| Issue |
EPJ Web Conf.
Volume 203, 2019
20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC20)
|
|
|---|---|---|
| Article Number | 01011 | |
| Number of page(s) | 4 | |
| Section | Theory | |
| DOI | https://doi.org/10.1051/epjconf/201920301011 | |
| Published online | 25 March 2019 | |
https://doi.org/10.1051/epjconf/201920301011
Numerical description of mode coupled waves in inhomogeneous magnetized plasmas
1
Nagoya University Nagoya, Aichi, Japan
2
National Institute for Fusion ScienceToki, Gifu Japan
* e-mail: yanagihara.kohta@nifs.ac.jp
** e-mail: kubo.shin@nifs.ac.jp
Published online: 25 March 2019
Geometrical optics (GO) ray tracing has been widely used for a description of electron cyclotron resonance waves in inhomogeneous magnetized fusion plasmas. However, this reduced approach is not correct in sufficient low density plasmas with a sheared magnetic field, where mode coupling between two electromagnetic-like cold plasma modes can occur. Here, we extend a ray tracing method based on the first-order theory of extended geometrical optics (XGO), which captures mode coupled complex amplitude between O and X mode along the ray trajectory. In our approach, reference ray is calculated with ray equation to satisfy the lowest-order part of XGO theory and an evolution of complex amplitude profile along the reference ray is calculated with partial differential equation derived from first-order terms. Calculation results performed by extended ray tracing are in good agreement with 1D full wave analysis. By introducing second-order terms into our numerical approach, diffraction will be treated.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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