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This document outlines the specifications and design concepts for the Cerenkov detector in the BigBite spectrometer at 30 degrees for the 12 GeV A1n commissioning experiment at Hall A. The goal is to achieve good PID in a noisy environment by employing a new design with a large array of 0.75'' diameter PMTs, low threshold, and high single rate detection. The detector aims to find timing clusters of around 20 PMTs using TDC spectrum with a timing cut of approximately 10 ns to handle a background rate of 2MHz. The document also compares the Cerenkov geometry in top, azimuthal, and event views.
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Preliminary Geometry of Cerenkov Detector for New BigBiteSpetrometer Bo Zhao College of William and Mary Hall A weekly meeting, March 22, 2011 1
Specification of Cerenkov BigBite is at 30 degs for 12 GeV A1n, the commissioning experiment for Hall A at 6.6 and 8.8 GeV. Need good PID in noisy environment. New design concept Large array of 0.75’’ diameter PMTs Low threshold, high single rate Find timing clusters of ~20 PMTs using TDC spectrum Timing cut ~ 10 ns Expect to handle 2MHz high background rate. 2
Cerenkov Geometry I(top view) 2nd GEM Tank Beam Mirror 3He 30o BB magnets PMT array 4
Cerenkov Geometry II(top view) 2nd GEM Tank Beam Mirror 3He 30o BB magnets PMT array 7
