Study of photosensitive mixtures of TMAE and helium , hydrocarbon or CF 4 - based carrier gases

Abstract

Among the photocathodes used for particle identification based on the Cherenkov Ring Imaging technique, the TMAE molecule is still the best in terms of quantum efficiency. Despite the fact that TMAE gaseous photocathodes have already been used in a number of large experiments, one still seeks answers to many detailed questions. We present a systematic study of gaseous photocathodes based on TMAE mixed with helium, hydrocarbon and CF4-based gases at normal pressure. The study includes a measurement of the electron drift velocity, gas quenching properties, single electron pulse height spectra and anode wire aging. The paper makes recommendations for carrier gas mixtures to obtain the best quenching, and suggests how to manage TMAE wire aging. This study was motivated by a specific particle identification detector proposal, the Fast Drift CRID proposed for the B-factory at SLAC. Submitted to Nuclear Instruments and Methods The work was supported by the Department of Energy contract DE-AC03765SF00515. * Present address : Sandia National Labs, P.O. Box 5800, Albuquerque, NM 87185, U.S.A. 2

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Cite this paper

@inproceedings{Kadyk1999StudyOP, title={Study of photosensitive mixtures of TMAE and helium , hydrocarbon or CF 4 - based carrier gases}, author={S . A . J . Kadyk and Joshua Wise}, year={1999} }