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首页> 外文期刊>Plasma physics and controlled fusion >Propagation in 3D of microwaves through density perturbations
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Propagation in 3D of microwaves through density perturbations

机译：通过密度扰动在3D微波中传播

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Simulations using 3D and 2D full-wave codes have shown that edge filaments in tokamak plasmas can significantly affect the propagation of microwaves across a broad frequency spectrum, resulting in scattering angles of up to 46?. Parameter scans were carried out for density perturbations comparable in width and amplitude to MAST filaments and the effect on the measured emission was calculated. 3D effects were discovered in the case of an obliquely incident beam. In general, the problem of electromagnetic propagation past wavelength-sized 3D inhomogeneities is not well understood, yet is of importance for both heating and diagnostic applications in the electron cyclotron frequency range for tokamaks, as well as atmospheric physics. To improve this understanding, a new cold-plasma code, EMIT-3D, was written to extend full-wave microwave simulations in magnetized plasmas to 3D, and make comparisons to the existing 2D code IPF-FDMC. This work supports MAST experiments using the SAMI diagnostic to image microwave emission from the plasma edge due to mode conversion from electron Bernstein waves. Significant fluctuations in the SAMI data mean that detailed modelling is required to improve its interpretation.
机译：使用3D和2D全波代码进行的仿真表明，托卡马克等离子体中的边缘细丝会显着影响微波在宽频谱上的传播，导致散射角高达46°。对宽度和幅度与MAST灯丝相当的密度扰动进行参数扫描，并计算对测得的发射的影响。在倾斜入射光束的情况下发现了3D效果。通常，电磁波传播超过波长大小的3D不均匀性的问题尚未得到很好的理解，但对于托卡马克电子回旋加速器频率范围内的加热和诊断应用以及大气物理学而言，这都是很重要的。为了提高这种理解，编写了一个新的冷等离子体代码EMIT-3D，以将磁化等离子体中的全波微波仿真扩展到3D，并与现有的2D代码IPF-FDMC进行比较。这项工作支持使用SAMI诊断程序进行MAST实验，以对由于电子伯恩斯坦波的模式转换而产生的等离子体边缘的微波发射成像。 SAMI数据的显着波动意味着需要详细的建模来改善其解释。

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