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Fast dynamics of radiofrequency emission in plasmas with runaway electrons

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arxiv 2012.11033 v1 pith:5ZX5JOQJ submitted 2020-12-20 physics.plasm-ph

P. Buratti , W. Bin , A. Cardinali , D. Carnevale , C. Castaldo , O. D'Arcangelo , F. Napoli , G.L. Ravera
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A. Selce L. Panaccione A. Romano FTU Team
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classification physics.plasm-ph
keywords emissionburstsradiofrequencyduringelectronsinstabilitiesplasmasrunaway
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Radiofrequency emission in the 0.4 - 3 GHz range from FTU plasmas in presence of runaway electrons (RE) has been measured with unprecedentedly high time resolution. 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. Radiofrequency emission disappears at the beginning of post-disruption RE plateaus, and subsequently reappears in the shape of very intense bursts accompanied by strong rises of suprathermal electron cyclotron emission.

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