Abstract
Calorimeters using high pressure gas as active medium are now being considered as candidates for the forward region of detectors at high luminosity colliders. A parallel plate electromagnetic calorimeter and a high pressure test vessel have been used to study and compare the response of Ar + CH 4, Ar + CF 4, Ar + C 2H 6, Xe + CH 4 and Xe + CF 4 gas mixtures to 50 GeV electrons and to alpha particles from an 241Am source. Results on the energy resolution, the electron drift velocity, and the collected charge as a function of electric field and gas pressure for the different gas mixtures are compared.
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