Abstract
Efficiency characteristics of parallel plate spark chambers were previously studied experimentally as a function of pulse voltage and argon pressure in the range 5–760 torr. Theoretical explanations of the efficiency curves obtained therefrom are considered in the present work in the frame-work of the avalanche-streamer model of gas discharge suitably modified in the region of low pressure. We obtain separate expressions for efficiencies of defined sparks and glow type discharges in the spark chambers which fairly agree with the experimental curves. We conclude that glow discharges are initiated only when the effective number of seed electrons in the chamber gap does not exceed 2 per cm. It also appears that the clustering effect plays a significant role only in the case of defined sparks in argon and not in helium.
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