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Polarimeter Detectors for 12 GeV Hall C GEn measurements

Polarimeter Detectors for 12 GeV Hall C GEn measurements. Experiment E12-11-009 Jlab Collaboration Meeting 22 October 2013. A. Semenov, 2012 Geometry. Plan A (100 cm detectors). Plan B (160 cm detectors). Detectors needed for proton-recoil polarimeter.

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Polarimeter Detectors for 12 GeV Hall C GEn measurements

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  1. Polarimeter Detectors for 12 GeV Hall C GEn measurements Experiment E12-11-009 Jlab Collaboration Meeting 22 October 2013

  2. A. Semenov, 2012 Geometry

  3. Plan A (100 cm detectors)

  4. Plan B (160 cm detectors)

  5. Detectors needed for proton-recoil polarimeter 28 scatterers   10 x 10 x 100 cm 56 Up & Down Detectors 56 + 28 = 84 Detectors

  6. Detectors Available • Neutron Detectors:32   10 x 10 x 100 cm  in HAND • 2 10 x 10 x 100 cm at KSU34   4 x 5 x 40 in  in HAND • 68 Total • ~80 10 x 10 x 160 cm from Hall A GEn • So need 16 more 10 x 10 x 100 cm for Plan A • Plan B OK, using the 160 cm detectors • Additionally, there exists: (could be cut and machined) 8     4 x 20 x 40 in      detectors at KSU3     4 x 10 x 40 in      detectors at KSU • 4 x 10 x 40 in detectors in HAND • 16 10 x 22.5 x 400 cm detectors from BLAST • Veto Detectors: 22 (Hall C) + 24 (Hand) + ??

  7. Electronic Channels needed Plan A: 28 scatterers + 28 up/dn detectors 2 ends/det = 112 channels Plan B: 28 scatterers + 56 up/dn detectors 2 ends/det = 168 channels Plus Vetoes

  8. Phototubes and Magnetic Shields All existing detectors have PMTs and Mag Shields However, many of the PMT’s are old or known to not be “good.” The 10 x 10 x 100 cm detectors have 2-in PMTs The 4 x 5 x 40 in detectors have 5-in PMTs

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