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Soudan Installation: Fermilab

Published byἈνδρομάχη Ζαφειρόπουλος Modified over 6 years ago

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Presentation on theme: "Soudan Installation: Fermilab"— Presentation transcript:

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 CDMS II Overview - Gaitskell - CfPA EAB Review
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 CDMS II Overview - Gaitskell - CfPA EAB Review
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
~half that at SUF 20 cm Pb will achieve Rock Composition Ely greenstone 50% SiO2 15% Al2O3 ~20% CaO,FeO,MgO 5” Shotcrete on walls has ~2x activity Gammas/m2/s 2.8 MeV 1 104 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
Shield Design Neutron Management Simple Shield 22 cm Pb inside 50 cm poly 10 poly; 8 Pb; 10 poly; 15 Pb; 30 poly (cm) CDMSII Target DM events/keV/kg/day CDMSII Target DM events/keV/kg/day Composite Shield Illustrated CDMS II Overview - Gaitskell - CfPA EAB Review

8 CDMS II Overview - Gaitskell - CfPA EAB Review
Shield & Active Veto Cylindrical Geometry Plastic Scintillator Veto >99.8% Efficiency 12t Pb will generate neutrons which interact at 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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