Update on GEM-based DHCAL

for SiD

Andy White

For GEM/DHCAL Group

September 21, 2005

- 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

Fermilab beam chamber

Fermilab beam chamber

DGEM

DGEM

DGEM

DGEM

DGEM

Cosmic stack using Double GEM counters

(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.

3M GEM foil design

HV tabs to be longer

First 30cm x 30cm 3M GEM foils

First 30cm x 30cm 3M GEM foils

Section of 30cm x 30cm 3M GEM Foil

A piece of fiber inside the hole on uncoated GEM

A piece of fiber inside the hole on uncoated GEM

Tooling for mounting GEM foils on G10 frames

G10 Frame 30cm x 30cm

G10 Frame 30cm x 30cm