CRYO PIPING & INTER-MODULE CONNECTIONS Yun He, Daniel Sabol, Joe Conway External Review of MLC Daniel Sabol, MLC External Review 10/3/2012

2 2K supply Sub-cooled bar 40K supply 20 bar HGRP 1.8K Gas 2K 10/3/2012Daniel Sabol, MLC External Review Cryogenic Piping Layout 40K Shield 20 bar 4.5K Supply 3 bar 6K Return 3 bar 80K Return 20 bar 2K-2Phase Precool 1.2 bar 5K Forward 40K Local

5K Fixed Supports Fixed pipe supports will be used near the valves for the 2K, 4.5K and 6K pipes. We will use tabs welded to HGRP, G-10 brackets and SS retainers tack welded to the 50 mm pipes. Pressure is 3 bar. HGRP will move 7.5 mm relative to valves. SS retainers welded 310/3/2012Daniel Sabol, MLC External Review HGRP

40/80K Support Structure The 40K & 80K pipes will be anchored to the radiation shield on the valve end. Substantial force will be transmitted to the 40K shield (1560 lbs.) by each line due to the 20 bar internal pressure. Forces may tend to balance until the end modules. We have not analyzed the structure yet. Thoughts? Fixed pipe anchors 410/3/2012Daniel Sabol, MLC External Review Pipes will move 15.5 mm relative to the valves

Cryogenic Valve Connections 510/3/2012Daniel Sabol, MLC External Review JT PC 40K 5K 40K 5K PC JT Axial displacement of ports relative to valves (Fixed center post to fixed valve location) HGRP (4K)7.5 mm 40K Shield15.5 mm The jumpers between the valves and various pipes will need bellows or loops to accommodate the thermal contraction (final version not shown). All orbital welded connections.

Cryogenic Valves & Connections Cryogenic Valves:  (4) Weka bellows sealed valves and positioners per module.  10 mm bore, 10 mm travel.  600 mm length.  Available 10 or 25 bar models.  Heat leak.28 watts with thermal intercept (300 – 4k).  Shown with 90 degree orbital weld elbow.  ~ $9k each. 610/3/2012Daniel Sabol, MLC External Review Transitions:  Explosion bonded transitions used for the 40K shield (Al – SS) & HOM’s (Ti – SS).

50mm Bellows The 50mm (pipe ends) x ~355mm (14”) bellows will have a single braid shield to handle the 20 bar pressure and will be compressed warm ~ 32mm for the SS lines and 35mm for the Al extrusion line to compensate for contraction when cooled. We have added a inner tube on the bellows to eliminate vibrations. Should we be considering alternate bellows designs (external tube retainer, no braid, pre-pipe fixed point offsets) ComponentsMaterialTemperature∆L/L∆LBellows HGRPTi300K-2K0.172%17 mmTi 2K,5K, 40KSS300K-2K0.319%31.5 mmSS 40K extrusionAL K-40K0.350%34.5 mmSS, SS-AL transition Axial displacement due to thermal contractions of materials when cooled 710/3/2012Daniel Sabol, MLC External Review

5K & Precool Jumpers 8 5K jumper connects cooling of two ends of HOM absorbers and the coupler for each cavity 6 mm LHe vessel pre-cool lines 6 mm Local precool 20 mm Local 5K supply 12.7 mm 10/3/2012Daniel Sabol, MLC External Review

Inter-module connections 270 mm TI HGRP - Field hand weld (6) 50 mm SS pipes – Use fixture to align, hand tack and orbital weld. Bellows will be pre-compressed. Beam line vacuum connection will use portable clean room. Bolted (one side) radiation shield insert, CM shield needs to extend beyond flanges on each end. Should all joints be aligned on one plane? 910/3/2012Daniel Sabol, MLC External Review

Inter-module Connections Inter-module connection point 1010/3/2012Daniel Sabol, MLC External Review Space allowed for orbital weld head.

11 Interconnection module & Beamline interconnection Interconnection Module Beamline Interconnection 10/3/2012Daniel Sabol, MLC External Review HGRP Connection

12 Interconnection Module & Beamline Interconnection Port for gate valve Port for access to tuner Pump-out port w/ RF screen of “shower drain” hole patterns Flexible joint with RF shielding  Flexible section for making connection of two modules  Will be locked after connection is made  Should we allow for expansion? (vacuum incident when cold) 10/3/2012Daniel Sabol, MLC External Review