Quadrants summary

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Good quadrants, complete or in progress:

-Quadrants 7-11, and 13 (6 quadrants) are at BNL.

-Quadrants 15 & 17 are finished, have tested well, and are here at Bates ready to go to BNL.

-Quadrant 18 is in the D lab, having been flushed with gas (must have been gas-sealed?), ready for HV-testing.

-Quadrant 19 has a blockage causing a gas flow problem. Jason has a theory about how to fix it. 

-After stopping building quadrant 12 when the first GEM layer didn't pass testing, we cleaned the exposed side of the GEM and it tested well. We glued the second GEM layer and successfully HV-tested the quadrant a few days ago; we glued the GEM + RDO yesterday.

-We've glued two GEM layers on quadrant 20. We started HV-testing it yesterday, but one layer was slow; we finished testing today. We're pinning a GEM + RDO for it today. As soon as we finish HV-testing the GEM + RDO, assuming it tests well, we'll be able to glue it to to quaudrant 21.

-We glued the pressure foil, HV foil and first GEM foil on quadrant 21 yesterday. We might get to HV test it today.

This gives us eight completed quadrants, three more fully assembled, and two more partially assembled.

Problematic quadrants that we've put aside:

-Quadrants 1-6 wouldn't hold the voltage; this is why we introduced the spacer grids in the subsequent quadrants. Some people have speculated that these might function with some extra care in ramping up the HV, but we've put any work with them on hold. I wondered whether, since we'll have the extra space, installing some number of these extra quadrants might be worthwhile. Just thought I'd get people to consider the question.

-We completed quadrant 14, but some parts of the readout board delaminated. We haven't been able to recover it.

-We damaged the second GEM layer in quadrant 16 by putting too thick a spacer grid on it for gas flushing and HV-testing, so we stopped building it.