Title :
Transition condition to the SQS mode of gas counters for heavy charged particles
Author :
Nohtomi, A. ; Sakae, T. ; Matoba, M. ; Koori, N.
Author_Institution :
Dept. of Nucl. Eng., Kyushu Univ., Fukuoka, Japan
Abstract :
Self-quenching streamers (SQSs) induced by charged particles in gas counters are classified into two types on the basis of their formation mechanisms: photo-mediated SQS and ionization-track induced SQS. The transition condition of α-ray induced SQS has been investigated as a typical example of the ionization-track induced SQS by heavy charged particles. For this purpose, obtainable experimental data are compiled and reanalyzed. An effective electric field, Eeff, and average electron density of an α-ray ionization track, ρav, are newly introduced and examined with that data. A result of the analysis indicates that the SQS transitions may occur when Eeff·ρav reaches a certain value. Following this, the transition characteristics to the SQS mode for protons around 10 MeV are investigated through an experiment
Keywords :
electron density; ionisation; particle tracks; streamer chambers; α-particle; 10 MeV; Eeff; SQS mode; charged particles; effective electric field; electron density; gas counters; heavy charged particles; ionization track; ionization-track induced SQS; photo-mediated SQS; protons; self-quenching streamers; transition condition; Art; Counting circuits; Delay; Electron optics; Head; Ionization; Particle tracking; Protons; Radiative recombination; Streaming media;
Conference_Titel :
Nuclear Science Symposium, 1996. Conference Record., 1996 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
0-7803-3534-1
DOI :
10.1109/NSSMIC.1996.591053
