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首页> 外文期刊>Plasma physics and controlled fusion >Simulation of the Ohkawa-mechanism-dominated current drive of electron cyclotron waves using linear and quasi-linear models
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Simulation of the Ohkawa-mechanism-dominated current drive of electron cyclotron waves using linear and quasi-linear models

机译：使用线性和准线性模型仿真电子回旋波电流电流驱动

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摘要

Simulation on the Ohkawa-mechanism-dominated current drive (OKCD) of electron cyclotron (EC) waves is performed using TORAY-GA linear code, and the results are compared with those calculated by CQL3D quasi-linear code. It is found that the radial location of the OKCD profile is almost identical between the linear and the quasi-linear calculations. However, there are significant differences in the calculation of the total driven current I-ec and the peak value of the driven current profile j(ec)(peak) between the two models. The I-ec calculated by the CQL3D code is at least 1.4 times larger than the results from the TORAY-GA code. For the calculation of j(ec)(peak), the results from CQL3D are at least 1.6 times larger than that calculated by TORAY-GA. With increasing electron temperature, the two models further enlarge the total driven current scaling factor F-I and the peak driven current density scaling factor F-j. This is mainly because the collision operator in TORAY-GA code adopts a high-speed model and does not retain the first-order Legendre expansion term for momentum conservation of electron self-collision. The quasi-linear effect does not have a significant influence on the total driven current of OKCD when the EC power level does not meet P-rf(MW m(-3)/n(e)(10(19)m(-3)) > 0.5. Therefore, in practical engineering, the TORAY-GA code can be used to calculate OKCD quickly and accurately by multiplying with appropriate scaling factors. The effect of momentum conservation is very important for OKCD and on-axis EC current drive (ECCD), but this effect is not important for off-axis ECCD. The results from this study show that the effects of electron trapping and the collision between resonant passing electrons and trapped electrons are responsible for the decrease in off-axis ECCD efficiency.
机译：利用TORAY-GA线性程序对电子回旋波的Ohkawa机制主导电流驱动（OKCD）进行了模拟，并与CQL3D准线性程序的计算结果进行了比较。研究发现，线性和准线性计算中，OKCD剖面的径向位置几乎相同。然而，两个模型之间的总驱动电流I-ec和驱动电流分布j（ec）（峰值）峰值的计算存在显著差异。CQL3D代码计算的I-ec至少是TORAY-GA代码计算结果的1.4倍。对于j（ec）（峰值）的计算，CQL3D的结果至少是TORAY-GA计算结果的1.6倍。随着电子温度的升高，这两个模型进一步放大了总驱动电流标度因子F-I和峰值驱动电流密度标度因子F-j。这主要是因为TORAY-GA程序中的碰撞算符采用了高速模型，并且没有保留电子自碰撞动量守恒的一阶勒让德展开项。当EC功率水平不满足P-rf（MW m（-3）/n（e）（10（19）m（-3））>0.5时，准线性效应对OKCD的总驱动电流没有显著影响。因此，在实际工程中，通过乘以适当的比例因子，可以使用TORAY-GA代码快速准确地计算OKCD。动量守恒效应对OKCD和轴上电流驱动（ECCD）非常重要，但对离轴电流驱动（ECCD）不重要。研究结果表明，电子俘获效应以及共振通过电子和俘获电子之间的碰撞是导致离轴ECCD效率降低的原因。

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  • 作者

    Zheng P. W.; He L. H.; Yin L.; Lu X. Q.; Huang Q. H.; Zhong Y. J.; Deng S.; Jiang X. C.; Gong X. Y.;

  • 作者单位

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

    Univ South China Demonstrat Base Int Sci &

    Technol Cooperat Nucl E Hengyang 421001 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    current drive; Ohkawa mechanism; EC current drive;

    机译：电流驱动;Ohkawa机制;EC电流驱动器;

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