GEM Meeting/20190419

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Logistic information

 BlueJeans calling instructions:
 Toll-Free Number (U.S.&  Canada):  888-240-2560
 International toll number:         408-740-7256
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Agenda

• Chandan: Test Lab update slides

Minutes

• Chandan: There is problem with voltage rating of the registors used for the GEM voltage divider. Proposing to change the resistors with better resistors.
  • Seamus & Dustin: May be risky. Chandan should go ahead and make the circuit ready. We will go ahead and use the existing voltage divider (since they are used for more than one year). If problem arises we can change the voltage divider.
    • Chandan: We will have enough HV channels (which can provide upto 1 mA) to use the CERN standard voltage vidider.

• Chandan: GEM efficiencies for four GEM detectors are presented. GEM-3 (x-projection) shows some inefficiencies (may be due to bad pedestal values)
  • Seamus: Should try to play with the offset parameters,
• Siyu: Mouted GEM detectors for one arm. Working on the other arm. Will flow N2 and Ar-CO2 through the chamber soon. Apply HV in presence of Kondo next week. Will also work on DAQ.
• Seamus: Working on optics code (using SBS-offline and TreeSearch). It is close to working. Will handover to Ye Tian to build the database and channel map.
• Ryan: Will modify the SBS GEM stand in CAD and will work for unified-CAD.

Present

Dustin, Seamus, Ye Tian, Devi, Dustin, Cameron, Ryan, Chandan