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SCU Segmented Cryostat Concept M. Leitner, S. Prestemon , D. Arbelaez , S. Myers

SCU Segmented Cryostat Concept M. Leitner, S. Prestemon , D. Arbelaez , S. Myers. September 2 nd , 2014. Segmented SCU Layout Allows Servicing Individual Undulator Segments While Keeping Whole String Cold One Cryostat Contains 2 Nominal Two-Meter Undulator Segments. Cryogenic Valves and

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SCU Segmented Cryostat Concept M. Leitner, S. Prestemon , D. Arbelaez , S. Myers

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  1. SCU Segmented Cryostat ConceptM. Leitner, S. Prestemon, D. Arbelaez, S. Myers September 2nd, 2014

  2. Segmented SCU Layout Allows Servicing Individual Undulator Segments While Keeping Whole String ColdOne Cryostat Contains 2 Nominal Two-Meter Undulator Segments Cryogenic Valves and Removable Low-Loss Bayonets Relief Circuits Mass-Produced Cryostats Cryogenic Distribution Soft X-Ray Line Hard X-Ray Line M. Leitner - SCU Meeting - September 2, 2014

  3. from July 8th SCU meeting [D. Arbelaez, et.al.] Quadrupole Concept • Conceptual design of a compact quadropole • Directly attached to the undulator cold mass • Integrated quadrupole strength of 4 T (LCLS-II quad strength) can be obtained • Independently powered coils can be used for x-field correction Quadrupole Magnet End corrector

  4. from July 8th SCU meeting [D. Arbelaez, et.al.] External Fiducialization • Pulsed wire can be placed in the center of the undulator or quadrupoles • Wire detectors can be fiducialized and used to find the two ends of the wire • Wire position can be related to external fiducials on the cryostat based on the cold magnetic measurements Pulsed Wire Fiducialization Fiducialized Detector can be used to find wire location Wire inside vacuum chamber A second detector will be added to find both ends of the wire

  5. from July 8th SCU meeting [D. Arbelaez, et.al.] Vertical Alignment with Alignment Quadrupoles • Use reference quadrupoles at each end of the 3 m structure • Tuning and calibration is based on the line between the magnetic center of the two quadrupoles • Fiducialization can be performed with a wire measurement and referenced to fiducials on the outside of the cryostat • Allows for beam based alignment by moving the cryostat to find the center of the quads with the electron beam Full Length Quadrupole Small Alignment Quadrupole

  6. from July 8th SCU meeting [D. Arbelaez, et.al.] Conceptual Phase Shifter Layout • Compact phase shifter uses one end corrector from each undulator and one extra dipole magnet in between • Distance between the undulator cores ~ 13 cm for this layout (could be reduced if alignment quadrupoles are not necessary) • Joint sections for Nb3Sn undulator are 4 cm long for each core Alignment Verification Quadrupoles / Bx correction Second Field Integral with phase shifter -2k Lb +k +k Lb Phase shifter dipole End corrector End corrector

  7. Example Segmented SCU LayoutUndulator Packing Factor Including Diagnostics Sections = 85% M. Leitner - SCU Meeting - September 2, 2014

  8. Two Superconducting Undulator Lines Would Fit Into Existing SLAC Tunnel Soft X-Ray Line Hard X-Ray Line M. Leitner - SCU Meeting - September 2, 2014

  9. Components Of A Single Undulator Line Relief Circuits Cryogenic Valves and Removable Low-Loss Bayonets Cryogenic Distribution Mass-Produced Cryostats Bellows For Undulator Removal (Between Cryostats) Vacuum Valves Vacuum Pumps Vacuum Gauges Current Leads Existing SLAC Support Posts (For Size Comparison) M. Leitner - SCU Meeting - September 2, 2014

  10. Single Undulator Segment Components Cryogenic Valves And Removable Bayonets Allow Removal Of Undulator Segments While Keeping Undulator Line Cold Relief Circuits Are Piped Into A Distribution Return System For Operation And Cool Down Cryostat Vacuum Vessel Vacuum Valve Vacuum Valve Vacuum Pump Vacuum Gauges Bellows Cryogenic Distribution (High Pressure LHe And GHe Minimize Pipe Diameters) Current Leads Cryogenic Control Valves Are Located In Cryostat To Ease Operation Undulator Alignment Based OnPulsed Wire Fiducialization Phase Shifter, Focusing Quad, And BPM Are Inside The Cryostat M. Leitner - SCU Meeting - September 2, 2014

  11. Single Undulator Segment Components Aluminum Thermal ShieldIs Actively Cooled On Bottom And Conduction Cooled On The Sides (Potential Location For Magnetic Shields) M. Leitner - SCU Meeting - September 2, 2014

  12. Single Undulator Segment Components ~50 K SHIELD AND BEAMIPE 4.5 K COLDMASS LHe Header RT Strongback Cryogenic Support Posts Undulator Coil Structure Bottom Thermal Shield Plate M. Leitner - SCU Meeting - September 2, 2014

