CRYO PIPING & INTER-MODULE CONNECTIONS

1. CRYO PIPING & INTER-MODULE CONNECTIONS Yun He, Daniel Sabol, Joe Conway External Review of MLC Daniel Sabol, MLC External Review

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

3. SS retainers welded HGRP 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. Daniel Sabol, MLC External Review

4. Fixed pipe anchors 40/80K Support Structure Pipes will move 15.5 mm relative to the valves 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? Daniel Sabol, MLC External Review

5. JT PC Axial displacement of ports relative to valves (Fixed center post to fixed valve location) 5K JT Cryogenic Valve Connections 5K PC 40K 40K • 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. Daniel Sabol, MLC External Review

6. 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. • Transitions: • Explosion bonded transitions used for the 40K shield (Al – SS) & HOM’s (Ti – SS). Daniel Sabol, MLC External Review

7. 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) Axial displacement due to thermal contractions of materials when cooled Daniel Sabol, MLC External Review

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

9. 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? Daniel Sabol, MLC External Review

10. Inter-module Connections Space allowed for orbital weld head. Inter-module connection point Daniel Sabol, MLC External Review

11. Interconnection module & Beamline interconnection HGRP Connection Interconnection Module Beamline Interconnection Daniel Sabol, MLC External Review

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