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U pstream P hoton V eto

U pstream P hoton V eto. GlueX Apparatus. UPV. Need for Hermitic Detection. Simulation studies show for reactions with photons emanating from the baryon decay vertex that approximately 10% of the photons miss detection by either the barrel calorimeter or the lead glass detector. Upstream

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U pstream P hoton V eto

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  1. Upstream Photon Veto GlueX Apparatus UPV

  2. Need for Hermitic Detection Simulation studies show for reactions with photons emanating from the baryon decay vertex that approximately 10% of the photons miss detection by either the barrel calorimeter or the lead glass detector. Upstream Hole GlueX Note #36 These gammas go undetected by escaping out the upstream hole.

  3. UPV A Soft-Iron Scintillator Sandwich Design • Regain magnetic field- shaping • Detect photons of energy >20 MeV • Multiple photon detection • Fast detection w/ timing information

  4. UPV Design 18 layers 1cm thick scintillator 12 layers 0.635cm thick iron (0.36X0) 6 layers 1.270cm thick iron (0.72X0) Total: 8.91X0

  5. R&D Prototyping for UPV • Construct Two Competing Veto Prototypes • Study the feasibility of using iron as a radiator instead of lead for low energy measurements • Instrument to test the building technique • Build infrastructure in place for future R&D w/ final goal of the construction of the UPV

  6. Machining & Milling

  7. Polishing & Wrapping

  8. Stacking Prototype #1

  9. Present State • Light guides • UVT strips ready for bending • Winston cones are being made • PMTs • ADIT B51D01 • Bases • ADIT Model 112-2

  10. Test DAQ VME VME to PC Bridge Linux DAQ

  11. Future Plans • Prototype Module #1 • Completion by end of year • Prototype Module #2 • Jan-Feb completion • Testing during spring • Initial cosmic ray studies • Possible JLab studies(?)

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