SCU Segmented Cryostat Concept M Leitner S Prestemon
- Slides: 35
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 Removable Low-Loss Bayonets Relief Circuits Mass-Produced Cryostats Cryogenic Distribution Hard X-Ray Line Soft X-Ray Line M. Leitner - SCU Meeting - September 2, 2014 2
from July 8 th 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
from July 8 th 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
from July 8 th 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
from July 8 th 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 Nb 3 Sn undulator are 4 cm long for each core Alignment Verification Quadrupoles / Bx correction Second Field Integral with phase shifter -2 k Lb +k +k End corrector Phase shifter dipole End corrector Lb
Example Segmented SCU Layout Undulator Packing Factor Including Diagnostics Sections = 85% M. Leitner - SCU Meeting - September 2, 2014 7
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 8
Components Of A Single Undulator Line Relief Circuits Cryogenic Valves and Removable Low-Loss Bayonets Cryogenic Distribution Mass-Produced Cryostats Bellows For Undulator Remova (Between Cryostats Vacuum Valves Vacuum Pumps Vacuum Gauges Current Leads Existing SLAC Support Posts (For Size Comparison) M. Leitner - SCU Meeting - September 2, 2014 9
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 Syste For Operation And Cool Down Cryostat Vacuum Vessel Vacuum Valve Vacuum Pump Vacuum Gauges Bellows Cryogenic Distribution (High Pressure LHe And GHe Minimize Pipe Diameters) Current Leads Undulator Alignment Based On Pulsed Wire Fiducialization Cryogenic Control Valves Are Located In Cryostat To Ease Operation Phase Shifter, Focusing Quad, And BPM Are Inside The Cryostat M. Leitner - SCU Meeting - September 2, 2014 10
Single Undulator Segment Components Aluminum Thermal Shield Is Actively Cooled On Bottom And Conduction Cooled On The Sides M. Leitner - SCU Meeting - September 2, 2014 11 (Potential Location For Magnetic Shields)
Single Undulator Segment Components ~50 K SHIELD AND BEAMIPE 4. 5 K COLDMASS LHe Header RT Strongback Cryogenic Support Posts M. Leitner - SCU Meeting - September 2, 2014 Undulator Coil Structure 12 Bottom Thermal Shield Plate
Single Undulator Segment Components Bottom-Up Design Is Optimized For Mass-Production - Fiberglass Posts Allow Consistent Alignment Moveable Posts Cryogenic Support Posts Fixed Post Room Temperature Strongback 4. 5 K Linear Precision Bearings 300 K Actual Fiberglass Support Post M. Leitner - SCU Meeting - September 2, 2014 Moveable Posts 13 ~50 K
Single Undulator Segment Components Pre-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 14
Thermal Transitions, Focusing Quadrupole And Cold BPM Valv e Vacuum Chamber 50 K Intercept M. Leitner - SCU Meeting - September 2, 2014 Thermal Transition (Bellows) Focusing Quad Vacuum Chamber Alignment System 15 Cold BPM 50 K Intercept Valve, Pumping, Gauges, Beamline Bellows Thermal Transition (Bellows)
SCU Assembly Steps Prepare Room Temperature Strongback M. Leitner - SCU Meeting - September 2, 2014 16
SCU Assembly Steps Place Linear Bearings And Pre-Assembled Fiberglass Posts M. Leitner - SCU Meeting - September 2, 2014 17
SCU Assembly Steps Place Bottom MLI Blankets (Not Shown) And Thermal Shield Bottom Plate With Pre-Welded Cooling Lines M. Leitner - SCU Meeting - September 2, 2014 18
SCU Assembly Steps Place First, Pre-Fiducialized Undulator Coil Section M. Leitner - SCU Meeting - September 2, 2014 19
SCU Assembly Steps Place Second, Pre-Fiducialized Undulator Coil Section Rigid Connection Small Quad Dipole M. Leitner - SCU Meeting - September 2, 2014 Phase Shifter 20 Dipole Large Quad
SCU Assembly Steps Connect And Align Vacuum Chamber, Connect Thermal Transitions Vacuum Chamber Alignment Mounts Thermal Transition And BPM Thermal Transition M. Leitner - SCU Meeting - September 2, 2014 21
SCU Assembly Steps Weld Pre-Fabricated LHe Header, Wrap With Multi-Layer Insulation M. Leitner - SCU Meeting - September 2, 2014 22
SCU Assembly Steps Assemble Thermal Shield And Wrap With Multi-Layer Insulation M. Leitner - SCU Meeting - September 2, 2014 23
SCU Assembly Steps Drop Coldmass Into Vacuum Vessel, Connect Beamline Vacuum Bolted Flange Connection M. Leitner - SCU Meeting - September 2, 2014 24
SCU Assembly Steps Connect Pre-Routed Current Lead Assemblies Current Feedthroughs M. Leitner - SCU Meeting - September 2, 2014 25
SCU Assembly Steps Weld Final Cryogenic Connections To Bayonet Box (Part Of Vacuum Chamber) M. Leitner - SCU Meeting - September 2, 2014 26
SCU Assembly Steps Close Cryostat Vacuum Vessel M. Leitner - SCU Meeting - September 2, 2014 27
SCU Assembly Steps Connect Cryogenic Relief Circuits Relief Valves Different Circuits For Cooldown and Regular Operation M. Leitner - SCU Meeting - September 2, 2014 28
SCU Assembly Steps Connect Beamline Valves, Vacuum Pumps And Gauges Interstitial Vacuum Equipment M. Leitner - SCU Meeting - September 2, 2014 29
SCU Assembly Steps Prepare For Checkout And Lifting M. Leitner - SCU Meeting - September 2, 2014 30
SCU Assembly Steps Assemble To Support System M. Leitner - SCU Meeting - September 2, 2014 31
SCU Assembly Steps Installation And Alignment In Tunnel M. Leitner - SCU Meeting - September 2, 2014 32
SCU Assembly Steps Connection To Cryogenic Distribution Line Low-Loss Bayonets Cryogenic Relief Connections Control Valves (Hidden, On Cryostat Side) Cryogenics Expansion Joint Box Shut-Off Valves M. Leitner - SCU Meeting - September 2, 2014 33
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 34
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 35
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