Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10716074 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 11 Pages |
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 Ï/K/p, which was achieved by installing an additional threshold Cherenkov counter. Two types of aerogel with n=1.030 and n=1.015 allow one to reach â¼10-3 proton and 10-2 kaon rejection in the 1-5Â 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 photo multiplier tubes (PMTs). The mean number of photo-electrons in saturation was â¼16 and â¼8, respectively. This allows even for separation of slower particles slightly above threshold.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
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,