EDMEDM LANL Review of EDM Cost and Schedule Jan Boissevain, P-25 February 11, 2005, Los Alamos National Laboratory EDM Reference Design Tour of the Reference Design Engineering Constraints Reference Design Details Outstanding Issues EDMEDM EDM Experiment Vertical Section View Dilution Refrigerator (DR: 1 of 2) Upper Cryostat Services Port DR LHe Volume 450 Liters 3 He Polarized Source He Purifier Assembly 3 He Injection Volume Central LHe Volume (300mK, ~1000 Liters) Re-entrant Insert for Neutron Guide Lower Cryostat Upper Cryostat 3He Injection Volume cos Magnet 5.6m 4 Layer metal Shield EDMEDM EDM Experiment Horiz. Section View 3He Injection cos Magnet 6.4 m 2.5 m Central Helium Volume 4 Layer Metal Shielding EDMEDM EDM Experiment Horiz. Section View 2 Light Guide Measurement Cell Ground Electrode Electric Field Return HV Generator HV Electrode Support EDMEDM Engineering Constraints Lower Cryostat 300mK Helium Volume Measurement Cell in 10mG (10 -3 Uniformity) No Superconductors inside lead shield (no Al 25cm from HV Electrode Neutron Activation: Minimize Hi Z Materials UCN Friendly Materials No Sparks SQUIDS Electrode thin coatings Dressed Spin Magnets 2 magnets to minimize eddy currents in ferromagnetic shield Electrode Coating Important EDMEDM Engineering Constraints 2 Upper Cryostat He II film burner geometry He Purification Technology Choice Polarized 3 He friendly Injection Volume & Piping Magnetic transition from 3He Polarized Source to Injection Volume Magnetic transition from Injection Volume magnet to B0 magnet EDMEDM Ferromagnetic Shield Nesting Inner Dressing Coil Outer Dressing Coil 50K Shield 4K Shield Superconducting Lead Shield Ferromagnetic Shield B0 cos Magnet EDMEDM Ferromagnetic Shield Nesting 2 Inner Dressing Coil Outer Dressing Coil B0 cos Magnet Ferromagnetic Shield Superconducting Lead Shield Beam EDMEDM HV Generator Actuation HV Electrode Support HV Probe HV Return He Safety Vent Port EDMEDM Helium Purifier Thermal Standoff Activated Charcoal Pump (4K) Helium Purification Volume (0.4K) Pure Helium Staging Volume (0.4K) 3 He Injection Volume (0.4K) Tied to 50K Shield Tied to 4K Shield Super-fluid Film Burner EDMEDM Central LHe Volume Mount Vacuum Can 50K Shield 4K Shield Central LHe Volume 4 Layer Metal Shield Mount (1 of 4) EDMEDM Central He Volume Mount 2 Vacuum Can 50K Shield Mount Point 4K Shield Mount Point Central Volume Mount Point 50K Shield 4K Shield EDMEDM Upper/Lower Cryostat Interface Inner cos Dressing Coil Central Helium Volume 3 He Injection Region cos Coil DR 1 DR 2 Turbo Pump He Recirculation Bellows Actuators HV Generator Actuators 3He Injection Region He Safety Vent Helium Purifier Actuator Support EDMEDM Upper/Lower Cryostat Interface 2 Helium Recirculation Bellows Measuring Cell Light Guide EDMEDM EDM/Beam-line Interface Collimator Be Foil 4K Shield Be Foil 50K Shield Be/Teflon Multi- Foil Window at LHe/Vacuum Interface Measurement Cell EDMEDM Upper Cryostat Installation Upper Cryostat Vacuum Can Removed, Heat Shield Side Panels Removed EDMEDM EDM Experiment at SNS DR Pump Systems Fundamental Neutron Physics External Building 1000 Liter Dewar 3He Polarized Source Pump/Gas System Helium Liquefier Helium Liquefier Compressor EDMEDM EDM Experiment at SNS 2 First Chopper Double Crystal Monochromator Bismuth Filter EDMEDM Outstanding Engineering Issues Prototype Upper Cryostat R&D Project He II Film Burners Reason for the 2 nd Dilution Refrigerator Important Geometry Issue 3 He Injection He Purifier Technology Choice Cos Magnets Cal-Tech R&D Project Check sensitivity to ferromagnetic materials Check performance of ferromagnetic/superconducting lead shield Compare to Ansys calculations Transition Magnets Valves