[Halld-pid] Start Counter Meeting Minutes, October 29, 2020

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_October_29,_2020#Minutes> 
and below.

   -- Mark

_______________________


    GlueX Start Counter Meeting, October 29, 2020, Minutes

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

The main item of discussion was Beni's report on what he has gleaned 
thus far from the paper by Qiang, Zorn, Barbosa, and Smith on Radiation 
Hardness Tests of SiPMs for the JLab Hall D Barrel Calorimeter 
<https://halldweb.jlab.org/talks/2020/SiPM_Radiation_Hardness_Final.pdf>

  * The authors conclude that SiPMs in the BCAL will last for the
    lifetime of GlueX.
  * They do not address the situation for the start counter, so the
    question is if we can assess the neutron flux and/or radiation to
    the SiPM so much nearer the beam line.
  * Beni has doubts about whether we can measure dark current in situ in
    the Hall.
  * The asymptotic level of recovery from annealing is better at higher
    temperature.
  * There is no history of annealing encoded in the SiPMs; an annealing
    session at low temperature does not adversely affect a later session
    at a higher temperature.


      Action Item Review

 1. Document calibration procedure (Rupesh)
 2. Reproduce Beni's dark current results. (Tolga)
 3. Continue to revisit Yi's study of SiPM annealing. (Mark, Beni)
 4. Look up type of SiPMs used in start counter. (Mark)


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-pid/attachments/20201030/17d48325/attachment.html>