Gas avalanche pixel detectors
- Lawrence Berkeley National Lab., CA (United States)
We describe the structure and avalanche gain of microstrip pixel detectors. Each anode is a square 20 {mu}m x 20 {mu}m in size connected to an individual pad through a plated center section. The cathodes are plated squares interconnected to a common lead. The anode, squares have a pitch of 200 {mu}m in both x- and y- directions. The anodes and cathodes are aluminum layers deposited on amorphous silicon alloyed with carbon (a-Si:C:H) to produce a bulk resistivity of {approximately}10{sup 13} {Omega}cm. Measurements on signals from a group of anodes shows an avalanche gas gain close to 104 at a cathode-anode potential of 640 volts using a gas mixture of 50/50 argon-ethane. The avalanche gain is a factor of 3 higher than that of a same pitch microstrip device. For our initial measurements, 16 anodes were connected together to a charge sensitive preamplifier. In a final chamber each anode would be connected to a readout a-Si:H p-i-n diode and signals read out sequentially as in flat screen devices.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 513066
- Report Number(s):
- CONF-961123-; TRN: 97:014118
- Resource Relation:
- Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Anaheim, CA (United States), 2-9 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 IEEE nuclear science symposium - conference record. Volumes 1, 2 and 3; Del Guerra, A. [ed.]; PB: 2138 p.
- Country of Publication:
- United States
- Language:
- English
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