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Study of Active H2O Cooling for NSTX-U Design

Detailed analysis of engineering assumptions for NSTX-U design: inner and outer leg cooling, divertor cooling, facility cooling, power supplies utilization, and component cooling. Discussion includes pulse lengths, cooling capacities, transformer ratings, and necessary components to ensure efficient operation. Conclusions drawn for maximum current, magnetic field, plasma parameters, and auxiliary power.

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Study of Active H2O Cooling for NSTX-U Design

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  1. NSTX_U Design Point Study Active H2O Cooling Pulse Length 60 sec C Neumeyer 5/19/6

  2. Physics Assumptions

  3. Engineering Assumptions

  4. TF Inner Leg Cooling 200kA/turn 5 kA/cm^2 5.75m 10m/s fW=0.15

  5. TF Outer Leg Cooling 2” x 6” 3kA/cm^2 6.9m 10m/s fW=0.075

  6. PF Cooling R=2m I=15kA J=2.5kA/cm^2 Turn H and W are 1.25 times existing PF coils 10 turns/cooling path 10m/s

  7. Divertor Cooling 4” dia pipes are adequate for divertor supply/return manifolds (assume full power capacity on top and bottom)

  8. Fit inside VV 4” OD pipes 60mm W brush divertor

  9. Facility Cooling TFTR ratings (may not be available anymore TBD)… Water tank = 33000 gallons (adequate) Cooling power = 20MW (adequate) Component cooling = 3300 GPM (~ 1/4 of requirement)

  10. Power Supplies Use PS at 15kA per PSS (continuous rating of SCRs) Rep rate limited to ~ 1200s min due to 3.25kA rms rating Xfmrs OK (8 hrs) 5 parallel 750MCM per PSS ~ 50 parallel 1000MCM cables req’d for 200kA-60s/1200s

  11. Approach Maximize Ip allowing solver to adjust of Jcu in inner and outer legs of TF subject to outer legs <= 2*CSA of existing

  12. Ip vs. A

  13. Bt vs. A

  14. Solenoid Flux vs. A

  15. P_aux vs. A

  16. Conclusions How about…. A = 1.75 Ip = 3.0MA Bt = 1.5T oh = 1.5V-s P_aux = 30MW

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