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Preliminary Geometry of Cerenkov Detector for New BigBite Spetrometer

Preliminary Geometry of Cerenkov Detector for New BigBite Spetrometer. Bo Zhao College of William and Mary. Hall A weekly meeting, March 22, 2011. 1. Specification of Cerenkov.

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Preliminary Geometry of Cerenkov Detector for New BigBite Spetrometer

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  1. Preliminary Geometry of Cerenkov Detector for New BigBiteSpetrometer Bo Zhao College of William and Mary Hall A weekly meeting, March 22, 2011 1

  2. 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

  3. HERMES RICH detector (half) 3

  4. Cerenkov Geometry I(top view) 2nd GEM Tank Beam Mirror 3He 30o BB magnets PMT array 4

  5. Cerenkov Geometry I(azimuthal view) 5

  6. Cerenkov Geometry I(event view) 6

  7. Cerenkov Geometry II(top view) 2nd GEM Tank Beam Mirror 3He 30o BB magnets PMT array 7

  8. Cerenkov Geometry II(side view) 8

  9. Cerenkov Geometry II(event view) 9

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