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High-Speed imaging of the plasma response to resonant magnetic perturbations in HBT-EP

Sarah M Angelini, Jeffrey P Levesque, Michael E Mauel, Gerald A Navratil2015年Plasma Physics and Controlled FusionIF 2.2出版社

A Phantom v7.3 fast digital camera was used to study visible light fluctuations in the High Beta Tokamak–Extended Pulse (HBT–EP). This video data is the first to be used to analyze and understand the behavior of long wavelength kink perturbations in a wall-stabilized tokamak. The light was mostly comprised of Dα 656 nm light. Profiles of the plasma light at the midplane were hollow with a radial scale length of approximately 4 cm at the plasma edge. The fast camera was also used to measure the plasma's response to applied helical magnetic perturbations. The programmed toroidal phase angle of the resonant magnetic perturbation (RMP) was directly inferred from the resulting images of the plasma response. The plasma response and the intensity of the RMP were compared under different conditions. The resulting amplitude correlations are consistent with previous measurements of the static response using an array of magnetic sensors.

日本語訳

Phantom v3.3高速カメラを用いて、High Beta Tokamak–Extended Pulse(HBT–EP)における可視光の変動を研究した。このビデオデータは、壁安定化トカマクにおける長波長キンク摂動の挙動を分析・理解するために初めて使用された。この光は主にDα 656 nmの発光で構成されていた。赤道面におけるプラズマ光のプロファイルは中空状であり、プラズマ端での動径スケール長は約4 cmであった。また、この高速カメラを用いて、印加されたヘリカル磁気摂動に対するプラズマの応答を測定した。共鳴磁気摂動(RMP)のプログラムされたトロイダル方向位相角は、得られたプラズマ応答の画像から直接推定された。プラズマ応答とRMPの強度は、異なる条件下で比較された。得られた振幅相関は、磁気センサーアレイを用いた静的応答の従来測定結果と一致した。

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Magnetic perturbationResonant magnetic perturbation
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