[Halld-jlab] Hall D Staff Meeting Notes, July 25, 2016

[Mark Ito]

Folks,

Please find the notes below and at 
https://halldweb.jlab.org/wiki-private/index.php/Hall_D_Staff_Meeting,_July_25,_2016 
.

   -- Mark

_______________


  Hall D Staff Meeting, July 25, 2016

 From Gluex PRIVATE Wiki

Present: Alexander Austregesilo, Eugene Chudakov, Alexandre Deur, 
Hovanes Egiyan, Sergey Furletov, Mark Ito, David Lawrence, Lubomir 
Pentchev, Elton Smith, Sascha Somov, Justin Stevens, Simon Taylor, Tim 
Whitlatch, Zhenyu Zhang, Beni Zihlmann

Eugene brought us up to speed on two reviews that were conducted last 
week. To run during Spring 2018, experiments need to apply for beam time 
by August 1.


    PrimEx Readiness Review

  * Collaboration applied for grant to build Compton Calorimeter, $2k.
    Grant denied.
      o Backup plan: put HyCal from Hall B behind FCAL platform.
      o Need 400 channels, up from 100 for the Compton Calorimeter.
  * Want hydrogen and helium 4 targets
      o requested target length for helium known to 0.5%, need
        superfluid, requires one FTE to develop.
  * Experiment told to come back in a year, aim for running in Fall 2018.
      o Next time need to be better prepared.


    GlueX 2, Level 3

  * Not a formal review, local panel
  * Level 3 needed to go up in rate factor of 5
  * event size grows with intensity
      o factor of three bigger
      o too high for crate read-out, especially FDC
      o tagger read-out windows can be reduced
      o need a factor of 2
      o will try to get it from level 1 trigger
      o crates read-out can be improved some by going to 10 Mb Ethernet
        from 1 Mb, will hit bus limitation
      o need to study trigger efficiency
      o what is effect of halving the rate on the current data?
  * post read-out processing
      o size of L3 depends on effect of higher rate on processing time
      o hard to extrapolate current data to higher rate
      o could write all events to disk; process near-online. get to use
        any beam downtime
      o by Aug. 1: would like to look at a lower rate trigger scheme
        with reasonable efficiency

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-- 
marki at jlab.org, (757)269-5295

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