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Characterization of cold background plasma during the runaway electron beam mitigation experiments in the JET tokamak

机译:射流托卡马克失控电子束缓解实验期间冷背景等离子体的特征

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摘要

Disruptions are a major threat to future tokamaks including ITER. They generate excessive electromagnetic forces, heat loads and multi-MeV runaway electrons. The runaway electron beam carries the risk of in-vessel component damage and even the structures beyond them. Thus, prevention of the runaway beam generation or the mitigation of the developed beam is of prime importance. In JET ITER-like wall, the runaway electron beams triggered by massive gas injection (MGI) coexists with a cold background plasma. Lines corresponding to the higher ionization states of argon are observed in VUV spectra outside of the runaway region suggesting a hot background plasma.Using the quantitative analysis of the VUV spectroscopy, the temperature profiles of the background plasmas are estimated using a synthetic line ratios method. The background plasmas at JET-ILW are found to be hotter than other tokamaks where mitigation of the runaway electron beam was unconditionally successful. The volume-averaged T_e is found to increase linearly with the gas amount used to trigger the disruption and the electron density in the far scrape-off layer. It is independent of other background plasma properties. A 0D/1D power balance of the post-disruption physical systems is made using the characteristics of the background plasma. The collisional power loss of the runaway electron beam is the primary power source heating the background plasma.
机译:中断是对包括ITER在内的未来Tokamak的主要威胁。它们产生过大的电磁力,热负荷和多MEV失控电子。失控电子束带有容器组件损坏的风险,甚至超出它们的结构。因此,防止失控光束产生或发达光束的减轻是主要的重要性。在喷射浸泡壁中,通过具有冷背景等离子体的大规模气体喷射(Mgi)共存的逆转电子束。对应于氩气的较高电离状态的线在逆向区域之外的VUV光谱中观察到,暗示热背景等离子体的定量分析,使用合成线比例估计背景等离子体的温度轮廓。喷射器ILW的背景等离子体被发现比其他托卡马克更热,其中失控电子束的减轻无条件成功。发现体积平均T_E与用于触发远刮除层中的中断和电子密度的气体量线性增加。它独立于其他背景等离子体特性。使用背景等离子体的特性进行后破坏性物理系统的0d / 1d功率平衡。失控电子束的碰撞功率损耗是加热背景等离子体的主要电源。

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  • 来源
    《Nuclear fusion》 |2020年第9期|096010.1-096010.21|共21页
  • 作者单位

    CEA IRFM F-13108 Saint-Paul-lez-Durance France Aix-Marseille University CNRS PIIM UMR 7345 13397- Marseille France;

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

    Aix-Marseille University CNRS PIIM UMR 7345 13397- Marseille France;

    ITER Organization Route de Vinon sur Verdon 13115 St Paul Lez Durance France;

    Department of Mathematics and Physics Queen's University Belfast Belfast BT71NN United Kingdom of Great Britain and Northern Ireland CCFE Culham Science Centre Abingdon OX14 3DB United Kingdom of Great Britain and Northern Ireland;

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

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

  • 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

    runaway electrons; tokamak; JET; disruption mitigation; massive gas injection; runaway companion plasma;

    机译:失控电子;Tokamak;喷射;中断缓解;巨大的气体注入;失控的伴侣等离子体;

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