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Fast dynamics of radiofrequency emission in FTU plasmas with runaway electrons

P Buratti, W Bin, A Cardinali, D Carnevale, C Castaldo, O DArcangelo, F Napoli, G L Ravera, A Selce, L Panaccione2021年Plasma Physics and Controlled FusionIF 2.2出版社

Radiofrequency emission in the 0.4–3 GHz range from FTU tokamak in presence of runaway electrons (REs) has been measured in various plasma regimes. Rapid emission bursts associated with enhanced RE pitch-angle scattering reveal kinetic instabilities affecting evolution of the RE population from the buildup phase. Such measurements also provide a sensitive monitor for instabilities during early RE formation. The leading edge of radio bursts is much shorter than interleaving periods of low emission; spectral broadening during growth indicates nonlinear wave coupling as an explanation for the observed intermittency. Both broadband and coherent spectra have been observed. Radio emission disappears at the beginning of post-disruption RE plateaus, and subsequently reappears in the shape of very intense bursts accompanied by macroscopic magnetic perturbations.

日本語訳

0.4–3 GHz帯におけるFTUトカマクからの高周波放射が、逃走電子(RE)の存在下で様々なプラズマ領域において測定された。逃走電子のピッチ角散乱の増大に伴う高速放射バーストは、生成段階からの逃走電子集団の進化に影響を及ぼす運動論的不安定性を明らかにする。このような測定はまた、逃走電子の初期形成時における不安定性の高感度モニターとしても機能する。放射バーストの立ち上がりエッジは、低放射の間欠期間よりもはるかに短く、成長過程におけるスペクトルのブロード化は、観測された間欠性の説明として非線形波動結合を示唆している。ブロードバンドスペクトルとコヒーレントスペクトルの両方が観測された。高周波放射は、ディスラプション後の逃走電子プラトー相の開始時に消失し、その後、巨視的な磁気擾乱を伴う非常に強いバーストの形で再出現する。

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Fusion Advanced Studies TorusRunaway electronFTU
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