Difference between revisions of "December 09, 2021"

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[https://moller.jlab.org/wiki/index.php/Gem_Detector_System Back to GEM @ Stonybrook page]
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== Meeting Information ==
 
== Meeting Information ==
 
GEM @ Stonybrook Meeting<br>
 
GEM @ Stonybrook Meeting<br>
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3:30 pm, ET<br>
 
3:30 pm, ET<br>
  
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== Connection Using Bluejeans ==
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== Project background ==
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<!--
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# Klaus' slides on the Moller GEM is to be added here for reference.  
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# To join via Polycom room system go to the IP Address: 199.48.152.152 ([http://bjn.vc bjn.vc]) and enter the meeting ID: 846453895.
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# Stonybrook is assigned to construct 12 out of the 28 layers of GEM trackers for the Moller experiment
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# To join via a Web Browser, go to the page [https://bluejeans.com/846453895] https://bluejeans.com/846453895 .
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# Two prototype trackers to be constructed by late 2022. GEM material (three rectangular sheets) will arrive SBU in early March; frames will arrive later
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# To join via phone, use one of the following numbers and the Conference ID: 846453895
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#* US or Canada: +1 408 740 7256 or
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#* US or Canada: +1 888 240 2560
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# More information on connecting to [[Connect to the Data Challenge Meetings|bluejeans]] is available.
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--!>
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== Agenda ==
 
== Agenda ==
  
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# Announcements
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# Kicking off the GEM work planning at Stonybrook.
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# Hardware work (All)
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#* Latest inspections of mirror prototypes (Bill)
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== Meeting Summary ==
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#** [https://logbooks.jlab.org/entry/3934273 October 26th inspection and water changeout]
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# Sub-tasks (required volunteers, or will be assigned):
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# Review of 2020 studies (All)
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#* Preparation stage:
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#* [https://halldweb.jlab.org/wiki-private/index.php/Spring_2020_Dataset_Summary#Full_REST_Production Spring and Summer 2020 data production status] all complete but ongoing issues with tape and [https://halldweb.jlab.org/wiki-private/index.php/Spring_2020_Analysis_Launch Analysis launches]
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## Clearing out a perimeter in the basement lab (Bill, Vassu, Weibing).
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#* Geometric reconstruction update (Roman)
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## setting up the cleanroom. (Klaus, Bill and others)
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#* Simulation needs:
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## Setting up the latest JLAb DAQ system: CODA, and configure it to be used for calibrating the prototype GEM trackers (Bill)
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#** Ad-hoc reduction in photon yields (in mcsmear) to match data: until mirror reflectivity dependence on incident angle is implemented
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## Looking at parsing BigBite data to understand the expected performance.
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#** Tagged version of halld_sim with any updates (version set compiled against [https://github.com/JeffersonLab/halld_recon/releases/tag/4.16.2 halld_recon 4.16.2] used in data production)
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## Simulation to get expected GEM response? (Not a priority right now)
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#** Others
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## Communicate with machine shop to make a stand for hosting the manufactured prototype based on the CAD drawing (Bill)
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#* Action items (from previous meetings)
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#* Manufacturing stage:
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#** [https://github.com/JeffersonLab/HDGeant4/issues/191 Add incident angle dependence to mirror reflectivity]
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## Manufacturing/stretching GEM sheet and mount to bracket (with glue) inside the cleanroom (Klaus and Prakhar) 
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#** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=5286 Global alignment issues] see slide 15-18 of CM talk (All)
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#* Calibration stage:
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#*** Early studies of [https://halldweb.jlab.org/wiki/index.php/FDC_tilt/alignment_update FDC tilt]
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## Operating X-ray gun in in grid and mapping out the efficiency and gain in each sector of the GEM response: efficiency, uniformity, gain, etc (Bill & others)
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#*** Possible rotation of magnetic field: impact on extrapolations to DIRC? 
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#*** Generate MC with rotated field and reconstruct with nominal?
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#** Reducing background contamination in pi/K samples: KinFit &Delta;&chi;<sup>2</sup> between 2pi and 2k reactions, robust sideband subtraction
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#** [https://github.com/yunjie-yang/FastDIRC4GlueX FastDIRC documentation] (Yunjie)
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# AOB
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== Additional equipment ==
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#* Cleanroom
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#* Gas system? CO2 and Helium mixture.
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#** How good does the mixture have to be? Does the mixture ratio matter?
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#* X-Ray gun mounted on arms that move in small stepped

Latest revision as of 22:18, 9 December 2021

Back to GEM @ Stonybrook page


Meeting Information

GEM @ Stonybrook Meeting
Wednesday December 08, 2021
3:30 pm, ET

Project background

  1. Klaus' slides on the Moller GEM is to be added here for reference.
  2. Stonybrook is assigned to construct 12 out of the 28 layers of GEM trackers for the Moller experiment
  3. Two prototype trackers to be constructed by late 2022. GEM material (three rectangular sheets) will arrive SBU in early March; frames will arrive later

Agenda

  1. Kicking off the GEM work planning at Stonybrook.

Meeting Summary

  1. Sub-tasks (required volunteers, or will be assigned):
    • Preparation stage:
    1. Clearing out a perimeter in the basement lab (Bill, Vassu, Weibing).
    2. setting up the cleanroom. (Klaus, Bill and others)
    3. Setting up the latest JLAb DAQ system: CODA, and configure it to be used for calibrating the prototype GEM trackers (Bill)
    4. Looking at parsing BigBite data to understand the expected performance.
    5. Simulation to get expected GEM response? (Not a priority right now)
    6. Communicate with machine shop to make a stand for hosting the manufactured prototype based on the CAD drawing (Bill)
    • Manufacturing stage:
    1. Manufacturing/stretching GEM sheet and mount to bracket (with glue) inside the cleanroom (Klaus and Prakhar)
    • Calibration stage:
    1. Operating X-ray gun in in grid and mapping out the efficiency and gain in each sector of the GEM response: efficiency, uniformity, gain, etc (Bill & others)

Additional equipment

    • Cleanroom
    • Gas system? CO2 and Helium mixture.
      • How good does the mixture have to be? Does the mixture ratio matter?
    • X-Ray gun mounted on arms that move in small stepped
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