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NCSX Cryostat WBS171 VV Interfaces (A hodge-podge of slides)

NCSX Cryostat WBS171 VV Interfaces (A hodge-podge of slides). Keeping with the modular concept, the cryostat is an array of panels edge-bolted together. Holes are provided for port extensions, coil services, and diag services. Joint / VV Penetration Design.

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NCSX Cryostat WBS171 VV Interfaces (A hodge-podge of slides)

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  1. NCSX Cryostat WBS171 VV Interfaces (A hodge-podge of slides)

  2. Keeping with the modular concept, the cryostat is an array of panels edge-bolted together. Holes are provided for port extensions, coil services, and diag services

  3. Joint / VV Penetration Design Layers of over-thick resilient foam with PTFE tape on the edges serve as the packing for joints and for MOST penetrations Multiple PTFE membranes end reliance on a single inboard seal This scheme is fully serviceable from the outside of the cryostat. A final circular bead (not shown) seals the joint from atmosphere

  4. Inner & outer boot is historically (C-Mod) fiberglass cloth impregnated with Dow silicone compound The penetrations be entirely serviceable from the exterior of the machine Our ever-growing concern about confined spaces AND time-for-rescue tends to call for exterior serviceability Penetration Basics

  5. Typical Penetrations

  6. Interface Control (Scope Sheets) • The midplane is busy and evolving • BUT the VV drives the cryostat design – This is understood

  7. VERTICAL PORT (12) CRYOSTAT INTERFACE plg 3/24/05 Port 6.0 Flange (150 C) Bellows Seal Boot 4.38 Ref Flange Heater Leads/ Thermo- couples/ 1 Loops CRYOSTAT Mount Post (80 K) Insulation fill (Nanogel beads) 1.16 3.31 1 1/4" Pipe Ring Headers "U" Bracket Notes 1. Feedthrough shown is projected view. Port Extension Actual location lies within 6" region. 0.5" Insulation (Microtherm) 5/16" Coolant Tubes (390 C) 1" Insulation (Microtherm) WBS-12’ers seem to favor aerogel insulation. Its use in horizontal penetrations may nullify the settling issue. Keeping control of the “sand” may be a design challenge. A fairly small flaw in the containment might allow serious leakage. Development here may pay big dividends (0.011 W/mK vs. 0.027 for Trymer AND easy to pour)

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