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Report No.
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An Assessment of ITER scenarios under varying assumptions of NBI and LHCD capability

Oikawa, Toshihiro; Polevoi, A. R.*; Mukhovatov, V.*; Shimada, Michiya; Bonoli, P.*; Campbell, D.*; Chuyanov, V.*

In the ITER design review, reducing the NBI energy is proposed for increasing the plasma rotation. NBI capability is assessed for various design assumptions. In the D-T operation, reliable operation would be obtained well above the H-L transition boundary. In the hydrogen operation, the beam energy has to be less than 500keV due to the NBI shinethrough, and the H-mode operation regime is narrow. The NBI central heating at high density necessary for the ITER mission is difficult at 500keV. NB current drive decreases by 20% at 750keV, which makes it difficult to prospect the steady state scenario. The rotation increases by 13% at 750keV. Based on recent experiments, however, MHD instabilities can be suppressed at a rotation velocity available with 1MeV NBIs. A steady state scenario using LHCD is explored with a transport code employing a LHCD code. With a reasonable HH=1.4, 93% of the plasma current is no-inductively driven, and hence the pulse duration is extended to the machine limit.

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