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Soudan Installation: Fermilab PowerPoint PPT Presentation


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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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Soudan installation fermilab

Soudan Installation: Fermilab

  • Constructing

    • RF Clean Room

      • HVAC & Radon Filtering

    • Detector Preparation Room

    • Electronics Hut

    • Equipment Room

CDMS II Overview - Gaitskell - CfPA EAB Review


Soudan mine

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


Soudan cavern

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


Soudan gamma background

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


Soudan neutron background 1

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


Soudan neutron background 2

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


Soudan neutron background 3

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


Shield active veto

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


Cryogenic systems fermilab

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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