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Perpendicular momentum injection by lower hybrid wave in a tokamak

Jungpyo Lee, Felix I Parra, Ron R Parker, Paul T Bonoli2012年Plasma Physics and Controlled FusionIF 2.2出版社

The injection of lower hybrid (LH) waves for current drive into a tokamak affects the profile of intrinsic rotation. In this paper, the momentum deposition by the LH wave on the electrons is studied. Due to the increase in the poloidal momentum of the wave as it propagates into the tokamak, the parallel momentum of the wave increases considerably. The change in the perpendicular momentum of the wave is such that the toroidal angular momentum of the wave is conserved. If the perpendicular momentum transfer via electron Landau damping is ignored, the transfer of the toroidal angular momentum to the plasma will be larger than the injected toroidal angular momentum. A proper quasilinear treatment proves that both perpendicular and parallel momentum are transferred to the electrons. The toroidal angular momentum of the electrons is then transferred to the ions via different mechanisms for the parallel and perpendicular momentum. The perpendicular momentum is transferred to ions through an outward radial electron pinch, while the parallel momentum is transferred through collisions.

日本語訳

低混成(LH)波を電流駆動のためにトカマクへ入射することは、内部回転の分布に影響を与える。本論文では、LH波による電子への運動量付与について研究する。波がトカマク内を伝播するにつれて波のポロイダル運動量が増加するため、波の平行運動量はかなり増大する。波の垂直運動量の変化は、波のトロイダル角運動量が保存されるようなものである。電子ランダウ減衰による垂直運動量輸送を無視した場合、プラズマへのトロイダル角運動量の輸送は、入射されたトロイダル角運動量よりも大きくなる。適切な準線形処理により、垂直運動量と平行運動量の両方が電子に輸送されることが証明される。電子のトロイダル角運動量は、その後、平行運動量と垂直運動量で異なる機構を通じてイオンに輸送される。垂直運動量は外向きの動径方向電子ピンチを通じてイオンに輸送され、一方、平行運動量は衝突を通じて輸送される。

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