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Soudan Installation: Fermilab

Soudan Installation: Fermilab. Constructing RF Clean Room HVAC & Radon Filtering Detector Preparation Room Electronics Hut Equipment Room. Soudan Mine. First Iron Mine in Minnesota In production until 1962 => State Park & Site for Experimental Physics Existing Cavern 73x14x14 m 3

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Soudan Installation: Fermilab

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  1. Soudan Installation: Fermilab • Constructing • RF Clean Room • HVAC & Radon Filtering • Detector Preparation Room • Electronics Hut • Equipment Room CDMS II Overview - Gaitskell - CfPA EAB Review

  2. Soudan Mine • First Iron Mine in Minnesota • In production until 1962 => State Park & Site for Experimental Physics • Existing Cavern • 73x14x14 m3 • Depth 713 m (2000 mwe) CDMS II Overview - Gaitskell - CfPA EAB Review

  3. Soudan Cavern New MINOS Cavern (not constructed yet) CDMS Huts, Fridge & Clean Rooms (Foundations going in) Existing Soudan I Experiment CDMS II Overview - Gaitskell - CfPA EAB Review

  4. Soudan Gamma Background 104 2.8 MeV Gammas/m2/s 1 • Gamma Background • ~half that at SUF • 20 cm Pb will achieve 0.03/keV/kg/day @10keV • Rock Composition • Ely greenstone • 50% SiO2 • 15% Al2O3 • ~20% CaO,FeO,MgO • 5” Shotcrete on walls has ~2x activity CDMS II Overview - Gaitskell - CfPA EAB Review

  5. Soudan Neutron Background /1 • Low Energy (20 keV-5 MeV) • Natural Radioactivity Dominant Source • (a,n) a from U,Th on light nuclei =>2x10-8 n/g/s • Fision => 2.7x10-9 n/g/s CDMS II Overview - Gaitskell - CfPA EAB Review

  6. Soudan Neutron Background /2 • High Energy (50 MeV-2 GeV) • Muons • In spite of low fluxes, “punch” through shield • Significant in range 150 MeV->650 MeV Relative contribution of neutrons to detector hits MC of Neutron Spectrum from 5 m shell of rock due to hard muon spectrum CDMS II Overview - Gaitskell - CfPA EAB Review

  7. Soudan Neutron Background /3 Simple Shield 22 cm Pb inside 50 cm poly • Shield Design • Neutron Management 10 poly; 8 Pb; 10 poly; 15 Pb; 30 poly (cm) CDMSII Target DM 0.0003 events/keV/kg/day CDMSII Target DM 0.0003 events/keV/kg/day Composite Shield Illustrated CDMS II Overview - Gaitskell - CfPA EAB Review

  8. Shield & Active Veto • Cylindrical Geometry • Plastic Scintillator Veto >99.8% Efficiency • 12t Pb will generate neutrons which interact at 0.05 /keV/kg/day @ 10 keV Active Veto Poly & Pb ICEBOX FRIDGE CDMS II Overview - Gaitskell - CfPA EAB Review

  9. Cryogenic Systems: Fermilab • Purchased Dilution Refrigerator • Fabricate CDMS II Icebox • Design & Purchase Control Systems for Cryogenics • Learning lessons from SUF operations CDMS II Overview - Gaitskell - CfPA EAB Review

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