Cryomodule Assembly Plan SNS PPU CRYOMODULE PDR Cryomodule Assembly Plan Kurt Macha Mark Wiseman Wednesday, February 27, 2019

Outline Four major assembly steps Clean Room Assembly (earlier talk by K. Wilson) Cold Mass Assembly Thermal Shield/Space Frame Assembly Cryomodule Final assembly Will go through each of the assemblies showing a combination of old photos and CAD images Current assembly plan is based on the original SNS CM build plan Will highlight planned changes from the original plan with new tooling requirements

Cavity string transfer to cryomodule assembly Maintain and monitor the cavity vacuum via an ion pump Warm to cold beam-pipe bellows will be included in the clean room assembly

Cold mass assembly Cryogenic piping and leak testing 2K circuit 5K FPC 4K piping to HX Tuner installation Liquid level & Heaters Wiring & 2k heat stationing Diodes Mounting & 2k heat stationing Primary magnetic shielding Install coupler bellows & leak test 2k insulation

2K circuit welding Where possible orbital welding may be used Increased quality of welds Saves production time Reduces risk of leaks

Spaceframe/ thermal shield assembly Transfer the cavity string into the spaceframe and remove the lollipop tooling

Preparation for string transfer to spaceframe Install the shield into the spaceframe Assemble the spaceframe/ shield onto the rail tooling Support in proper locations and observe deflections for alignment concerns Leak test the thermal shield Insulate the 50k shield Axial restraint rods get inserted loosely Slide the spaceframe over the cavity string assembly Use caution around the couplers, the interferences will need attention Ensure the coupler ceramic windows are protected Protect the coupler bellows Spaceframe tooling

Transfer of the string load to the spaceframe Install the axial and radial nitronic rods Carefully tension the nitronic rods to ensure minimal beam-line movement during load transfer Remove the lollipops Track the beamline movement with dial indicators Install the lower spaceframe ring ties

Cavity string alignment Align the cavity string One arm alignment arms mounted on the cavity flange and leveled using a precision level Target at the and of the arm will have a target that can be sighted for adjustment into position Alignment Arm

Routing and heat stationing of instrumentation The RF cables require routing from the 50k shield out of the insulation Diode wiring will be routed Heater and liquid level wiring will be staged at the ends for further routing Instrumentation verification check TDR checks for the RF cables Diodes will receive meter verification to ensure no shorts

Final spaceframe assembly Install the bottom thermal shield panels and MLI patches Run and weld the coupler exhaust connections Inspect and leak test connections Install the outer magnetic shield onto the spaceframe Test fit spaceframe lockdowns Ensure proper clearances around the couplers

Vacuum vessel / end can assembly Install the vacuum vessel onto carriage assemblies and stage next to the spaceframe Vacuum Vessel Tooling Portable Rail Cart

Spaceframe insertion into the vacuum vessel Roll the spaceframe into the vacuum vessel

Alignment of the spaceframe into the vacuum vessel Center BL Flange To Vacuum Vessel Flange Align the spaceframe in the center of the vacuum vessel Investigating differential screws for fine adjustment Install and secure all lockdowns Final welding and leak test of the 5K coupler circuit Fiducialize the vacuum vessel to reference beam center Crane the vacuum vessel assembly to a new work center, install saddles and set the assembly on concrete blocks

End can installation Secure each end can to the vacuum vessel New tooling will hold and adjust the end cans to the vacuum vessel until secured Bayonets will be properly positioned allowing the bellows, rotatable flange and interface block to give compliance The vacuum vessel end plates will remain off to allow installation of 2k, 4k and shield piping. After the piping is welded and leak tested, the end cap thermal, Mu shielding and MLI will be installed. Install the top-hats Supply End Can Return End Can

Beamline assembly Install the end can plates to seal the ends of the vacuum vessel Install the final beam line sections using portable clean room work spaces Extra precautions to ensure reduced particulate. Slow pump and slow backfills will be done using improved equipment and procedures

Vacuum vessel final Final wiring and instrumentation check Test run stepper motors Install the JT actuators and test Final Alignment verification Close all vacuum vessel ports Vacuum vessel evacuation and leak test Pressure test the inner circuits as part of the final leak test (Leak detector on insulating vacuum)

Conclusion New tooling will be needed for end can installation Kurt Macha Mark Wiseman Conclusion New tooling will be needed for end can installation Most procedures are in place from the original build Main difference is the end can installation and end sections of the vacuum vessel The alignment of the spaceframe is more critical due to no beamline adjustment at the ends