Tracking Meeting Mar 2 2023 1:00PM ET

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Zoom link: https://cwm.zoom.us/j/9655149233?pwd=b2I1cXZUakN0Q2tFK0w0QVdmajkzZz09

Meeting ID: 965 514 9233

Passcode: 1693

Agenda

1. (Rakitha) Trigger Scintillator Status [1]
2. (Bhasitha) GEM design tweaks

Attendance

David A, Bhasitha D, Klaus D, Chandika A, Rakitha B, Ryan B, Nilanga L, Vladimir B, Carl Z

Minutes

1. (Rakitha) GEANT 4 simulation with 7 parallel WLS fibres, ground (diffuse) scintillator surface, with 99% reflecting Mylar wrap (air gap, doesn't whet scint surface) shows >99.9% efficiency (for > 3 PEs within 10 ns) over entire scintillator. Discovered that original bench studies (rectangular scint, 2 fibres only) used 90% reflectivity mylar; results markedly improved when 99% reflectivity mylar was used instead. Next prototype will try using carbide powder to make surface diffuse. Carl suggest trying a diffuse reflector such as Tyvek (he has a roll in his office) and leaving optically flat scintillator surface. Suggested that Rakitha order two trapeziodal prototypes next. # (Rakitha) Scintillator frame has only been slightly modified from earlier version which used light guide readout; will send latest CAD to Chandika to incorporate in Rotator design.
2. (Rakitha) Probably will use SHV connectors (as opposed to MHV or HV-lemo).
3. (Bhasith) Will show updates on GEM design (gas connections) next week, after first talking with Nilanga.