ANL HWR CRYOMODULE SHIPPING PLAN PIP2IT Transportation Review Jacob Kilbane August 14, 2018 1
Outline • Cryomodule structure • Overview • Subassemblies and components • Protecting the cryomodule • Transportation mount designs • Vertical • Lateral • Longitudinal • Allowable loads and recommended pre-tension values • Review 2
Cryomodule Structure - Overview • Main components include • Lid Cryomodule • Coldmass Lid • Lower vacuum vessel • Accelerator components are supported on a strongback frame and hung from the lid via six hanger rod assemblies • Lid and coldmass are assembled outside of the lower vacuum vessel and lowered in Coldmass • Additional components are connected through bottom ports after lid installation Hanger rod assemblies • Primary concern is motion of coldmass during shipment Lower vacuum vessel with shields Cavity Magnet Ti “strongback” frame Couplers
Cryomodule Structure - Hanger Rod Assemblies Hanger nut Hanger rod assemblies Hanger plate Hanger nipple • Support the strongback frame, cavities, Hanger plate nut magnets, and other accelerator Hanger plate hardware Hanger nipple • Provide bracing in the lateral and longitudinal direction Ti clevis with pin Turn buckle • Hang from the lid via a nut bearing on a plate • Comprised of titanium and stainless Ti rods steel components Ti “strongback” frame Hanger rod assembly 4
Cryomodule Structure – Strongback, Cavities, Magnets Strongback frame • Primary point of attachment for all beamline components • 2 ” x 8” titanium rails with T-slots Cavities and Magnets • 8 cavities, 8 magnets • 3-point kinematic mounts for alignment • Hold-downs to maintain position on strongback • Four fiducial targets per cavity and magnet for alignment Fiducial targets 5
Protecting the Cryomodule Concerns • Coldmass behaves as rigid body pendulum • Movement of coldmass could damage components and perturb alignment Our solution • Immobilize coldmass within vacuum vessel • Use mounts that tension coldmass from all sides Immobilize and apply tension • Use vibration-dampening mounts between cryomodule and truck bed Vibration-isolating mounts locations 6
Transportation Mount Design – Vertical Mounts Purpose • To restrict vertical motion of strongback Components Aluminum beam • Aluminum beams • Stainless steel coupler port covers with large clearance hole Shoulder • Oversized and spherical washers bolts • Tensioning bolts • Plastic bearing rings Nipple Features G8 bolt HDPE bearing ring • Tension can be controlled by tightening Oversized and (not shown) bolts Labelled components spherical washers are 304/316 SST Flange port cover unless otherwise noted with hole • Permits misalignment of at least ± 0.25” in lateral and longitudinal directions 7
Transportation Mount Design – Lateral Mounts Purpose • To restrict lateral motion of strongback Oversized angular and Clevis spherical Ti pin Components washer • Aluminum strongback brackets Nut • Clevis and pins Flange port • Stainless steel side port covers with large cover with hole G8 threaded clearance hole HDPE rod Aluminum bearing ring • Oversized, angled and spherical washers (not shown) strongback bracket Labelled components are • Tensioning rods 304/316 SST unless otherwise noted • Plastic bearing rings Features • Tension can be controlled by tightening nuts • Permits misalignment of at least ± 0.25” in all directions 8
Transportation Mount Design – Longitudinal Mounts Purpose • To restrict longitudinal motion of strongback Aluminum Components strongback bracket • Aluminum strongback bracket G8 bolt • Stainless steel coupler port covers with large clearance hole • Oversized and spherical washers • Tensioning bolts Aluminum • Plastic bearing rings target plate • Aluminum target plate Flange port 6x 3/8 studs HDPE bearing cover with and nuts not ring (not shown) hole shown Features Oversized, • Tension can be controlled by tightening bolts spherical, and Labelled components are 304/316 SST washer • Permits misalignment of at least ± 0.25” in unless otherwise noted lateral and longitudinal directions • Target plate is removable to give access to fiducial targets after shipment 9
Balance Between Pre-tension and Allowable Load PRO: Pre-tension increases allowable transportation loads CON: Pre-tension increases loads on the mounts and structures Max allowable strength of weakest component with zero pre-tension Loosening Dictated by strength of weakest component Pre-tension that causes immediate failure 10
Selection of Pre-tension Values Longitudinal Vertical Lateral Pre-tension Allowable Limiting Limiting Direction per bolt/rod Transport Condition component [lbf] Load [lbf] Bottom port Vertical 3,000 20,200 Failure Loosening flange cover Mount Side port Lateral 2,000 4,000 loosens flange cover Mount Target port Longitudinal 3,000 6,000 loosens flange cover Comments - Vertical transport load does not cause loosening - Lateral load expected to be smallest 11
Review Concerns • Movement of coldmass could damage components and perturb alignment Solution • Mounts to immobilize strongback in all directions • Pre-tension mounts to increase allowable loads Immobilize and • apply tension Use vibration-dampening mounts between cryomodule and truck bed 12
Questions? 13
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