation for 
Hot Check-out and the run.


      Calibration and Efficiency

Werner Boeglin has asked Rupesh to look at the ADC response of the start 
counter in light of the possible degradation of timing resolution during 
the course of the last run. We spent some time going over how this might 
be done. Rupesh showed plots from a plugin that Mahmoud Kamel pointed 
out to him that plots ADC spectra for individual channels.


      Action Item Review

 1. Document calibration procedure (Rupesh)
 2. Reproduce Beni's dark current results. (Tolga)
 3. Check status of the gain calibrations using monitoring histograms.
    (Rupesh, Beni)
 4. Revisit Yi's study of SiPM annealing. (Mark, Beni)
 5. Ask about the current recommendation from SciComp on copying files
    to the local disk from cache before analyzing them. (Mark)
 6. Look up type of SiPMs used in start counter. (Mark)

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  * This page was last modified on 9 July 2020, at 15:11.

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