Plasmas heated by ICRF only in the JET tokamak show distinct structures in the toroidal rotation profile, with regions where dω/dr>0 when the minority cyclotron resonance layer is far off-axis. The rotation is dominantly co-current with a clear off-axis maximum. There is only a slight difference between a high-field side (HFS) or a low-field side position of this resonance layer: the off-axis maximum in the rotation profile is modestly higher for the HFS position. This is in contrast to the predictions of theories that rely mainly on the effects arising from ICRF-driven fast ions to account for ICRF-induced plasma rotation. The differences due to the direction of the antenna spectrum (co- or counter-) are small. A more central deposition of the ICRF power in L-mode and operation in H-mode both lead to more centrally peaked profiles, both in the co-direction. Strong MHD modes brake the rotation and lead to overall flat rotation profiles.
抄録： ICRFのみで加熱されたJETトカマクにおけるトロイダル回転の測定結果を示す。オフ軸ICRF加熱は、オン軸加熱と比較して、より大きなトロイダル回転の変化をもたらすことが観測された。プラズマ中心部では、オン軸ICRF加熱はより強いコ回転方向の駆動を生じる一方、オフ軸加熱はより弱い駆動を示す。周辺部では、オフ軸加熱はより強い対向回転方向の駆動を生じる。ICRFのみで加熱されたプラズマにおける運動量輸送のモデル化には、運動論的効果が重要であることが示唆される。