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Magnetic configuration effects on TAE-induced losses and a comparison with the orbit-following model in the Large Helical Device

机译：磁结构对TAE引起的损耗的影响以及与大型螺旋装置中的轨道跟踪模型的比较

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摘要

Fast-ion losses from Large Helical Device (LHD) plasmas due to toroidal Alfven eigenmodes (TAEs) were measured by a scintillator-based lost fast-ion probe (SLIP) to understand the loss processes. TAE-induced losses measured by the SLIP appeared in energy E ranges of around 50-180keV with pitch angles x between 35°-45°, and increased with the increase in TAE amplitudes. Position shifts of the magnetic axis due to a finite plasma pressure led not only to an increase in TAE-induced losses but also to a stronger scaling of fast-ion losses on TAE amplitudes. Characteristics of the observed fast-ion losses were compared with a numerical simulation based on orbit-following models in which the TAE fluctuations are taken into account. The calculation indicated that the number of lost fast ions reaching the SLIP increased with the increase in the TAE amplitude at the TAE gap. Moreover, the calculated dependence of fast-ion loss fluxes on the fluctuation amplitude became stronger in the case of large magnetic axis shifts, compared with the case of smaller shifts, as was observed in the experiments. The simulation results agreed qualitatively with the experimental observations in the LHD.
机译：通过基于闪烁器的丢失快速离子探针（SLIP）测量了由于环形Alfven本征模式（TAE）而导致的大型螺旋设备（LHD）等离子体的快速离子损失，以了解丢失过程。通过SLIP测量的TAE诱导的损耗出现在能量E范围为50-180keV的情况下，俯仰角x在35°-45°之间，并且随着TAE幅度的增加而增加。由于有限的等离子体压力而导致的磁轴位置偏移不仅导致TAE引起的损耗增加，而且导致快速离子损耗在TAE振幅上的缩放比例更大。将观测到的快离子损失的特征与基于轨道跟踪模型的数值模拟进行了比较，其中考虑了TAE波动。计算表明，到达SLIP的快速离子损失的数量随着TAE间隙处TAE幅度的增加而增加。此外，实验观察到，与较小的位移相比，在较大的磁轴位移情况下，快速离子损失通量对波动幅度的计算依赖性更强。仿真结果与左手驾驶室的实验观察在质量上吻合。

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  • 来源
    《Nuclear fusion》 |2012年第9期|p.094013.1-094013.12|共12页
  • 作者

    Kunihiro Ogawa; Mitsutaka Isobe; Kazuo Toi; Donald A. Spong; Masaki Osakabe;

  • 作者单位

    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan;

    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan;

    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan;

    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan,Oak Ridge National Laboratory, Oak Ridge, TN 37831-6169, USA;

    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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