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首页> 外文期刊>Nuclear fusion >Sub-microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission
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Sub-microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission

机译：从离子回旋加速器发射推断出的KSTAR托卡马克等离子体中边缘局限模式期间边缘密度的亚微秒时间演变

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摘要

During edge localised mode (ELM) crashes in KSTAR deuterium plasmas, bursts of spectrally structured ion cyclotron emission (ICE) are detected. Usually the ICE spectrum chirps downwards during an ELM crash, on sub-microsecond timescales. For KSTAR ICE where the separation of spectral peak frequencies is close to the proton cyclotron frequency Ω_(cp) at the outer plasma edge, we show that the driving population of energetic ions is likely to be a subset of the 3 MeV fusion protons, born centrally on deeply passing orbits which drift from the core to the edge plasma. We report first principles modelling of this scenario using a particle-in-cell code, which evolves the full orbit dynamics of large numbers of energetic protons, thermal deuterons, and electrons self-consistently with the electric and magnetic fields. The Fourier transform of the excited fields in the nonlinear saturated regime of the simulations is the theoretical counterpart to the measured ICE spectra. Multiple simulation runs for different, adjacent, values of the plasma density under KSTAR edge conditions enable us to infer the theoretical dependence of ICE spectral structure on the local electron number density. By matching this density dependence to the observed time-dependence of chirping ICE spectra in KSTAR, we obtain sub-microsecond time resolution of the evolving local electron number density during the ELM crash.
机译：在KSTAR氘等离子体的边缘局部模式（ELM）崩溃期间，检测到光谱结构的离子回旋加速器发射（ICE）的脉冲。通常，在ELM崩溃期间，ICE频谱会在亚微秒级的时间内向下chi。对于KSTAR ICE，其光谱峰值频率的分离接近外部等离子体边缘的质子回旋加速器频率（_（cp），我们表明高能离子的驱动种群很可能是3 MeV聚变质子的子集从核心到边缘等离子的深处通过轨道的中心。我们报告了使用单元格内粒子代码对该场景进行的首要原理建模，该代码可与电场和磁场自洽地演化出大量高能质子，热氘核和电子的全轨道动力学。在模拟的非线性饱和状态下，激发场的傅立叶变换与所测ICE谱的理论对应。在KSTAR边缘条件下对不同，相邻的等离子体密度值进行多次模拟，使我们能够推断ICE光谱结构对局部电子数密度的理论依赖性。通过将这种密度依赖性与在KSTAR中观测到的of ICE光谱的时间依赖性相匹配，我们获得了ELM碰撞过程中演化的局部电子数密度的亚微秒时间分辨率。

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  • 来源
    《Nuclear fusion》 |2017年第12期|18-26|共9页
  • 作者

    B. Chapman; R.O. Dendy; K.G. McClements; S.C. Chapman; G.S. Yun; S.G. Thatipamula; M.H. Kim;

  • 作者单位

    Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7 AL, United Kingdom;

    Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7 AL, United Kingdom,CCFE, Culham Science Centre, Abingdon, OX14 3DB, United Kingdom;

    CCFE, Culham Science Centre, Abingdon, OX14 3DB, United Kingdom;

    Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7 AL, United Kingdom;

    Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea;

    Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea;

    Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea;

  • 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

    ELM; ion cyclotron emission; the magnetoacoustic cyclotron instability; tokamak; numerical simulation; particle in cell; KSTAR;

    机译：榆树;离子回旋加速器发射;磁声回旋加速器的不稳定性;托卡马克数值模拟细胞中的颗粒科士达;

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