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December 16, 2005

NCSX Vacuum Vessel Heating and Cooling system R&D. P. Goranson, B. Nelson. December 16, 2005. First VVSA is coming soon. Current Status 1 st VVSA delivery by end of March Heating and cooling system design complete pending specification of heaters Thermal Insulation design nearly complete

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December 16, 2005

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  1. NCSX Vacuum Vessel Heating and Cooling system R&D P. Goranson, B. Nelson December 16, 2005

  2. First VVSA is coming soon • Current Status • 1st VVSA delivery by end of March • Heating and cooling system design complete pending specification of heaters • Thermal Insulation design nearly complete • Structural support design complete, in fabrication at PPPL • I&C design nearly complete

  3. Vacuum Vessel ancillaries defined VV ancillaries include: - flux loops • coolant tubes • thermocouples • headers • diagnostic feed through flanges • lateral supports • pumping/personnel access port • heater tapes

  4. Cooling tube design modified to aid fabrication • Original design based on standard 5/16 o.d. stainless steel tubing, formed to CAD-derived geometry data (per vendor input) • No bids received from vendors • New design uses corrugated stainless tubing with braided reinforcement • Standard product, easy to install, but will it work? Cross section at typical clamp

  5. Loose fill provides better thermal insulation • Original concept used microtherm bats • Required custom flat pattern designs for each of 8 layers • Thickness limited to 2 inches to provide clearance for field period assy • New design uses loose fill of nanogel beads • Inexpensive • Better insulation ( 1/3 heat leak) • Current product not rated to 350C, but expect this will be available soon – adequate alternative is perlite, but will this system work? Aerogel felt around mod coil

  6. We need to test integrated H/C system • Goals • Maybe we can do this on the Rohwedder PVVS

  7. How would we set up Rohwedder PVVS? • Cut port region from Rohwedder PVVS • Ship port region of Rohwedder PVVS to ORNL • Procure cooling tube and associated mounting hardware • Borrow one or more prototype magnetic loops from PPPL • Procure two or more port heater tapes with associated controls • Procure set of thermocouples and associated mounting blocks • Attach cooling tubes, heater tapes, magnetic loops, thermocouples in prototypical manner

  8. How would we set up Rohwedder PVVS? • Fabricate one boot assembly to fit PVVS port • Fabricate mockup of mod coil port opening • Mount mod coil port opening in bottom of container • Mount PVVS with port down in container • Fill space around PVVS segment with loose fill insulation • Heat PVVS by separate heater tapes

  9. How would we use Rohwedder PVVS? • Heat PVVS segment to 150C and: • Demonstrate control of port temperature with heater tape(s) on port extension • Check effectiveness of bead insulation • Turn off heaters and check cooldown via flexible cooling lines • Determine temperature gradient between tubes • Determine heat transfer coefficient • Repeat at various temperatures up to 350C • Dismantle and inspect all parts for damage, degradation

  10. How much would this cost?

  11. Summary

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