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

doi:10.1016/j.nima.2005.04.058

arXiv · physics/0411147

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

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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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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. 2004-11-16. The aerogel threshold Cherenkov detector for the High Momentum Spectrometer in Hall C at Jefferson Lab. https://doi.org/10.1016/j.nima.2005.04.058

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