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EDM Engineering Issues

This document outlines the essential mechanical considerations for the design of an EDM cryostat. It covers various aspects, including vibration management for a large roots blower system, evaluating the selection of cold heads versus liquefiers, and methods for helium purification. The plan discusses polarization requirements for 3He injection, assembly challenges related to cesium coating, collimator and neutron guide design, and magnetic shielding. Furthermore, it details the considerations for mechanical support and safety concerning high-voltage components and cryogenic environments.

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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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