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(EXP4/05) Divertor Charactersitics and Control on the W-SHaped Divertor with Pump of JT-60U

(This paper was rapporteured in lecture EX3/1)

N. Hosogane, H. Kubo, S. Higashijima, K. Itami, K. Shimizu, H. Takenaga, H. Tamai, S. Konoshima, N. Asakura, S. Sakurai, A. Sakasai, T. Ishijima^*, M. Shimada and the JT-60 Team

Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193, Japan
^* University of Tsukuba, 1-1-1, Tnnoudai, Tsukuba-shi, Ibaraki-ken, 305-0006, Japan

Abstract.  Roles of the inner leg pumping and the private dome, which are special features of the W-shaped divertor of JT-60U, have been investigated. The following observations were made: The inner leg pumping functions well in attached states or partially detached states with weak X-point MARFE where the inner particle recycling is enhanced. A combination of main gas puff and inner leg pump is effective in reduction of intrinsic carbon impurity. Geometrical effects of the private dome on transport of hydrocarbons in the private flux region was confirmed by spectroscopic measurements of CD-band intensity profile and impurity transport simulation code using experimental data.

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