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PEEM III Endstation Design Review

PEEM III Endstation Design Review. Endstation Layout Support System Vessel Magnetic Shielding. PEEM III Endstation Design Review. Endstation Layout – Sector 11. PEEM III Endstation Design Review. Endstation Layout. PEEM III Endstation Design Review. Sample Prep and transfer

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PEEM III Endstation Design Review

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  1. PEEM III Endstation Design Review • Endstation Layout • Support System • Vessel • Magnetic Shielding

  2. PEEM III Endstation Design Review Endstation Layout – Sector 11

  3. PEEM III Endstation Design Review Endstation Layout

  4. PEEM III Endstation Design Review Sample Prep and transfer General HV – UHV in Sample and Mirror Sections < 2x10-7 Gauss AC Field Nanometer Scale Stability-Sample to Optics “Easy” access to internal components Microscope

  5. PEEM III Endstation Design Review Microscope - Details Fiber-Optic Laser Separator Replacement Optics Internal Support 5-Axis Sample Manipulator UHV Sub-Chamber 90 degree Optics and Mirror CCD Cameras

  6. PEEM III Endstation Design Review Support System • High stiffness - vibration isolated internal support • Semi-kinematic mounting • Epoxy-granite filled base • Visco-elastic damping • Isolated chamber and external components

  7. PEEM III Endstation Design Review • Install/Align base stand with visco-elastic damping pads • Install/align filled base • Side mounting pads for jacks/ball plates • Mount internal table support legs and align fiducialized table (or plate) • Install/align struts and chamber Support System - Assembly

  8. PEEM III Endstation Design Review Vacuum Vessel

  9. PEEM III Endstation Design Review Vacuum Vessel - Details HV required – UHV desirable SS plate weldment Differentially pumped, double o-ring, window frame to lid seal “Standard” conflat ports

  10. PEEM III Endstation Design Review UHV Sub-Chamber - Details • Aluminum conductance limited UHV-HV sub-chambers • O-Ring base/lid seal • Glass viewing window • Be-Cu sheet interface

  11. PEEM III Endstation Design Review UHV Sub-Chamber - Details

  12. Table 5. Gas loading on the Main Peem3 chamber and pressure after 100 hours with 10" OD tee pumping system, 800 l/s ion pump + 1000 l/s turbo

  13. Schematic arrangement of Peem3 pumping for UHV sub-section and main tank Main Pumping Tee Cu/Be rolled sheet Hole for electrons Main Pumping Adaptor Mu metal Stove Pipe UHV Pump Tee Turbo UHV sub- chamber Window Valve UHV Pump bellows Main Pumping Bellows Ion Pump 2 Main microscope tank Ion Pump 1

  14. Table 7. Gas loading on the UHV sub-chamber and pressure after 100 hours with 8" OD tee pumping system and 800 l/s ion pump. Pressure in main tank = 8.5e-8 torr.

  15. PEEM III Endstation Design Review Magnetic Shielding

  16. Magnetic Shielding requirements • require < 2x10-7 GaussAC • AC field on the floor of +-0.3mGauss (1Hz) • Need attenuation of ~ 2500 • Crude cylinder model indicate • 2 layers attenuate ~1600 • 3 layers attenuate ~ 26000 • Better calculation by Amuneal suggest • 3 layer attenuation ~ 7000 • Thickness of shield = 3mm for mechanical rigidity • Shield spacing = 25mm – as large as possible • given space constrains • Degaussing of inner shield with AC and internal coils Magnetic field at Peem3 location Model of mu metal shields with Vacuum chamber removed

  17. PEEM III Endstation Design Review Magnetic Shielding 3 Concentric boxes with ~ 1’’ gap Assembled from outside – in Separated with aluminum spacers/handle mounts PEM fasteners @ ~3.5” spacing No penetrations > 5 diameters in critical areas - tubulations ~ 3 diameters in 2 pump sections

  18. PEEM III Endstation Design Review Tubulation Details Magnetic Shielding

  19. PEEM III Endstation Design Review The End(Hopefully)

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