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

Meeting ID: 965 514 9233

Passcode: 1693

Agenda

1. Trigger Scintillator status
2. Rotator status
3. GEM design updates, gas flow

Attendance

David A, Bhasitha D, Chandika A, Klaus D, Ryan B, Vladimir B

Minutes

1. We will get an update from Rakitha on the Trigger Scintillator next week. Chandika needs a newer version of the TS holder design to incorporate into Rotator CAD.
2. (Chandika) Has found a new lead-screw based linear actuator for the radial motion; this would avoid the need for brakes for the radial motion - good! Stainless steel drive screws, so should be OK.
3. (Bhasitha) Working on design changes to reduce how far out the gas connectors stick, to avoid interference with GEM rotator.
4. (David) Asks Bhasitha about the total needed gas flows for the GEMs. We need 5 complete flushes per hour; Bhasitha will check the numbers and get back to me (post meeting answer: The internal volume of each MOLLER chamber is ~2.1 cubic decimeters. What we require is about 5 gas volume changes per hour. So the requirement is ~0.011 cubic meters per hour per single chamber, so for the system of 28 tracking detectors this is 0.308 cubic meters per hour. But I think it's better to have some safety margin and set up for a bit higher flow requirement if possible. Also need to include the polarimeter GEMs).
5. (Klaus) Asks Bhasitha if he can investigate simplifying gas system by only having one outlet per chamber, rather than the 5 of the present design. Will work on this.