DFX Design Concepts Update Meeting objective consolidating interface

DFX – Design Concepts Update Meeting objective: consolidating interface items Y Yang 1

Status of Interface Items (1) Interface Cryogenics Ready or Proposed LHe/GHe profile Top filling of LHe Constraints SC-Link LTS bus-bar Heater redundancy: cooling the link by gas line The length of SC Link splices (700 mm) and LHe level (250 mm) above accommodated with verall height constraints 250 mm overall space for bending from vertical to horizontal 2 Actions Positive slope from D 1 Diameter of the interface flexible hose DFX top outer flange diameter 850 mm Access by ports size (320 mm) Thermal shield Return of excess GHe Manifold to cryo jumper Addition on a cryo-line, feasibility study DFB heat load Welding space optimization SC-Link outer vessel flange size LHe safety vent size Stake Holders VP/YL/SOTON SC SOTON/VP/ YL/SC SC/SOTON/RB Actions Required for Concept Review Done Optional SC RB AB/PR/RB VP, YL Optional Yes Optional Verify/confirm # access ports d. I/dt calculation on LTS bus-bars Bus-bars mock up to check bending AB/JF SOTON, JF Done No Optional JF Optional 2

Status of Interface Items (2) Interface LTS/LTS splices SC-Link Instrumentations Control instrumentations Ready or Proposed A horizontal splice box on the size of the vertical DFX Routing inside DFX to warm feedthroughs Routing/siting of heaters and level gauges Constraints Actions Inner and outer diameter for connections to the vertical DFX Heat conduction LTS/LTS splice location and LTS length Number of LTS/LTS splice units Fix point / flexibility Evaluate alternatives List of instrumentations Stake Holders AB/JF AB/VP/SC AB/JF No No AB/JF JF Optional No Heat conduction Heater dimensions Level gauge dimensions Replacement in situ 1 required Alternative level gauges and/or qualifications 1 Maximum space reservations and sharing with other provisions 1 Alternative heaters, redundancy, replacement AB/VP/SC Done SC VP/YL/SC Done (Serge email) Optional SC, RB Done (Serge email) D 1 plug positioning VP/YL No D 1 plug Connected with a length of flexible cryostat Actions Required for Concept Review No 3

Status of Interface Items (3) Interface Mechanical Ready or Proposed Concept complete (thermal contraction, assembly sequence) Constraints Geometric Actions Mechanical support options Assembly/installation steps (already done, will be presented meeting) Stake Holders SOTON/VP/YL SOTON/YL Actions Required for Concept Review Optional Yes SOTON/AB/VP Vacuum Barrier as baseline Pumping ports including DSH No 4

Agenda 1. Update on DFX assembly/integration in LTC tunnel 2. Instrumentation feedthrough options 3. Mechanical design updates 5

Instrumentations 1. LHC magnet instrumentations feedthrough from the coldmass can be an option for the DFX if avoiding feedthrough using flexible interface hoses is desire. 2. It becomes a CERN item either for wires insertion during installation or premanufactured for soldering to instrumentation wires in the DFX 3. JF/AB and VP/YL to discuss and decide 6

Mechanical Design 1. 2. 3. 4. Vacuum barrier: The current Cryoworld design has a built-in barrier Should it be abandoned and replaced by the DFX barrier (as in the current design) Proven to work well in the Demo 1 test (? ) Simplifies DFX design 7