Conceptual Specifications for DFX boxes WP 6 a

Conceptual Specifications for DFX boxes WP 6 a DFX Meetings 1

Conceptual specifications § Integration: & installation § § Cryogenics Number of SC-Link cables: fixed Number of LTS bus-bar : fixed Mg. B 2/LTS and LTS/LTS Splice location: fixed in principle / evolving in details Installation Integration LTS//Plug Transport Maintenance DFX design Cryogenic layout § § DFX interfaces DFX located in the LHC tunnel: fixed Electrical layout : § § CERN EDMS 1905633 Insulation Vacuum Common helium volume with SCLink: fixed Generated mass flow to control Mg. B 2 -HTS splice and CL temperatures: fixed Thermal contractions approach for DFX: Cryostat: fixed Mg. B 2/LTS, LTS/LTS: fixed SC-Link: in progress/descoping SCLink Test Vacuum layout § § Separated insulation vacuum with SCLink: fixed Shared insulation vacuum with current leads: fixed DF CL SCLink PC DFH Triplet Cryostat Magnet D 1 DF LHC tunnel UL UR Superfluid @ 1. 9 K Liquid He @ 4. 5 K Gaseous He Heater Vacuum Barrier HTS Mg. B 2 Nb. Ti Warm cable Splice DFX SCLink DSHx DFHx LTS 2 x 18 k. A 2 x 13 k. A 3 x 7 k. A 12 x 2 k. A Type 18 k. A Type 2 k. A

DFX functional specifications DFX Electrical § § Ensure continuity between Mg. B 2 and LTS bus-bar Ensure integrity of cables (transport, installation, thermal cycles) Provide volume, access and protection for splices LTS-LTS Ensure instrumentation acquisition (V-taps) 19 LTS cables Rmin=1. 25 m / Fmax= TBC Fixed Cryogenic § § § § Ensure max splices temperature 4. 5 K in liquid Ensure GHE supply to SC-Link and current leads lines : Adapt to cryogenic layout 3 lines / partial active TS TBC Ensure instrumentation acquisition TBC Ensure no condensation on external surfaces Integrate thermal contractions layout scenario Ensure circuits leak tightness 1. 10 -9 mbar. l. s-1 tbc Ensure liquid vessel tightness up to: 5 g/s into SC-Link flexible cryostat TBDesigned TBD Insulation vacuum § § Independent insulation vacuum from SCLink and D 1 Present pumping and instrumentation interfaces see Indico 733790 // Space reservation in LHC tunnel Baseline changes TBC Interface with SCLink (cryostat & cables) : Dimensions fixed Integration § § Installation § § § Interface with LTS bus-bar geometry (cryostat & cables distribution and orientation) TBD Interface with SCLink geometry (cryostat & cables distribution and orientation) Baseline Compatible with allowed manufacturing processes Welding Maintenance § § § Allow required access to LTS-LTS splices Access to Mg. B 2 -LTS spices Extraction from DFX Allow access for inspections and replacement Baseline Safety devices, instrumentation Safety & rules § § Design, manufacture and test to Norms Design safe scenario for pressure relief devices PED 2014 -68 -EU & CERN rules ISO 21013 -3 Cost and logistics § § Minimise length of Mg. B 2 & LTS cables Homogenise manufactured parts & spares ; DFX boxes TBD 3

Overview of DFX concepts evolution 2016 key retained concepts: § § Liquid boil off for producing gas flow Immersion of splices SCLink Mg. B 2 cable with Nb. Ti ends DFX mechanically independent from D 1 and beamline Mid- 2016 : 6 th HL-LHC collaboration meeting 2017 status: § Identification of technical challenges: § § Plug, heaters, Liquid-Gas separation, mechanical interfaces to D 1/SCLink Developing requirements, layouts and assembly needs Early 2018: § § Dedicated jumper for DFX Liquid-Gas separation around cables unfeasible Separate liquid and gas volumes using gravity SCLink cable dives into liquid from the top Mid-2017 : Cold Powering System review Early-2018 4

DFX design analysis Horizontal entry concept: Mid- 2018 SCLink interface: § § § Mg. B 2 -Nb. Ti splices made and tested @ surface rigid SCLink end to handle Rmin ≥ 1. 5 m integration limitations Angled entry Horizontal entry concept: § § Complex and delicate cable handling, DFX assembly, tooling Integration limitations Angled entry: § § § Complex assembly but feasible Bending of Mg. B 2 end compulsory inside the DFX helium reservoir Still a few technical issues to be addressed SOTON presentation July 2018, DFX review meeting, courtesy Y. Yang, W. Bailey Angled entry schematic: July 2018 5

DFX vertical concept Vertical schematic: September 2018 WP 6 a request following the DFX review meeting: § § Handling of Mg. B 2 cable during installation presents a risk of deterioration. WP 6 a requests to study an alternative Vertical entry concept developed: § § § No more final bending of SCLink But complex assembly sequence in limited vertical space Integration limitations with surrounding equipment Vertical schematic: October 2018 Preliminary Iterations: 1. 2. Cryogenics: LHe volume Positive gradient plug/1. 9 K to 4. 5 K Positive gradient LHe-GHe Integration No access to the vertical shaft Space for welder/cutter 6

Topics towards Concept Finalisation § Cryogenics § § § Integration § § LTS/LTS splices: location, layout, preparation, mechanical support, maintainability Splice boxes Instrumentations § § § Space reservation Support, assembly, SC-Link/LTS integration, welding, tooling Uniformity for left/right and P 1/P 5 Optimisations § § § LHe volume LHe layout Control and safety devices Thermal shield Routing: electrical/thermal, cryo Accessibility and maintainability: heaters, level gauges Others? WP 6 a DFX Meetings 7

LHe Volume and Layout: Issues and Solutions DFM Link § Vertical DFX vessel 500 mm ID, >10 min for filling controlled level range § Positive gradient from 1. 9 K to 4. 5 K § Boil-off collected from local plateau feeds into SC-Link vapour space § The issues for the loop? UL Shaft DFX SC Link Splice boil-off feed to SC-Link Cryolines LTS-LTS splice box LHe fill Cryo plug connection box D 1 magnet cryostat LTS extension-to. Cryo plug box DFX Cryostat LTS extension-tosplice box Beamline D 1 Plug

Cryogenic Jumper Connection

Space Reservations for Orbital Welder and Cutter SHOWING SPACE FOR INSTALL OF ORBITAL CUTTING MACHINE CHECKING SPACE FOR INSTALL OF ORBITAL WELDING MACHINE

DFX Design Uniformity DFX - CPS review 3 July 2017 11

DFM Link DFX FACING LEFT IN TUNNEL SC Link Rotation of the top flange (only) Level sensor DFM Link SC Link Beamline Heaters Fischer's and pressure relief

DFX FACUING RIGHT IN TUNNEL DFM Link SC Link Fischer's and pressure relief Heaters Beamline DFM Link Level sensor SC Link