The aerogel threshold Cherenkov detector for the High Momentum Spectrometer in Hall C at Jefferson Lab
R. Asaturyan, R. Ent, H. Fenker, D. Gaskell, G. M. Huber, M. Jones, D. Mack, H. Mkrtchyan, B. Metzger, N. Novikoff, V. Tadevosyan, W. Vulcan, S. Wood
Abstract
We describe a new aerogel threshold Cherenkov detector installed in the HMS spectrometer in Hall C at Jefferson Lab. The Hall C experimental program in 2003 required an improved particle identification system for better identification of pi/K/P, which was achieved by installing an additional threshold Cherenkov counter. Two types of aerogel with n=1.03 and n=1.015 allow one to reach 10-3 proton and 10-2 kaon rejection in the 1-5 GeV/c momentum range with pion detection efficiency better than 99% (97%). The detector response shows no significant position dependence due to a diffuse light collection technique. The diffusion box was equipped with 16 Photonis XP4572 PMT's. The mean number of photoelectrons in saturation was ~16 and ~8, respectively. Moderate particle identification is feasible near threshold.
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