Vacuum Integration CWT Niklas Templeton 25012018 1 Vacuum

Vacuum Integration & CWT Niklas Templeton 25/01/2018 1

Vacuum Integration & CWT • Reference Designs • Constraints • Preliminary Calculations • Design Options • Thermal Analysis 2

DQW CWT & Vacuum Integration 3

DQW CWT & Vacuum Integration Location Reaction (W) 300 K 0. 66 80 K -0. 62 2 K -0. 04 4

CWT 11 T Dipole Interconnect CWT drift tube total length (mm) PIM position L 2 (mm) L 4 (mm) Heat load 5 K including radiation (W) Heat load 70 K including radiation (W) Short 148 mm Upstream 0 mm 148 mm 2, 30 W Long 214 mm Downstream 66 mm 148 mm 1, 23 W 3, 49 W Design of beam lines inside 11 T dipoles and TCLD collimators cryostats (Q. Deliege) https: //indico. cern. ch/event/528126/attachments/1288605/1918296/VSC_Seminar_QD_10_06_2016. pdf Average on both CWTs 1, 68 W 2, 90 W 5

CWT Requirements & Constraints • 4 CWT Tubes • 4 x DN 63 Vac. Instrument. Ports • • Copper Plated Tube • • Screened Bellows 80 K Thermalisation Cavity & Beam Screen Interface 6

Preliminary Calculation – No Bellows Preliminary Calculation of single beam tube (2 mm thick) to determine the need for bellows to reduce heat leak http: //cryogenics. nist. gov/MProps. MAY/ 7

Preliminary Calculation – Length Sweep L 1 (mm) L 2 (mm) Q 300 (W) Q 80 (W) Q 2 (W) 90 280 15. 6 -14. 8 -0. 7 140 230 10. 0 -9. 2 -0. 9 190 7. 4 -6. 3 -1. 0 230 140 6. 1 -4. 7 -1. 4 280 90 5. 0 -2. 9 -2. 1 Weighting function of low-temperature refrigeration exergetic cost (Advances in Cryogenic Engineering, Volume 43, Peter Kittel) Comments: • Minima occurs ~ midpoint • Heaters required @ 300 K • 80 K Load ≈ 4 x 6. 3 W ≈ 25 W • 2 K Load ≈ 4 W Conclusion: 80 & 2 K Static Loads are too high for simple 2 mm thick tube 8

Preliminary Calculation – Thickness Sweep 80 K Intercept fixed at midpoint Q 80 190 t t (mm) Q 300 (W) Q 80 (W) Q 2 (W) 2 7. 38 -6. 35 -1. 03 1. 5 5. 58 -4. 80 -0. 78 1 3. 74 -3. 22 -0. 52 0. 5 1. 89 -1. 63 -0. 26 Q 2 Q 300 Comments: 380 • Thinning beam tube reduces heat load • Relationship is linear 0. 5 mm tube gives: • 80 K Load = 6. 5 W • 2 K Load = 1 W 0. 5 mm tube seems feasible (thermally) Mechanical feasibility to be checked… 9

Preliminary Calculation – Copper Plating Calculation to estimate heat leak through copper plated layer Q 80 L t = 4 ± 1µm L (mm) Q 300 Q (W) 3 µm 4 µm 5 µm 100 0. 14 0. 19 0. 23 150 0. 09 0. 12 0. 15 200 0. 07 0. 09 0. 12 Comments: • Some heat transfer occurs from 300 - 80 K via beamtube copper plating • Approximately 0. 1 - 0. 2 W Load can be neglected at this stage of analysis Thermal Conductivity (kcu) of Coppers with Different Purities (Cryocomp, Hepak, CRYODATA software, Cryodata Inc. 1999) 10

Thin Tube + Bellows Design Staggered Valves (Assembled Last) Welded Interface Beam Screen Cu Tube DN 63 Vac Instrumentation Ports Cu. Be Fingers t = 0. 5 mm 146 Cavity 132 L Plate for Fastener Access 11

Thin Tube + Bellows Thermal Analysis 0. 97 W total Heat Flow, Q 300 K Top 0. 97 W total 300 K 4. 81 W total 80 K intercepts -5. 40 W total 2 K Beam -0. 16 W 2 K Screen -0. 21 W Assumptions -5. 40 W total 4. 81 W total • Fully Welded – Perfectly bonded connections • Spring Fingers & Bellows Screen Excluded • Dynamic Heat Load Neglected • Radiative Heat Loads Neglected -0. 16 W -0. 21 W 12

Double Bellows Design Staggered Valves (Assembled Last) Welded Interface Single Spring Fingers Option Beam Screen DN 63 Vac Instrumentation Ports Cu Tube Cu. Be Fingers Cavity Double Spring Fingers Option L Plate for Fastener Access 13

Double Bellows Thermal Analysis 0. 15 W total Heat Flow, Q 300 K Top 0. 15 W total 300 K 2. 03 W total 80 K intercepts -1. 81 W total 2 K Beam -0. 16 W 2 K Screen -0. 21 W Shielding Temperature 2. 03 W total Screen Tube 278 K Screen Fingers 79 K Beam Fingers 1 278 K Beam Tube 81 K Beam Fingers 2 2 K -1. 81 W total -0. 16 W -0. 21 W 14

Shielded Bellows Temperatures 2 K 79 K 81 K 278 K Single Spring Fingers Option Double Spring Fingers Option 15

Thin Tube + Bellows Summary Thin Tube + Bellows • Higher 80 K load • Simpler bellows shielding • Complex Vac. Inst. port integration Double Bellows • Lower 80 K load • More complex bellows shielding • Greater welding requirement Double Bellows CWT Option 80 K Heat Load 2 K Heat Load (W) Thin Tube + Bellows 5. 40 0. 37 Double Bellows 1. 81 0. 37 Total Static Budget for SPS DQW 240 16. 8 16

Questions / Discussion 17

All Gasket Vacuum Integration Option DN 160 Gate Valves Staggered for Integration/assembly DN 100 Vacuum Vessel Interface DN 160 DN 100 Gate Valve Interface DN 100 18

CWT Side Section 19

Plug-in module + Cold Warm Transition § Cold warm transition (CWT): § The cryomodule doesn’t shrink & it holds the sector valve. § The same concept as LSS 1, 2, 5&8 Q 1 cold warm transition. § Is not attached to thermal shield as in LHC CWT. Beam slotted screen § Material: § Stainless steel + copper plating layer (thickness 4 ± 1µm). § Instrumentation port with beam shield (ID 60 mm & DN 63 flange). § Plug-in module: § To be sized from a standard LHC plug-in module. § LHC reference: LHCVBMV_0002. Thermal shield Cooper braids 2 K logo area 80 K 80 -300 K Cryomodule Pablo Santos Díaz - Conceptual design of the Crab Cavities vacuum system - 26 th October 2017 20