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H-mode pedestal improvements with neon injection in DIII-D

机译：在DIII-D中通过霓虹灯注入改进H型基座

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摘要

Improvements in the H-mode pedestal pressure and global energy confinement were observed on DIII-D with both 3 and 6 MW of neutral beam (NBI) heating with neon injection. The pedestal pressure increased, primarily associated with a significant increase in the pedestal density with a relatively smaller decrease in the pedestal temperature. At the same neon injection rate, a rapid decrease in edge localized mode (ELM) frequency and ～35% increase in plasma stored energy were observed in the 3 MW discharge, while in the 6 MW discharge, the ELM frequency was gradually decreased and the plasma stored energy gradually increased by up to 20%. The measured pedestal widths from both 3 and 6 MW discharges matched the EPED1.0 width scaling, △_(ψN) = 0.089β~(1/2)_(p, ped), within 20% deviations before and after neon injection. The peeling-ballooning mode (PBM) stability analysis showed that after neon injection, the ballooning stability boundary was increased, while the peeling stability boundary only dropped once the neon level was relatively high. The ballooning stability boundary increase with neon injection is consistent with increase of the ion diamagnetic stabilization (i.e. including the contribution from carbon, neon as well as deuterium ions) which is used in the criterion to determine when the calculated linear growth rates of PBM are unstable. Consequently, the new ELITE computed PBM boundaries were more consistent with the operating points than when only deuterium was included. This in turn indicates that the impurity may help to improve pedestal pressure through affecting ion diamagnetic frequency in the pedestal region, which could positively lead to the ballooning stability boundary extension.
机译：在DIII-D上，通过3兆瓦和6兆瓦的中性束（NBI）加热并注入氖气，在DIII-D上观察到了H模式基座压力和整体能量限制的改善。基座压力增加，主要与基座密度的显着增加相关，而基座温度的下降相对较小。在相同的氖注入速率下，在3 MW放电中观察到边缘局部模式（ELM）频率快速下降，并且血浆存储能量增加了〜35％，而在6 MW放电中，ELM频率逐渐降低，并且血浆存储的能量逐渐增加了20％。在3兆瓦和6兆瓦的放电中测得的基座宽度与EPED1.0的宽度标度△_（ψN）=0.089β〜（1/2）_（p，ped）相匹配，在霓虹灯注入前后都存在20％的偏差。剥离-膨胀模式（PBM）稳定性分析表明，在注入氖气后，膨胀稳定性边界增加，而剥离强度边界仅在氖含量相对较高时下降。随着氖气注入的膨胀稳定性边界的增加与离子抗磁稳定作用的增加（即包括碳，氖气和氘离子的贡献）相一致，离子抗磁稳定度被用于确定所计算的PBM线性增长率何时不稳定的标准。因此，与仅包括氘的情况相比，新的ELITE计算的PBM边界与工作点更加一致。这又表明杂质可能会通过影响基座区域中的离子抗磁频率来帮助改善基座压力，这可能会导致气球膨胀边界扩展。

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  • 来源
    《Nuclear fusion》 |2020年第5期|056013.1-056013.22|共22页
  • 作者

    H. Lan; T.H. Osborne; R.J. Groebner; P.B. Snyder; G.S. Xu; B.A. Grierson; B.S. Victor; A.W. Leonard; H.Q. Wang;

  • 作者单位

    Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China University of Chinese Academy of Sciences Beijing 100049 China;

    General Atomics 85608 San Diego CA 92186-5608 United States of America;

    Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China;

    Princeton Plasma Physics Laboratory 451 Princeton NJ 08543 United States of America;

    Lawrence Livermore National Laboratory Livermore CA 94550 United States of America;

  • 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
  • 中图分类
  • 关键词

    DIII-D; pedestal; H-mode; neon;

    机译：DIII-D;座;H模式氖;

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