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Impurity transport experiments and effects on MHD in the National Spherical Torus Experiment (NSTX)

机译:国家球形圆环实验(NSTX)中的杂质迁移实验及其对MHD的影响

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摘要

A first assessment of low-Z impurity transport in beam-heated NSTX H-modes has been performed using magnetic field and current scans at fixed g-profile as well as temperature scans at constant plasma density, current and toroidal field. Impurity diffusivity levels consistent with the neoclassical predictions have been found, whereas a reversal of the convective velocity at low fields indicates an anomalous effect to be at play at the gradient region. Studies on the impact of rotation in low-density H-modes have also shown that heavy and not fully stripped impurities with high Mach numbers can experience core diffusivities several times larger than that of the 'standard' neoclassical transport for stationary plasmas, without the need of invoking the presence of long wavelength core electrostatic turbulence. As a result of a deliberate neon impurity injection we have also observed a correlation between the strength of the emitted radiation, the earlier appearance of tearing modes activity and an enhanced plasma cooling that resulted in enlarged magnetic islands.
机译:使用固定g轮廓的磁场和电流扫描以及恒定等离子体密度,电流和环形场的温度扫描,对束流加热的NSTX H模式下的低Z杂质传输进行了首次评估。已发现与新古典预测相一致的杂质扩散水平,而低场对流速度的逆转表明在梯度区域将发挥异常作用。对低密度H模式下旋转影响的研究还表明,重质且未完全汽提的高马赫数杂质可以经历的核扩散率是固定等离子体的“标准”新古典输运率的几倍。调用长波长纤芯静电湍流。由于故意注入了氖杂质,我们还观察到了所发射的辐射强度,较早出现的撕裂模式活动和增强的等离子体冷却(导致磁岛扩大)之间的相关性。

著录项

  • 来源
    《Nuclear fusion》 |2011年第8期|p.461-472|共12页
  • 作者单位

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

    The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, MD, 21218, USA;

    The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, MD, 21218, USA;

    University of Wisconsin-Madison, Engineering Physics, Madison, WI 53706-1609, USA;

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

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

    The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, MD, 21218, USA;

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

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

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA<英作者单位十一>=Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA<英作者单位十二>=The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, MD, 21218, USA<英作者单位十三>=Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA<英作者单位十四>=Princeton Plasma Physics Laboratory, 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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