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Electric field determination in the plasma-antenna boundary of a lower-hybrid wave launcher in Tore Supra through dynamic Stark-effect spectroscopy

E H Martin, M Goniche, C C Klepper, J Hillairet, R C Isler, C Bottereau, L Colas, A Ekedahl, S Panayotis, B Pegourie2015年Plasma Physics and Controlled FusionIF 2.2出版社

Interaction of radio-frequency (RF) waves with the plasma in the near-field of a high-power wave launcher is now seen to be an important topic, both in understanding the channeling of these waves through the plasma boundary and in avoiding power losses in the edge. In a recent Letter, a direct non-intrusive measurement of a near antenna RF electric field in the range of lower hybrid (LH) frequencies (ELH) was announced (2013 Phys. Rev. Lett.110 215005). This measurement was achieved through the fitting of Balmer series deuterium spectral lines utilizing a time dependent (dynamic) Stark effect model. In this article, the analysis of the spectral data is discussed in detail and applied to a larger range of measurements and the accuracy and limitations of the experimental technique are investigated. It was found through an analysis of numerous Tore Supra discharges that good quantitative agreement exists between the measured and full-wave modeled ELH when the launched power exceeds 0.5 MW. For low power the measurement becomes inaccurate utilizing the implemented passive spectroscopic technique because the spectral noise overwhelms the effect of the RF electric field on the line profile. Additionally, effects of the ponderomotive force are suspected at sufficiently high power.

日本語訳

無線周波数(RF)波と高パワー波動ランチャーの近傍場におけるプラズマとの相互作用は、プラズマ境界を通る波動の伝播を理解する上でも、エッジにおける電力損失を回避する上でも、現在では重要なテーマとなっている。最近のレターにおいて、低混成(LH)周波数帯(ELH)におけるアンテナ近傍のRF電場の直接的非侵襲測定が発表された(2013 Phys. Rev. Lett. 110 215005)。この測定は、時間依存(動的)シュタルク効果モデルを用いたバルマー系列重水素スペクトル線のフィッティングによって達成された。本論文では、スペクトルデータの解析を詳細に論じ、より広範囲の測定に適用し、実験手法の精度と限界を検討する。多数のTore Supra放電の解析を通じて、投入パワーが0.5 MWを超える場合、測定値とフル波モデルによるELHの間に良好な一致が存在することが見出された。低パワーでは、スペクトルノイズが線プロファイルに対するRF電場の影響を覆い隠すため、実装された受動分光技術を用いた測定は不正確になる。さらに、十分に高いパワーでは、ポンデロモーティブ力の影響が疑われる。

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