Cosmic ray induced 100

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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.
• CR Sim Study has shown that 10- 4 Inefficiency
  in a scintillator shield design lt-gt 0.004 bkg
  evts / 107s. run.

• Achieving Max Hermeticity in 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
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Conservative Footprint of CRS Detector
TOP VIEW - Shows Scintillator Modules Concrete
Blocks
High CR Shield Hermeticity
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End View of Active Passive CR Shield
Hermeticity of Shield Planes - L, R, T, B, E
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Half Modules between Floor Beams - 96 Coverage
Shield-B 96 eff
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Full Module Design - 10cm Overlap by Neighbors
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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
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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.

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Optical Fibers-to-16 Pixels of H8711 PMT Assembly
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Investigation of 64 Pixel PMTs
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BURLE PLANACON MCP - PMT
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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 Hamas ear, he plans to push them
to offer a green-enhanced cathode for WLS
fiber users in HEP.
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Further Properties
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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 _at_ 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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