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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...
Gas Proportional Scintillation Counter with Xenon and Xenon Mixtures
Conde, C. A. N.; Policarpo, A. J. P. L.; Alves, M. A. F.The light output of the recently developed gas proportional scintillation counter - a gas scintillation counter with light multiplication produced by a cylindrical geometry electric field - is investigated for heavy gaseous media under alpha particle excitation with a 56 UVP phototube. The gases used are Xe, and Xe-Ar and Xe-N2 mixtures for a wide range of concentrations, at a total pressure of about 965 Torr. ...
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