The aerogel threshold Cherenkov detector for the High Momentum Spectrometer in Hall C at Jefferson Lab

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.

arXiv comment18 pages, 12 postscript figures

References in corpus (3)

• Study of a Threshold Cherenkov Counter Based on Silica Aerogels with Low Refractive Indices
• Development of a Large-Area Aerogel Cherenkov Counter Onboard BESS
• The AMS-01 Aerogel Threshold Cherenkov counter

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• Measurement of Nuclear Transparency for the A(e,e' pi^+) Reaction
• Semi-Inclusive Charged-Pion Electroproduction off Protons and Deuterons: Cross Sections, Ratios and Access to the Quark-Parton Model at Low Energies
• Study of the A(e,e'${\pi }^{+}$) Reaction on ${}^1$H, ${}^2$H, ${}^{12}$C, ${}^{27}$Al, ${}^{63}$Cu and ${}^{197}$Au
• The Onset of Quark-Hadron Duality in Pion Electroproduction
• The Aerogel Cherenkov Detector for the SHMS magnetic spectrometer in Hall C at Jefferson Lab
• Nuclear transparency and effective kaon-nucleon cross section from the A(e, e'K+) reaction