Abstract
We have constructed and tested a threshold Cherenkov detector inspired by the conceptual design of Giomataris and Charpak (Nucl. Instr. and Meth. A 310 (1991) 589). The basic design consists of a gas radiator followed by a photosensitive wire chamber using a solid Csl photocathode. The photon detector lies directly in the particle path and is required to have single photo-electron sensitivity and yet be insensitive to the passage of a charged particle. We have altered the design by adding a thin LiF window. This window allows one to separate the radiator and avalanche volumes, giving greater flexibility in the gas choices. Our detector was operated with C 2F 6 as the radiator gas at lengths of 120, 80, and 40 cm. The avalanche gas was 95%He + 5% CH 4. At 95% electron efficiency, the pion efficiency was 1 333 , 1 150 , and 1 100 for each of the lengths listed above.
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