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A study on the TAE-induced fast-ion loss process in LHD

机译:TAE诱导的LHD快速离子流失过程的研究

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摘要

Characteristics of fast-ion losses induced by toroidal-Alfven eigenmodes (TAEs) are investigated over wide parameter ranges of Large Helical Device (LHD) plasmas to reveal the fast-ion loss process. To study fast-ion losses, a scintillator-based lost-fast ion probe is used, and an increment of fast-ion loss flux due to TAEs from the neoclassical orbit loss level (△Γ_(fast ion)) is measured. The dependence of △Γ_(fast ion) on the TAE magnetic fluctuation amplitude (b_(θTAE)) changes from a linear to a quadratic and finally a third power with an increase in the magnetic axis shift. It is found, that the dependence of fast-ion loss flux on TAE magnetic fluctuation amplitudes changes at a certain fluctuation level in a fixed configuration. Experimental results show that in the small b_(θTAE) regime, △Γ_(fast ion) is proportional to b_(θTAE) whereas △Γ_(fast ion) increases with the square of b_(θTAE) in the larger b_(θTAE) regime. A simulation by orbit-following codes that incorporate magnetic fluctuations with frequency chirping-down due to TAEs suggests the change in the fast-ion loss process from a convective (△Γ_(fast ion)∝ b_(θTAE)) to a diffusive (△Γ_(fast ion)∝ b_(θTAE)~2) character as b_(θTAE) increases.
机译:在大型螺旋器件(LHD)等离子体的宽参数范围内,研究了由环型Alfven本征模式(TAE)引起的快速离子损失的特性,以揭示快速离子损失过程。为了研究快速离子损失,使用了基于闪烁体的快速丢失离子探针,并测量了新古典轨道损失水平(△Γ_(快速离子))中由于TAE引起的快速离子损失通量的增量。 △Γ_(快离子)对TAE磁波动幅度(b_(θTAE))的依赖性从线性变为二次,最后随着磁轴位移的增加而变三次方。结果发现,在固定配置中,快离子损失通量对TAE磁波动幅度的依赖性在一定的波动水平上发生变化。实验结果表明,在较小的b_(θTAE)态下,△Γ_(快离子)与b_(θTAE)成正比,而在较大的b_(θTAE)态下,△Γ_(快离子)与b_(θTAE)的平方成正比。 。通过跟踪轨道的代码进行模拟,该代码结合了由于TAE导致的频率线性下降和磁波动,从而表明快离子损失过程从对流(△Γ_(快离子)∝ b_(θTAE))变为扩散(△随着b_(θTAE)的增加,Γ_(快离子)∝ b_(θTAE)〜2)字符增加。

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  • 来源
    《Nuclear fusion》 |2013年第5期|12.1-12.6|共6页
  • 作者单位

    National Institute for Fusion Science, Toki 509-5292, Japan;

    National Institute for Fusion Science, Toki 509-5292, Japan;

    National Institute for Fusion Science, Toki 509-5292, Japan;

    National Institute for Fusion Science, Toki 509-5292, Japan;

    Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;

    National Institute for Fusion Science, Toki 509-5292, Japan;

    Institute for Advanced Energy, Kyoto University, Uji 611-0011, 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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