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Bursts of electron cyclotron emission during ELMs and high disruptions in TFTR

A Janos, J Hastie, K McGuire, E Fredrickson1996年Plasma Physics and Controlled FusionIF 2.2出版社

Large ELM events in TFTR are often accompanied by short, intense bursts of electron cyclotron emission. A unique combination of two fast grating polychromator instruments located at different toroidal positions is used to measure the emission and characterize these bursts, which exhibit strong toroidal asymmetries. Bursts are compared to those which occur early in the thermal quench phase of high beta disruptions, the only other time that bursts occur with comparable robustness. In these disruptions, bursts are localized to the vicinity of the ballooning mode, a medium toroidal mode number (n = 10 - 20) precursor, localized toroidally, poloidally, and radially, which triggers the disruption. Rapid loss of particles and sudden rapid cooling occurs. In both cases, bursting can be explained not in terms of excitation of enhanced emission but rather in the reduction of absorption of thermal emission. Bursting is consistent with a modification of the electron distribution function due to a rapid energy or particle exchange between hot electrons and cold electrons from the edge, momentarily reducing the velocity gradient of in the thermal region. This model is qualitatively and quantitatively consistent with experiment, predicting for example emission enhancement factors of .

日本語訳

TFTRにおける大規模ELM事象は、しばしば短時間の強い電子サイクロトロン放射バーストを伴う。異なるトロイダル位置に設置された2つの高速グレーティング分光器の独自の組み合わせを用いて、この放射を測定し、強いトロイダル非対称性を示すこれらのバーストを特徴付ける。バーストは、高ベータ崩壊の熱的クエンチ相の初期に発生するものと比較されるが、これはバーストが同程度の強度で発生する唯一の他の時期である。これらの崩壊において、バーストはバルーニングモードの近傍に局在しており、これは中程度のトロイダルモード数(n = 10 - 20)の前駆現象であり、トロイダル方向、ポロイダル方向、ラジアル方向に局在して崩壊を引き起こす。粒子の急速な損失と急激な冷却が発生する。どちらの場合も、バーストは強化された放射の励起ではなく、熱放射の吸収の低減によって説明できる。バーストは、端部からの高温電子と低温電子の間の急速なエネルギーまたは粒子交換による電子分布関数の変調と一致しており、熱領域におけるの速度勾配を一時的に減少させる。このモデルは実験と定性的かつ定量的に一致しており、例えば放射増強係数がであることを予測している。

装置

tftr高精度(タイトル一致)

wiki

Edge localized modePlasma disruptionElectron cyclotron emissionTFTR
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