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Abstract:
Some performances of an adjustable field drift chamber operated in the self-quenching streamer mode (SQS) have Been measured. The counting rate plateaus as a function of threshold and gas mixture, the efficiency, the spacil resolution, the relationship between drift distance and drift-time, the pulse heights in different drift distance and the transition characteristics from saturated avalanche to SQS-discharge mode are presented in this paper. The influences of the benzene vapor are also studied.
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