Book Synopsis The Aerogel Threshold Cherenkov Detector for the High Momentum Spectrometer in Hall C at Jefferson Lab by :
Download or read book The Aerogel Threshold Cherenkov Detector for the High Momentum Spectrometer in Hall C at Jefferson Lab written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.