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L-H transition studies on DIII-D to determine H-mode access for operational scenarios in ITER

机译:对DIII-D进行L-H过渡研究,以确定ITER操作场景中的H模式访问

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摘要

A comprehensive set of L-H transition experiments has been performed on DIII-D to determine the requirements for access to H-mode plasmas in ITER's first (non-nuclear) operational phase with H and He plasmas and the second (activated) operational phase with D plasmas. The H-mode power threshold, P_(th), was evaluated for different operational configurations and auxiliary heating methods for the different main ion species. Helium plasmas have significantly higher P_(th) than deuterium plasmas at low densities for all heating schemes, but similar P_(th) as deuterium plasmas at high densities except for H-neutral beam injection-heated discharges, which are still higher. Changes in P_(th) are observed when helium concentration levels in deuterium plasmas exceed 40%. There is a strong dependence of P_(th) on the magnetic geometry in the vicinity of the divertor. The trend of decreasing P_(th) with decreasing X-point height is observed for all of the main ion species irrespective of the heating method, which appears to indicate that there is a common physics process behind this effect for all of the ion species. Helium and deuterium plasmas exhibit a significant increase in P_(th) for strong resonant magnetic perturbations. The application of a local magnetic ripple of 3% from test blanket module mock-up coils did not change P_(th) in deuterium plasmas.
机译:在DIII-D上进行了一套全面的LH跃迁实验,以确定在ITER的第一个(非核)操作阶段使用H和He等离子体以及在第二个(激活的)操作阶段使用D的H模式等离子体的要求。等离子。针对不同的操作配置和不同的主要离子种类的辅助加热方法,对H模式功率阈值P_(th)进行了评估。在所有加热方案下,氦等离子体的P_(th)都比氘等离子体的密度高得多,但与H离子束注入加热的放电相比,氦离子的P_(th)与高密度的氘等离子体相似。当氘血浆中的氦浓度超过40%时,观察到P_(th)的变化。 P_(th)与偏滤器附近的磁几何形状密切相关。观察到所有主要离子物种的P_(th)随X点高度降低而降低的趋势,而与加热方法无关,这似乎表明,对于所有离子物种而言,这种作用背后都有一个共同的物理过程。对于强共振磁扰动,氦和氘等离子体的P_(th)显着增加。来自测试毯模块模拟线圈的3%的局部磁波纹的施加不会改变氘等离子体中的P_(th)。

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  • 来源
    《Nuclear fusion》 |2011年第10期|p.103020.1-103020.9|共9页
  • 作者单位

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA 94550, USA;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

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

    Forschungszentrum Jiilich, GmbH, IEF4-Plasma Physics, 52428 Jiilich, Germany;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    Oak Ridge National Laboratory, Oak Ridge, TN 37831, 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);
  • 原文格式 PDF
  • 正文语种 eng
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