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首页> 外文期刊>Plasma physics and controlled fusion >Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D
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Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D

机译：使用GENRAY / CQL3D和TORLH / CQL3D对EAST下混合电流驱动实验进行建模

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The coupled GENRAY-CQL3D code has been used to do systematic ray-tracing and Fokker-Planck analysis for EAST Lower Hybrid wave Current Drive (LHCD) experiments. Despite being in the weak absorption regime, the experimental level of LH current drive is successfully simulated, by taking into account the variations in the parallel wavenumber due to the toroidal effect. The effect of radial transport of the fast LH electrons in EAST has also been studied, which shows that a modest amount of radial transport diffusion can redistribute the fast LH current significantly. Taking advantage of the new capability in GENRAY, the actual Scrape Off Layer (SOL) model with magnetic field, density, temperature, and geometry is included in the simulation for both the lower and the higher density cases, so that the collisional losses of Lower Hybrid Wave (LHW) power in the SOL has been accounted for, which together with fast electron losses can reproduce the LHCD experimental observations in different discharges of EAST. We have also analyzed EAST discharges where there is a significant ohmic contribution to the total current, and good agreement with experiment in terms of total current has been obtained. Also, the full-wave code TORLH has been used for the simulation of the LH physics in the EAST, including full-wave effects such as diffraction and focusing which may also play an important role in bridging the spectral gap. The comparisons between the GENRAY and the TORLH codes are done for both the Maxwellian and the quasi-linear electron Landau damping cases. These simulations represent an important addition to the validation studies of the GENRAY-CQL3D and TORLH models being used in weak absorption scenarios of tokamaks with large aspect ratio.
机译：耦合的GENRAY-CQL3D代码已用于进行系统的射线追踪和Fokker-Planck分析，以进行EAST下部混合波电流驱动（LHCD）实验。尽管处在弱吸收状态，但通过考虑由于环形效应而引起的平行波数变化，可以成功模拟LH电流驱动的实验水平。还研究了快速LH电子在EAST中的径向传输的影响，这表明适度的径向传输扩散可以显着重新分布快速LH电流。利用GENRAY中的新功能，对于较低和较高密度的情况，模拟中都包含具有磁场，密度，温度和几何形状的实际Scrape Off Layer（SOL）模型，因此，Lower的碰撞损失SOL中的混合波（LHW）功率已被考虑在内，它与快速的电子损耗一起可以再现在EAST的不同放电中的LHCD实验观察结果。我们还分析了EAST放电，该放电对总电流有很大的欧姆贡献，并且在总电流方面与实验取得了很好的一致性。同样，全波代码TORLH已被用于模拟EAST中的LH物理，包括诸如衍射和聚焦之类的全波效应，它们也可能在弥合光谱间隙中起重要作用。对于麦克斯韦和准线性电子朗道阻尼情况，都进行了GENRAY和TORLH码之间的比较。这些模拟代表了对GENRAY-CQL3D和TORLH模型的验证研究的重要补充，该模型用于具有高长宽比的托卡马克的弱吸收场景中。

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