1. 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

2. 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 cosθ Magnet 5.6m 4 Layer μmetal Shield

3. EDMEDM EDM Experiment Horiz. Section View 3He Injection cosθ Magnet 6.4 m 2.5 m Central Helium Volume 4 Layer μMetal Shielding

4. EDMEDM EDM Experiment Horiz. Section View 2 Light Guide Measurement Cell Ground Electrode Electric Field Return HV Generator HV Electrode Support

5. EDMEDM Engineering Constraints Lower Cryostat – 300mK Helium Volume –Measurement Cell in 10mG (10 -3 Uniformity) No Superconductors inside lead shield (no Al <1K) No ferromagnetic materials (SS?) –High Electric Field: >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

6. 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

7. EDMEDM Ferromagnetic Shield Nesting Inner Dressing Coil Outer Dressing Coil 50K Shield 4K Shield Superconducting Lead Shield Ferromagnetic Shield B0 cosθ Magnet

8. EDMEDM Ferromagnetic Shield Nesting 2 Inner Dressing Coil Outer Dressing Coil B0 cosθ Magnet Ferromagnetic Shield Superconducting Lead Shield Beam

9. EDMEDM HV Generator Actuation HV Electrode Support HV Probe HV Return He Safety Vent Port

10. 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

11. EDMEDM Central LHe Volume Mount Vacuum Can 50K Shield 4K Shield Central LHe Volume 4 Layer μMetal Shield Mount (1 of 4)

12. EDMEDM Central He Volume Mount 2 Vacuum Can 50K Shield Mount Point 4K Shield Mount Point Central Volume Mount Point 50K Shield 4K Shield

13. EDMEDM Upper/Lower Cryostat Interface Inner cosθ Dressing Coil Central Helium Volume 3 He Injection Region cosθ Coil DR 1 DR 2 Turbo Pump He Recirculation Bellows Actuators HV Generator Actuators 3He Injection Region He Safety Vent Helium Purifier Actuator Support

14. EDMEDM Upper/Lower Cryostat Interface 2 Helium Recirculation Bellows Measuring Cell Light Guide

15. 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

16. EDMEDM Upper Cryostat Installation Upper Cryostat Vacuum Can Removed, Heat Shield Side Panels Removed

17. 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

18. EDMEDM EDM Experiment at SNS 2 First Chopper Double Crystal Monochromator Bismuth Filter

19. 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 Cosθ 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