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Transient behaviour and rate effects in resistive detectors
Fraga, M. M.; Marques, R. Ferreira; Ivaniouchenkov, Y.; Lima, E. P. de; Neves, F.; Policarpo, A. J. P. L.; C. Bueno, Carmen; Gonçalves, Josemary A. C.The dependence of the detection efficiency (or charge gain) of a resistive detector on the counting rate has been considered by several authors. The influence of the resistivity of the electrodes, the counter geometry and the gas mixture composition have also been studied. Most of those measurements assume a stationary regime. In the present work we report on studies of the transient behaviour of detectors with...
Dead Region Time Evolution and Afterpulses Development in SQS
Lima, E. P. de; Salete, M.; Leite, S. C. P.; Policarpo, A. J. P. L.; Alves, M. A. F.The dead length, 6, for t > 20 ms is well approximated by d=d0 exp(-t/t) for mixtures of argon-isobutane with benzene or TEA. d0 varies in an approximate linear way with the streamer charge and the systematics of t regarding the high voltage is also presented. Afterpulses are associated not only with wall effects but also with photoionization in the gas mixture itself. Interpretation of the data is attempted
Self-Quenching Streamers in Mixtures with Photoionization Vapours
Lima, E. P. de; Salete, M.; Leite, S. C. P.; Policarpo, A. J. P. L.; Alves, M. A. F.The basic properties of self-quenching streamers in a proportional counter with a thick anode wire are investigated. In particular, the influence of mixing benzene and triethylamine to argon-isobutane mixtures is studied regarding thresholds for streamer production, pulse shapes and dead time. There is a lowering of the high voltage threshold for streamer production associated with low concentrations of triethy...
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