  13. Single Undulator Segment ComponentsBottom-Up Design Is Optimized For Mass-Production - Fiberglass Posts Allow Consistent Alignment Moveable Posts Fixed Post Fixed Post Moveable Posts 4.5 K Room TemperatureStrongback Cryogenic Support Posts ~50 K 300 K Linear Precision Bearings Actual Fiberglass Support Post M. Leitner - SCU Meeting - September 2, 2014

  14. Single Undulator Segment ComponentsPre-Assembled Coldmass Drops Into Vacuum Vessel – Ease Of Assembly, No Major Tooling Required Weld Final Cryogenic Connections Connect Beamline Vacuum M. Leitner - SCU Meeting - September 2, 2014

  15. Thermal Transitions, Focusing Quadrupole And Cold BPM Valve, Pumping, Gauges, Beamline Bellows Vacuum Chamber Focusing Quad Cold BPM Valve 50 K Intercept Thermal Transition (Bellows) Vacuum Chamber Alignment System 50 K Intercept Thermal Transition (Bellows) M. Leitner - SCU Meeting - September 2, 2014

  16. SCU Assembly StepsPrepare Room Temperature Strongback M. Leitner - SCU Meeting - September 2, 2014

  17. SCU Assembly StepsPlace Linear Bearings And Pre-Assembled Fiberglass Posts M. Leitner - SCU Meeting - September 2, 2014

  18. SCU Assembly StepsPlace Bottom MLI Blankets (Not Shown) And Thermal Shield Bottom Plate With Pre-Welded Cooling Lines M. Leitner - SCU Meeting - September 2, 2014

  19. SCU Assembly StepsPlace First, Pre-Fiducialized Undulator Coil Section M. Leitner - SCU Meeting - September 2, 2014

  20. SCU Assembly StepsPlace Second, Pre-Fiducialized Undulator Coil Section Rigid Connection Dipole Large Quad Phase Shifter Small Quad Dipole M. Leitner - SCU Meeting - September 2, 2014

  21. SCU Assembly StepsConnect And Align Vacuum Chamber, Connect Thermal Transitions Vacuum Chamber Alignment Mounts Vacuum Chamber Alignment Mounts Thermal Transition And BPM Thermal Transition M. Leitner - SCU Meeting - September 2, 2014

  22. SCU Assembly StepsWeld Pre-Fabricated LHe Header, Wrap With Multi-Layer Insulation M. Leitner - SCU Meeting - September 2, 2014

  23. SCU Assembly StepsAssemble Thermal Shield And Wrap With Multi-Layer Insulation M. Leitner - SCU Meeting - September 2, 2014

  24. SCU Assembly StepsDrop Coldmass Into Vacuum Vessel, Connect Beamline Vacuum Beamline Vacuum Bolted Flange Connection Beamline Vacuum Bolted Flange Connection M. Leitner - SCU Meeting - September 2, 2014

  25. SCU Assembly StepsConnect Pre-Routed Current Lead Assemblies Current Feedthroughs M. Leitner - SCU Meeting - September 2, 2014

  26. SCU Assembly StepsWeld Final Cryogenic Connections To Bayonet Box Bayonet Box (Part Of Vacuum Chamber) M. Leitner - SCU Meeting - September 2, 2014

  27. SCU Assembly StepsClose Cryostat Vacuum Vessel M. Leitner - SCU Meeting - September 2, 2014

  28. SCU Assembly StepsConnect Cryogenic Relief Circuits Relief Valves Different Circuits For Cooldown and Regular Operation M. Leitner - SCU Meeting - September 2, 2014

  29. SCU Assembly StepsConnect Beamline Valves, Vacuum Pumps And Gauges Interstitial Vacuum Equipment Interstitial Vacuum Equipment M. Leitner - SCU Meeting - September 2, 2014

  30. SCU Assembly StepsPrepare For Checkout And Lifting M. Leitner - SCU Meeting - September 2, 2014

  31. SCU Assembly StepsAssemble To Support System M. Leitner - SCU Meeting - September 2, 2014

  32. SCU Assembly StepsInstallation And Alignment In Tunnel M. Leitner - SCU Meeting - September 2, 2014

  33. SCU Assembly StepsConnection To Cryogenic Distribution Line Cryogenic Relief Connections Low-Loss Bayonets Control Valves (Hidden, On Cryostat Side) Cryogenics Expansion Joint Box Shut-Off Valves M. Leitner - SCU Meeting - September 2, 2014

  34. Summary • Segmented cryostat design takes full advantage of LBNL alignment strategy utilizing end quadrupoles • Cryostat with low-loss fiberglass posts employing bottom-up assembly is optimized for mass-production and superior alignment • A segmented, superconducting undulator design allows servicing of individual undulator segments while keeping rest of undulator strings cold • Minimized thermal cycling assures consistent undulator alignment • High-quality bayonets and cryogenic valves assure low-loss cryogenic operation M. Leitner - SCU Meeting - September 2, 2014

  35. Next Steps • Develop cryostat heat load budget • Develop cryogenic flow diagram • Based on flow diagram optimize cryogenic distribution system M. Leitner - SCU Meeting - September 2, 2014

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