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Status & WBS of Cosmic Ray Shield

Status & WBS of Cosmic Ray Shield. DETECTOR REQUIREMENT : Record Potential CR Bkg Hits for All Trigger Evts. Cosmic ray induced 100 – 110 MeV e - events in detector region, (delta rays or mu decay e - ), require active and passive shielding to suppress.

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Status & WBS of Cosmic Ray Shield

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  1. Status & WBS of CosmicRay Shield DETECTOR REQUIREMENT :Record Potential CR Bkg Hits for All Trigger Evts • Cosmic ray induced 100 – 110 MeVe- events in detector region, (delta rays or mu decay e-), require active and passive shielding to suppress. • CR Sim Study has shown that 10- 4 Inefficiency in a scintillator shield design <-> 0.004 bkg evts / 107s. run. • Achieving Max Hermeticityin Detector Deployment • Achieving Max Detector Efficiency For Cosmic Rays with 2-Fold ORs in a 3 Scintillator Layer Design • Achieving Max Reduction of Mu Capture Neutrons in CRS • Developing CR Simulation Studies for Latest CRS & DS Tracker and Calorimeter J Kane - W & M MECO Collaboration Mtg - UCIrvine Feb. 06/07, 2005

  2. Conservative Footprint of CRS Detector TOP VIEW - Shows Scintillator Modules & Concrete Blocks High CR Shield Hermeticity

  3. End View of Active & Passive CR Shield Hermeticity of Shield Planes - L, R, T, B,& E

  4. Half Modules between Floor Beams - 96% Coverage Shield-B 96% eff

  5. Full Module Design - 10cm Overlap by Neighbors

  6. A Close-up View of Hermeticity Overlap of Full Modules (2.2 x 4.5m) Al Plate Scintillator Layer-1 (22 bars / 3 WSF ea) Bottom Modules (1 x 4.4m) - beneath Return Yoke

  7. CR Detector Efficiency • Cosmic Ray Response vs. No. of WSF in 0.5m MINOS Scintillator Within the next 3 months 100 extruded full length scintillator bars should be available for attenuation studies & testing of module assembly methods.

  8. Optical Fibers-to-16 Pixels of H8711 PMT Assembly

  9. Investigation of 64 Pixel PMTs

  10. BURLE PLANACON MCP - PMT

  11. H8500 MultiAnode PMT Assembly - 64 Pixels Discussion with Stan Majewski (head of Jlab Detector Group) Burle Planatron vs Hama H8500 : He questioned using the first - low in gain & too untested His group has much experience with the H8500. Hama has given Jlab 60 for testing in medical scanner apps. The group has developed a fast preamp that mates directly to back of base . Price per channel? / Stan expressed real interest in helping us in any way. Having Hama’s ear, he plans to push them to offer a “green-enhanced” cathode for WLS fiber users in HEP.

  12. Further Properties

  13. First Visit to ITASCA on Feb 16, 2005 Attending : ITASCA Staff / Anna Pla-Dalmau / J Kane / Uwe Greif Anna Pla : MINOS Manager of Production / Director of FNAL Scintillator Development Lab Uwe Greif : Colorado School of Mines / nu-e Expt @ Spallation Source requiring CR Shield Agenda : Review Tolerances asked for in Drawing / Tour Factory Floor / Press the Flesh Visit to Development Lab : Offer from Anna

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