Date post: | 19-Dec-2015 |
Category: |
Documents |
View: | 220 times |
Download: | 3 times |
First results from GEM-based Calorimeter prototype for the Linear
Collider
A.White 4/28/03
(for J.Yu, J.Li, M.Sosebee, S.Habib, V.Kaushik)
UTA GEM Prototype
- Double GEM detector constructed using 10x10 cm2 foils from CERN.
- Single 1x2 cm2 anode pad.
- Charge preamp, then voltage amp. Used
- Cosmic trigger, small counters, low rate!
- Signal verification: no signal with (a) trigger counters displaced from anode pad, (b) air in GEM detector.
GEM/MIP signal size- Double GEM – apply 426V/stage
-Ionization ~30 i.p./cm => 10 e- / MIP
- GEM Gain. (G)
- Charge preamp sensitivity 0.25 V/e- (GC)
- Voltage amp. X10 (GV)
- Output signal = C x G x GC x GV
-Observe ~160mV signal (mean of Landau)
- => G = 6400 ± 20%
Conclusions
- Prototype GEM detector for digital calorimeter sensitive layer has been successfully constructed at UTA.
- GEM gain ~6400 for 426V across foils.
- Many noise reduction/grounding schemes studied.
- Single channel studies so far – next step: extend to multi-pad anode on layered readout board.