Explaining the isotope effect on heat transport in L-mode with the collisional electron-ion energy exchange

P.A. Schneider; A. Bustos; P. Hennequin; F. Ryter; M. Bernert; M. Cavedon; M.G. Dunne; R. Fischer; T. Goerler; T. Happel; V. Igochine; B. Kurzan; A. Lebschy; R.M. McDermott; P. Morel; M. Willensdorfer

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Explaining the isotope effect on heat transport in L-mode with the collisional electron-ion energy exchange

机译：用碰撞电子离子能量交换解释同位素对L型传热的影响

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In ASDEX Upgrade (AUG), the normalised gyroradius ρ_* was varied via a hydrogen isotope scan while keeping other dimensionless parameters constant. This was done in L-mode, to minimise the impact of pedestal stability on confinement. Power balance and perturbative transport analyses reveal that the electron heat transport is unaffected by the differences in isotope mass. Nonlinear simulations with the Gene code suggest that these L-mode discharges are ion temperature gradient (ITG) dominated. The different gyroradii due to the isotope mass do not necessarily result in a change of the predicted heat fluxes. This result is used in simulations with the Astra transport code to match the experimental profiles. In these simulations the experimental profiles and confinement times are reproduced with the same transport coefficients for hydrogen and deuterium plasmas. The mass only enters in the energy exchange term between electrons and ions. These numerical observations are supported by additional experiments which show a lower ion energy confinement compared to that of the electrons. Additionally, hydrogen and deuterium plasmas have a similar confinement when the energy exchange time between electrons and ions is matched. This strongly suggests that the observed isotope dependence in L-mode is not dominated by a gyroradius effect, but a consequence of the mass dependence in the collisional energy exchange between electrons and ions.

机译：在ASDEX升级（AUG）中，归一化的陀螺半径ρ_*通过氢同位素扫描而变化，同时保持其他无量纲参数不变。这是在L模式下完成的，以最大程度地减小基座稳定性对限制的影响。功率平衡和微扰输运分析表明，电子热输运不受同位素质量差异的影响。使用Gene Code进行的非线性模拟表明，这些L模式放电受离子温度梯度（ITG）支配。由于同位素质量不同，回旋半径不一定会导致预测的热通量发生变化。该结果用于带有Astra传输代码的仿真中，以匹配实验曲线。在这些模拟中，使用相同的氢和氘等离子体传输系数来再现实验曲线和限制时间。质量仅进入电子与离子之间的能量交换项。这些数值观测结果得到了其他实验的支持，这些实验显示出与电子相比，离子能量的限制更小。另外，当电子和离子之间的能量交换时间匹配时，氢和氘等离子体具有类似的限制。这有力地表明，在L模式下观察到的同位素依赖性并不由陀螺半径效应决定，而是在电子与离子之间的碰撞能量交换中质量依赖性的结果。

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来源
《Nuclear fusion》 |2017年第6期|066003.1-066003.15|共15页
作者
P.A. Schneider; A. Bustos; P. Hennequin; F. Ryter; M. Bernert; M. Cavedon; M.G. Dunne; R. Fischer; T. Goerler; T. Happel; V. Igochine; B. Kurzan; A. Lebschy; R.M. McDermott; P. Morel; M. Willensdorfer;
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作者单位

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Departamento de Fisica, Universidad Carlos Ⅲ de Madrid, 28911 Leganes, Madrid, Spain;

Laboratoire de Physique des Plasmas, Ecole Polytechnique, France;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

Laboratoire de Physique des Plasmas, Ecole Polytechnique, France;

Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

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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
tokamak; heat transport; isotope; gyrokinetics; confinement;

机译：托卡马克传热同位素;陀螺动力学禁闭;

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Explaining the isotope effect on heat transport in L-mode with the collisional electron-ion energy exchange

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