[Halld-pid] Start Counter Meeting Minutes, June 10, 2021

[Mark Ito]

People,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_10,_2021#Minutes> 
and below.

   -- Mark

      ____________________________________


    GlueX Start Counter Meeting, June 10, 2021, Minutes

Present: Eugene Chudakov, Sean Dobbs, Mark Ito (chair), Igal Jaegle, 
Simon Taylor, Tim Whitlatch, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/Az6OKsq8MyD/> on the BlueJeans site. Use your 
JLab credentials to gain access.


      Review of minutes from the last meeting

We went over the minutes from the meeting on March 18 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_18,_2021#Minutes>. 
In response to his inquiries, Mark received the Purchase Requisition for 
the Start Counter SiPMs from Sasha Somov and the specs of the devices 
from Fernando Barbosa.


      New mounting design for Start Counter

Igal presented an idea for mounting a new μRWELL detector outside the 
scattering chamber but inside the start counter to give better spatial 
resolution near the event vertex. He has been working with Simon Taylor, 
Sean Dobbs, Sergey Furletov, Stuart Ferguson[?], and Kondo Gnanvo. He 
focused on mechanical design considerations in his presentation. The 
current configuration of the start counter/target region would not 
accommodate cables for the detector. Igal proposes moving the start 
counter 15 cm downstream with respect to the target to open up space for 
cable penetrations. See his slides 
<https://halldweb.jlab.org/wiki/images/f/fc/Sc_meeting.pdf> for the 
details.

 From the discussion:

  * The effect on start counter rates of the move needs to be studied.
    We have scalar data for GlueX running in the EPICS archive. A test
    might be necessary to accurately assess the change. Simulation may
    give an answer as well.
  * Tim pointed out that it might be possible to lengthen the aluminum
    tube the connects holds the start counter and connects it
    mechanically to the target assembly. Igal pointed out that such an
    extension would need slots for cable penetration.


      Start Counter Use in the Upcoming Run

Beni pointed out that we need to find out if PrimEx and/or SRC have any 
plans for using the start counter.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-pid/attachments/20210610/b90ce926/attachment.html>