Helium exhaust in divertor-closure configuration with W-shaped divertor of JT-60U

  • Sakasai A
  • Takenaga H
  • Kubo H
 et al. 
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Abstract

The W-shaped divertor of JT-60U was modified from inner-leg pumping to both-leg pumping. After the modification, the pumping rate was remarkably improved with both-leg pumping in a divertor-closure configuration, which means both separatrixes close to the divertor slots. In steady state, efficient helium exhaust was realized in a divertor-closure configuration with both-leg pumping in ELMy H-mode plasmas. A global particle confinement time of τ*He= 0.4 s and τ*He/τE= 3 was achieved in attached plasmas, well within the range generally considered necessary for successful operation of a future fusion reactor, such as ITER-FEAT. The helium exhaust efficiency in the divertor-closure configuration was extended by 45% as compared to the one with inner-leg pumping. In the high X-point configuration with both-leg pumping, the helium exhaust efficiency and the pumping rate of deuterium deteriorated because of the backflow through the outer slot.

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Authors

  • A. Sakasai

  • H. Takenaga

  • H. Kubo

  • N. Akino

  • S. Higashijima

  • S. Sakurai

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