1. Update on GEM-based DHCAL for SiD Andy White For GEM/DHCAL Group September 21, 2005

2. - We have received new 30cm x 30cm foils from 3M Corporation - Some initial problems with surface – mositure trapped -> now cured - HV (~400V) tests on all 12 strips/foil - Now tooling up to build 5 30cm x 30cm chambers - Foils also being sent to 5 other institutions in U.S., Canada, China, Korea for evaluation. - 20 QPA02-based preamp cards made at Fermilab. Recent activities

3. Fermilab beam chamber DGEM Cosmic stack using Double GEM counters

4. (10 x 10) – 4 active area = 96 channels Trace edge connector -> Fermilab 32 ch board 305mm x 305mm layer Disc/DAQ under design by U.W.

5. 3M GEM foil design HV tabs to be longer

6. First 30cm x 30cm 3M GEM foils

8. Section of 30cm x 30cm 3M GEM Foil

9. A piece of fiber inside the hole on uncoated GEM

11. Tooling for mounting GEM foils on G10 frames

12. G10 Frame 30cm x 30cm