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SNS/SNS-PPU Cryomodule Shipping

Learn about the SNS shipping system for cryomodules and proposed actions for SNS-PPU shipping. Explore lessons from past tests to improve future transportation practices for sensitive components. Innovate the shipping fixture for optimal performance.

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SNS/SNS-PPU Cryomodule Shipping

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  1. SNS/SNS-PPU Cryomodule Shipping Naeem Huque

  2. Introduction • Twenty four SNS Cryomodules were shipping 500 miles from JLab to ORNL • The same shipping system will be used to transport SNS-PPU cryomodules • Small changes to the system will be implemented to take CM design changes into account

  3. SNS Shipping System • Shipping Fixture consisted of two frames, separated by 12 helical isolator springs (Aeroflex CB1500-15-C2) • 1 inch thick rubber between CM and cradles on the inner frame • Fixture is designed to reduce shocks by a factor of 6 • Cryomodules held on to the frame by ratchetting straps • Shipping assembly was fitted on a drop-trailer with air-ride suspension • SNS CMs were designed to withstand: • Vertical: +/- 4.0g • Beam-Axis: +/- 5.0g • Transverse +/- 1.5g

  4. SNS Shipping Tests • A preliminary test was carried out at JLab using a Quarter-Cryomodule (2000) • The QCM was fixed to a rigid frame, with 1 inch of rubber padding on the cradles • Sensors to measure vibration and shocks • QCM was cold tested after the road test • After the test, vacuums and cavity passbands were unchanged • One beamline flange moved 0.3mm (vs. +/- 0.5mm spec) • All shocks were below the SNS design loads

  5. SNS Shipping Tests • The test was repeated with the prototype High-Beta cryomodule (2002) • The CM was loaded on to the shipping fixture, and the assembly installed on a trailer fitted with Air-Ride suspension • The load was driven 400 miles around Virginia • The inner conductor of the FPC was restrained • Maximum shocks all within design limits • Shipping Fixture deemed successful

  6. SNS Production Shipping • After successful road tests, SNS cryomodules shipped to ORNL at a rate of one per month • Shocks and vibration data were recorded for all shipments • High shock was recorded while loading the CM into the fixture; procedure was modified to be ‘softer’ • Highest shocks were found to be at the ORNL gate! • One cryomodule, HB01 suffered a beamline vacuum leak during shipment • Not initially reported, and CM functioned with field emission and lower energy • The Shipping Fixture is to be modified (due to changes in End Can design) to transport 7 SNS-PPU cryomodules to ORNL from JLab in 2021

  7. Proposed Actions for SNS-PPU • Conduct a new road test using a SNS-PPU CM • CM and its sensitive components will be fully instrumented, taking into account lessons from LCLS-II shipping instrumentation • Develop a vibration specification in addition to the shock load specifications • Modify the SNS Shipping Fixture for the new SNS-PPU CM design • Components such as springs and hardware will be replaced

  8. Cryomodule Shipping Lessons • Install maintenance ports on vacuum vessels • Tuner access ports on LCLS-II CMs have been used for nearly everything but repairing tuners • Conduct shipping road tests prior to starting production shipments • Include shock and vibration spectra separately when creating a shipping specification • Consider sub-component testing of sensitive items (e.g. couplers, tuners, bellows) • Ensure assembly used as testing bed is identical (in sensitive regions at least) to production units • Involve industry at an early stage of shipping scheme development • In addition to paid consultants, some specialized transportation companies may provide advice as part of bidding process • Only employ companies that work with special loads • Variables such as route, speed, road conditions and weather cannot be controlled; a shipping system should be able to handle deviations

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