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Observation of radial propagation of electrostatic fluctuations on KT-C tokamak

Guiding Wang, Chang-Xuan Yu, Wandong Liu, Yizhi Wen, Shude Wan2000年Plasma Physics and Controlled FusionIF 2.2出版社

The radial wavenumber spectra of electrostatic fluctuations measured by Langmuir probe arrays on the KT-5C tokamak show a quasimode-like structure which results in a net radial outward propagation of the turbulent fluctuations. The power-averaged radial wavenumber is approximately constant in the core region and increases near the limiter. The radial wavenumber spectral width stays nearly constant from core to edge and is about two times greater than the poloidal wavenumber spectral width. The measured fluctuation levels and wave action fluxes are in good agreement with model predictions (Mattor N and Diamond P H 1994 Phys. Plasmas14002, Mattor N 1995 Phys. Plasmas2766) which suggest that drift wave propagation could be a source of edge turbulence.

日本語訳

KT-5Cトカマクにおけるラングミュアプローブアレイで測定された静電揺動の動径方向波数スペクトルは、準モード様構造を示し、その結果として乱流揺動の正味の動径方向外向き伝播が生じる。パワー平均された動径方向波数は、コア領域ではほぼ一定であり、リミッター近傍で増加する。動径方向波数のスペクトル幅は、コアからエッジまでほぼ一定に保たれ、ポロイダル方向波数のスペクトル幅の約2倍である。測定された揺動レベルと波動作用束は、モデル予測(Mattor N and Diamond P H 1994 Phys. Plasmas 1 4002, Mattor N and Diamond P H 1995 Phys. Plasmas 2 2762)と良好な一致を示し、このモデルはドリフト波伝播がエッジ乱流の源となり得ることを示唆している。

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