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SNS PPU Cryomodule Space Frame

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Presentation on theme: "SNS PPU Cryomodule Space Frame"— Presentation transcript:

1 SNS PPU Cryomodule Space Frame
SNS PPU CRYOMODULE PDR SNS PPU CRYOMODULE PDR SNS PPU Cryomodule Space Frame Matt Marchlik Matt Marchlik Wednesday, February 27 2019 Wednesday, February 27 2019

2 Fabrication/Procurement methodology Remaining Tasks Summary
Outline Requirements Design Assembly Component/function Fabrication/Procurement methodology Remaining Tasks Summary

3 Support the cold mass assembly Aligns the cold mass
Requirements Support the cold mass assembly Aligns the cold mass Support the thermal shield Support the end thermal shield assemblies Support the outer magnetic shield Handle the shipping design loads (4 vertical, 5 longitudinal, 1.5 transverse) The shipping design loads and geometry mass has not significantly changed from the original design. The design is assumed to be adequate based on past performance

4 Design – Assembly Overview
Weldment Axial Nitronic Rods x8 Transverse Nitronic Rods x32 Support Ring Connectors x8 Wheels x4

5 Design – Weldment Thin support rings x6 Thick support rings x2
Support tube 2.5” OD x .25” wall Made from 304 SS

6 Design – Support Ring Connectors
Support ring connectors are removed to clear FPCs during the cold mass to spaceframe transfer. Reinstalled after transfer.

7 Design – Wheels 2 wheels per thick support ring connector
Wheels oriented in front of support ring connector in direction of insertion. Supply end first into vac vessel Wheels support the spaceframe in the vac vessel as the assembly is transferred from the assembly rails. Wheels lose contact after the spaceframe is lifted by the tie downs

8 Design – Cold Mass Support
Axial nitronic rods 3,850 lb max preload 29,500 lb/in Stiffness Nitronic 50 (200 ksi min yield) 2 for each cavity Transverse nitronic rods 3,300 lb max preload 52,180 lb/in Stiffness 8 for each cavity The rods are used to align the cavities to beamline Rods are incrementally tightened to preload while monitoring alignment Axial rods connect at the FPC ends of the vessels, vessels/cavities contract towards FPC

9 Design – Cold Mass Support
Axial mount at spaceframe Transverse mount at vessel Axial mount at vessel Transverse mount at space frame

10 Design – Thermal Shield Support
Clamps onto space frame 8 shield supports Thermal shields detailed in separate talk

11 Design – Thermal Shield End Supports
15” The Spaceframe support tubes have been extended 15” at the ends to support the end thermal shield assemblies Stiffer supports are currently being considered to replace the standard flat strap Additional supports for the end magnetic shield segments are currently being established

12 Design – Outer Magnetic Shield Support
The outer magnetic shield assembly rests on the space frame support rings and is secured with ¼-20 hardware. 2/ring

13 Tie downs to vessel welds
Design – Tie Downs Tie downs to vessel welds Thick support ring Thin support ring The thick support ring tie downs(3/ring) lifts the space frame through the vacuum vessel and are used for alignment. The thin ring tie downs (3/ring) are lightly snugged after alignment in order to stabilize the reminder of the space frame and to withstand transport loads Thick support ring tie down ¾-10 304 SS Thin support ring tie down ½-13 304 SS

14 Procurement The space frame assembly will be procured as a complete assembly The tie downs will be procured along with the space frame since the tie downs thread into the spaceframe support rings The SOW will be the primary fabrication control document. Drawings will direct fabricators to SOW Fabrication plan/traveler Materials Welding All welds will be considered “code welds”. The drawings will require compliance to AWS D1.6 WPS PQR Dimensional verification Vendor site visits/witnessing Shipping

15 Finalize the thermal and magnetic shield extension supports Drawings
Remaining Finalize the thermal and magnetic shield extension supports Drawings Finalize and review any new drawings Procurement SOW PR  PO

16 Summary Preliminary space frame design is in good shape
Interfaces with other subsystems have been verified Existing drawings have been reviewed Shield extension support changes are currently being established. Drawings to show these changes will be created in the near future Procurement path understood

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