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EDM Engineering Issues

EDM Engineering Issues. General Mechanical Considerations EDM Cryostat Plan D ANSYS EMAG Calculations ANSYS MECH Calculations. 3 June ‘03 J. Boissevain. General Mechanical Issues. Vibration Large roots blower system for Dilution Refrigerator Cold Heads Choice of Cold Heads or Liquefier

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EDM Engineering Issues

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  1. EDM Engineering Issues General Mechanical Considerations EDM Cryostat Plan D ANSYS EMAG Calculations ANSYS MECH Calculations 3 June ‘03 J. Boissevain

  2. General Mechanical Issues • Vibration • Large roots blower system for Dilution Refrigerator • Cold Heads • Choice of Cold Heads or Liquefier • Choice of Helium Purification Method • Define Requirements for Polarized 3He Injection • Assembly Issues with Cesium Coating • Collimator Design • Neutron Guide/Splitter Design • Magnetic Shielding in ER2 • Maintenance of Apparatus • Real Estate in ER2

  3. EDM Cryostat Plan D • 0.8m (30”) diameter x 2m long fiberglass enclosure tube with metal flanges • Thin copper foil HV ground-plane glued to enclosure tube inner surface • Inside: target cell/electrode assembly, light guides • Cos θ magnet outside enclosure • RF coils • Ferromagnetic Shield – location determined by Cos θ magnet uniformity requirements

  4. EDM Cryostat Plan D (2) • Superconducting shield – lead layer supported by aluminum can – 4°K • Heat shield - 50°K • μMetal shield - 300°K • Vacuum Can ? • Cryogenic polarized 3He bend to target preparation vessel • Helium purifier ???

  5. EDM Cryostat Plan D (3) • Horizontal location for variable capacitor • Trade-off between shielding and apparatus heigt

  6. ANSYS EMAG Calculations • Magnet Design • Uniform field over a large volume • Proximity of Ferromagnetic and super-conducting shields • Large SS flanges and enclosure • HV Electrode Design • Target cell material properties • Thin metal (Cu?) coated acrylic? • RF Coil Design • Sensitivity to field variations over large volume • Shielding Design • Large complicated shape with multiple large penetrations

  7. ANSYS MECH Calculations • Cryogenic Safety Issues • Calculate wire seal flanges and conflat flanges for pressure application • Size safety vents • Window Design • Mechanical Support of Target Enclosure/HV Variable Capacitor (>1000Kg)

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