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首页> 外文期刊>Nuclear fusion >Simulation of density fluctuations before the L-H transition for Hydrogen and Deuterium plasmas in the DIII-D tokamak using the BOUT ++ code
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Simulation of density fluctuations before the L-H transition for Hydrogen and Deuterium plasmas in the DIII-D tokamak using the BOUT ++ code

机译：使用BOUT ++代码模拟DIII-D托卡马克中氢和氘原子的L-H跃迁之前的密度波动

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摘要

A six-field two-fluid model has been used to simulate density fluctuations. The equilibrium is generated by experimental measurements for both Deuterium (D) and Hydrogen (H) plasmas at the lowest densities of DIII-D low to high confinement (L-H) transition experiments. In linear simulations, the unstable modes are found to be resistive ballooning modes with the most unstable mode number n = 30 or k_θ ρ_i ～ 0.12. The ion diamagnetic drift and E × B convection flow are balanced when the radial electric field (E_r) is calculated from the pressure profile without net flow. The curvature drift plays an important role in this stage. Two poloidally counter propagating modes are found in the nonlinear simulation of the D plasma at electron density n_e, ～ 1.5 × 10~(19) m~(-3) near the separatrix while a single ion mode is found in the H plasma at the similar lower density, which are consistent with the experimental results measured by the beam emission spectroscopy (BES) diagnostic on the DIII-D tokamak. The frequency of the electron modes and the ion modes are about 40kHz and 10 kHz respectively. The poloidal wave number k_θ is about 0.2 cm~(-1) (k_θ ρ_i ～ 0.05) for both ion and electron modes. The particle flux, ion and electron heat fluxes are ～3.5-6 times larger for the H plasma than the D plasma, which makes it harder to achieve H-mode for the same heating power. The change of the atomic mass number A from 2 to 1 using D plasma equilibrium make little difference on the flux. Increase the electric field will suppress the density fluctuation. The electric field scan and ion mass scan results show that the dual-mode results primarily from differences in the profiles rather than the ion mass.
机译：六场两流体模型已用于模拟密度波动。通过在最低密度的DIII-D低至高限制（L-H）过渡实验中对氘（D）和氢（H）等离子体进行实验测量来生成平衡。在线性模拟中，发现不稳定模式是电阻膨胀模式，其最大不稳定模式编号为n = 30或k_θρ_i〜0.12。当根据无净流量的压力曲线计算径向电场（E_r）时，离子反磁漂移和E×B对流是平衡的。在此阶段，曲率漂移起着重要作用。在D等离子体的非线性模拟中，在分离线附近的电子密度为n_e，〜1.5×10〜（19）m〜（-3）时，发现了两个极向传播模式;类似的较低密度，这与通过DIII-D托卡马克诊断仪的束发射光谱（BES）测量的实验结果一致。电子模式和离子模式的频率分别约为40kHz和10kHz。对于离子模式和电子模式，极向波数k_θ均为约0.2 cm〜（-1）（k_θρ_i〜0.05）。 H等离子体的粒子通量，离子和电子热通量是D等离子体的〜3.5-6倍，这使得在相同的加热功率下很难实现H模式。使用D等离子体平衡将原子质量数A从2更改为1，对通量的影响很小。增加电场会抑制密度波动。电场扫描和离子质量扫描结果表明，双模式结果主要是由轮廓差异而不是离子质量引起的。

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  • 来源
    《Nuclear fusion》 |2018年第2期|026026.1-026026.13|共13页
  • 作者

    Y.M. Wang; X.Q. Xu; Z. Yan; G.R. Mckee; B.A. Grierson; T.Y. Xia; X. Gao;

  • 作者单位

    Institute of Plasmas Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China,Lawrence Livermore National Laboratory, Livermore, CA 94550, United States of America;

    Lawrence Livermore National Laboratory, Livermore, CA 94550, United States of America;

    University of Wisconsin-Madison, Madison, WI 53706, United States of America;

    University of Wisconsin-Madison, Madison, WI 53706, United States of America;

    Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, United States of America;

    Institute of Plasmas Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasmas Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of 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

    isotopic effects; L-H transition; radial electric field; DIII-D; BOUT++;

    机译：同位素效应L-H过渡;径向电场DIII-D;BOUT ++;

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