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The 'neutron deficit' in the JET tokamak

机译：JET托卡马克中的“中子赤字”

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摘要

The measured D-D neutron rate of neutral beam heated JET baseline and hybrid H-modes in deuterium is found to be between approximately 50% and 100% of the neutron rate expected from the TRANSP code, depending on the plasma parameters. A number of candidate explanations for the shortfall, such as fuel dilution, errors in beam penetration and effectively available beam power have been excluded. As the neutron rate in JET is dominated by beam-plasma interactions, the 'neutron deficit' may be caused by a yet unidentified form of fast particle redistribution. Modelling, which assumes fast particle transport to be responsible for the deficit, indicates that such redistribution would have to happen at time scales faster than both the slowing down time and the energy confinement time. Sawteeth and edge localised modes are found to make no significant contribution to the deficit. There is also no obvious correlation with magnetohydrodynamic activity measured using magnetic probes at the tokamak vessel walls. Modelling of fast particle orbits in the 3D fields of neoclassical tearing modes shows that realistically sized islands can only contribute a few percent to the deficit. In view of these results it appears unlikely that the neutron deficit results from a single physical process in the plasma.
机译：根据等离子体参数，发现氘中性束加热的JET基线和混合H型的D-D中子速率的测量值约为TRANSP代码所预期中子速率的50％至100％。排除了许多有关短缺的候选解释，例如燃料稀释，光束穿透误差和有效的光束功率。由于JET中的中子速率受束流-等离子体相互作用的支配，因此“中子缺陷”可能是由尚未确定的快速粒子再分布形式引起的。假设快速的粒子传输是造成缺陷的原因，建模表明，这种重新分布必须比减速时间和能量限制时间更快地在时间尺度上发生。发现锯齿和边缘局部化模式对赤字没有显着贡献。在托卡马克的容器壁上用磁性探针测得的磁流体动力活动也没有明显的相关性。对新古典撕裂模式的3D场中的快速粒子轨道进行建模显示，实际大小的岛仅能为赤字贡献百分之几。鉴于这些结果，中子缺陷似乎不可能由等离子体中的单个物理过程引起。

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  • 来源
    《Nuclear fusion》 |2017年第7期|1-11|共11页
  • 作者

    H. Weisen; Hyun-Tae Kim; J. Strachan S. Scott; Y. Baranov; J. Buchanan; M. Fitzgerald; D. Keeling; D.B. King; L. Giacomelli; T. Koskela; M.J. Weisen; C. Giroud; M. Maslov; W.G. Core; K.-D. Zastrow; D.B. Syme; S. Popovichev; S. Conroy; I. Lengar; L. Snoj; P. Batistoni; M. Santala; JET Contributors;

  • 作者单位

    SPC, Ecole Polytechnique Federate de Lausanne, Switzerland;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    PPPL, Princeton University, Princeton, New Jersey, United States of America;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    IFP-CNR, Milano, Italy;

    Aalto University School of Science, Espoo, Finland;

    University of Strathclyde, Glasgow, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Culham Centre for Fusion Energy, Abingdon, United Kingdom;

    Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden;

    Jozef Stefan Institute, Ljubljana, Slovenia;

    Jozef Stefan Institute, Ljubljana, Slovenia;

    ENEA, Via E. Fermi, 45, 00044 Frascati, Rome, Italy;

    Aalto University School of Science, Espoo, Finland;

  • 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

    neutron yield; fusion reactions; Monte Carlo orbit code; TRANSP;

    机译：中子产率聚变反应蒙特卡洛轨道代码;转换;

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