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Multi-scale interaction of pedestal instabilities in H-mode plasma on the EAST tokamak

机译:EAST托卡马克上H型等离子体中基座不稳定性的多尺度相互作用

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摘要

A cross-scale interaction between a kink instability with toroidal mode number (n) of 1 and background microturbulence (mainly a coherent mode with n = 12-17) has been observed in the H-mode edge pedestal region in the EAST tokamak. The n = 1 kink mode with a frequency similar to 3.5 kHz is localized in the pedestal region. The amplitude of pedestal microturbulence is evidently modulated at the frequency of the n = 1 mode. This amplitude modulation is mainly for the fluctuation component with frequency less than 100 kHz, while no modulation by the n = 1 mode is observed for the component with frequency larger than 100kHz. This implies that the observed amplitude modulation by the n = 1 mode is not due to the Doppler shift effect. A further analysis shows that the amplitude modulation of microturbulence could be attributed to modulation of the local temperature gradient by the n = 1 kink mode. In addition, bicoherence analysis indicates that there exists a possible direct nonlinear interaction between background microturbulence and the n = 1 kink instability. A preliminary analysis shows that this cross-scale interaction has no evident effect on the pedestal structure.
机译:在EAST托卡马克的H型边缘基座区域观察到环形模式数(n)为1的纽结不稳定性与背景微湍流(主要为n = 12-17的相干模式)之间的跨尺度相互作用。频率类似于3.5 kHz的n = 1扭结模式位于基座区域中。基座微湍流的幅度显然是在n = 1模式的频率下调制的。此幅度调制主要用于频率小于100 kHz的波动分量,而对于频率大于100 kHz的分量,未观察到n = 1模式的调制。这意味着通过n = 1模式观察到的幅度调制不是由于多普勒频移效应引起的。进一步的分析表明,微湍流的幅度调制可归因于n = 1扭结模式对局部温度梯度的调制。此外,双相干分析表明,背景微湍流与n = 1扭结不稳定性之间可能存在直接的非线性相互作用。初步分析表明,这种跨尺度的交互作用对基座结构没有明显影响。

著录项

  • 来源
    《Nuclear fusion》 |2019年第5期|056020.1-056020.11|共11页
  • 作者单位

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China|Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China|Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China|Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China|Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China|Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China|Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China|Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China;

  • 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

    cross-scale interaction; pedestal instabilities; H-mode;

    机译:跨尺度相互作用;基架不稳定性;H-模式;

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