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Emissivity toroidal asymmetries induced by ECRH driven convective fluxes in the TJ-II stellarator

M A Ochando, F Medina, the TJ-II Team2003年Plasma Physics and Controlled FusionIF 2.2出版社

Intermittent toroidal asymmetries in the plasma edge emissivity have been detected in the TJ-II stellarator. During the toroidal radiation asymmetry phase (TRAP), sharp up and down jumps in electron cyclotron emission and total radiation are observed. The time resolved soft x-ray spectra also show changes in the suprathermal electron population. Given that the asymmetries reveal a variation in the wall desorption near the gyrotron port, TRAP is interpreted as a sudden increase of electron cyclotron resonance heating (ECRH) driven convective flux of ripple-trapped suprathermal electrons. This effect occurs in most of the magnetic configurations explored to date and is strongly affected by the presence of low order rational surfaces. A first assessment of the implications of TRAPs for confinement in ECRH plasmas of the TJ-II device is presented.

日本語訳

TJ-IIステラレータにおいて、プラズマ周辺部の放射率に間欠的なトロイダル非対称性が検出された。トロイダル放射非対称位相(TRAP)の間、電子サイクロトロン放射および全放射において急峻な増減ジャンプが観測される。時間分解軟X線スペクトルもまた、超熱電子集団の変化を示す。非対称性がジャイロトロンポート近傍の壁脱離の変動を明らかにすることを考慮すると、TRAPは電子サイクロトロン共鳴加熱(ECRH)によって駆動されるリップル捕捉超熱電子の対流フラックスの急激な増加として解釈される。この効果は、これまでに探査されたほとんどの磁気配位において発生し、低次の有理面の存在によって強く影響を受ける。TJ-II装置のECRHプラズマにおける閉じ込めに対するTRAPの影響の最初の評価が提示される。

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tj-ii高精度(タイトル一致)

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StellaratorElectron cyclotron heatingTJ-II
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