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Millimeter-wave beam scattering and induced broadening by plasma turbulence in the TCV tokamak

O. Chellaï, S. Alberti, I. Furno, T. Goodman, O. Maj, G. Merlo, E. Poli, P. Ricci, F. Riva, H. Weber2021年被引用 15Nuclear FusionIF 3出版社

The scattering of millimeter-wave beams from electron density fluctuations and the associated beam broadening are experimentally demonstrated. Using a dedicated setup, instantaneous deflection and (de-)focusing of the beam due to density blobs on the beam path are shown to agree with full-wave simulations. The detected time-averaged wave power transmitted through the turbulent plasma is reproduced by the radiative-transfer model implemented in the WKBeam code, which predicts a ∼50% turbulence-induced broadening of the beam cross-section. The role of core turbulence for the considered geometry is highlighted.

日本語訳

ミリ波ビームの電子密度揺らぎによる散乱と、それに伴うビームの広がりが実験的に実証された。専用のセットアップを用いて、ビーム経路上の密度ブロブによるビームの瞬間的な偏向および(デ)フォーカシングが、フル波シミュレーションと一致することが示された。乱流プラズマを透過した検出された時間平均波動パワーは、WKBeamコードに実装された放射輸送モデルによって再現され、このモデルはビーム断面の約50%の乱流誘起広がりを予測する。考慮された幾何学形状に対するコア乱流の役割が強調される。

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TCVPlasma turbulence
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