Internally reflecting Čerenkov counter for high energy protons

Abstract

A high energy proton detector is described, which utilises multiple internal reflections of Čerenkov radiation to achieve a sharp energy threshold. The detector is capable of accepting a charged particle beam of cross section comparable to that of the radiator. A preliminary version of the counter has been studied experimentally in the 500–900 MeV proton energy range. The performance of the detector agrees with that expected, when allowance is made for various factors which limit the resolution.