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Control of edge localized modes by pedestal deposited impurity in the HL-2A tokamak

机译：通过HL-2A托卡马克中的基座沉积杂质控制边缘局部模式

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摘要

Effect of the pedestal deposited impurity on the edge-localized mode (ELM) behaviour has been observed and intensively investigated in the HL-2A tokamak. Impurities have been externally seeded by a newly developed laser blow-off (LBO) system. Both mitigation and suppression of ELMs have been realized by LBO-seeded impurity. Measurements have shown that the LBO-seeded impurity particles are mainly deposited in the pedestal region. During the ELM mitigation phase, the pedestal density fluctuation is significantly increased, indicating that the ELM mitigation may be achieved by the enhancement of the pedestal transport. The transition from ELM mitigation to ELM suppression was triggered when the number of the LBO-seeded impurity exceeds a threshold value. During the ELM suppression phase, a harmonic coherent mode (HCM) is excited by the LBO-seeded impurity, and the pedestal density fluctuation is significantly decreased, the electron density is continuously increased, implying that HCM may reduce the pedestal turbulence, suppress ELMs, increase the pedestal pressure, thus extending the Peeling-Ballooning instability limit. It has been found that the occurance of the ELM mitigation and ELM suppression closely depends on the LBO laser spot diameter.
机译：在HL-2A托卡马克中已经观察到并深入研究了基座沉积杂质对边缘定位模式（ELM）行为的影响。杂质已通过新开发的激光吹扫（LBO）系统从外部植入。 LBO注入的杂质已经实现了ELM的缓解和抑制。测量表明，LBO-种的杂质颗粒主要沉积在基座区域中。在ELM缓解阶段，基座密度波动会显着增加，这表明可以通过增强基座运输来实现ELM缓解。当LBO播种杂质的数量超过阈值时，触发从ELM缓解到ELM抑制的转变。在ELM抑制阶段，通过LBO注入的杂质激发谐波相干模式（HCM），并且基座密度波动显着减小，电子密度不断增加，这意味着HCM可以减小基座湍流，抑制ELM，增加基座压力，从而扩展了Peeling-Ballooning不稳定性极限。已经发现，ELM减轻和ELM抑制的发生与LBO激光光斑直径密切相关。

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  • 来源
    《Nuclear fusion》 |2018年第4期|046018.1-046018.13|共13页
  • 作者

    Y.P. Zhang; D. Mazon; X.L. Zou; W.L. Zhong; J.M. Gao; K. Zhang; P. Sun; C.F. Dong; Z.Y. Cui; Yi Liu; Z.B. Shi; D.L Yu; J. Cheng; M. Jiang; J.Q. Xu; M. Isobe; G.L. Xiao; W. Chen; S.D. Song; X.Y. Bai; P.F. Zhang; G.L. Yuan; X.Q. Ji; Y.G. Li; Y. Zhou; L. Delpech; A. Ekedahl; G. Giruzzi; T. Hoang; Y. Peysson; X.M. Song; X.Y. Song; X. Li; X.T. Ding; J.Q. Dong; Q.W. Yang; M. Xu; X.R. Duan; Y. Liu; the HL-2A team;

  • 作者单位

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    National institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5259, Japan,SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China;

    Southwestern Institute of Physics, PO Box 432, Chengdu 610041, 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

    ELM control; impurity; LBO; HL-2A; tokamaks;

    机译：ELM控制;不纯;杠杆收购;HL-2A;托卡马克;

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