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Non-linear dynamics of toroidicity-induced Alfven eigenmodes on the National Spherical Torus Experiment

机译:环面诱导Alfven本征模式在国家球形圆环实验中的非线性动力学

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摘要

The National Spherical Torus Experiment (NSTX, (Ono et al 2000 Nucl. Fusion 40 557)) routinely operates with neutral beam injection as the primary system for heating and current drive. The resulting fast ion population is super-Alfvenic, with velocities 1 < v_(fast)/v_(Alfven) < 5. This provides a strong drive for toroidicity-induced Alfven eigenmodes (TAEs). As the discharge evolves, the fast ion population builds up and TAEs exhibit increasing bursts in amplitude and down-chirps in frequency, which eventually lead to a so-called TAE avalanche. Avalanches cause large (<30%) fast ion losses over ~1 ms, as inferred from the neutron rate. The increased fast ion losses correlate with a stronger activity in the TAE band. In addition, it is shown that a n = 1 mode with frequency well below the TAE gap appears in the Fourier spectrum of magnetic fluctuations as a result of non-linear mode coupling between TAEs during avalanche events. The non-linear coupling between modes, which leads to enhanced fast ion transport during avalanches, is investigated.
机译:国家球形圆环实验(NSTX,(Ono et al 2000 Nucl。Fusion 40557))通常以中性束注入作为加热和电流驱动的主要系统。产生的快速离子群是超级Alfvenic的,速度1

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  • 来源
    《Nuclear fusion》 |2011年第6期|p.37.1-37.9|共9页
  • 作者单位

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA;

    University of California, Department of Physics and Astronomy, Los Angeles, CA 90095,USA;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA;

    University of California, Department of Physics and Astronomy, Irvine, CA 92697, USA;

    University of California, Department of Physics and Astronomy, Los Angeles, CA 90095,USA;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA;

    Nova Photonics, Princeton, NJ 08543, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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