期刊
PLASMA PHYSICS AND CONTROLLED FUSION
卷 59, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6587/aa6fe7
关键词
electromagnetic scattering by plasma media; electromagnetic propagation in plasma media; finite difference methods; microwave reflectometry; simulation; plasma diagnostics; plasma turbulence
资金
- Ministry of Science, Research and Arts
- Universities of the State of Baden-Wurttemberg, Germany within the framework programme bwHPC
The perpendicular density fluctuation spectrum in the tokamak ASDEX Upgrade was measured with Doppler reflectometry. In this paper, extensive plasma turbulence and microwave propagation simulations with the GENE gyro-kinetic code and the IPF-FD3D full-wave code were undertaken to explain the observed spectral shape. It was shown that in this case the X-mode polarisation suffers both from a large nonlinear saturation effect at low-to-intermediate probed wavenumbers, and a super-linear enhancement effect at large wavenumbers. With these effects, we were able to explain the observed discrepancies between the GENE perpendicular wavenumber spectra and the Doppler reflectometry derived wavenumber spectra. While the agreement is not perfect, the simulations give guidance on how to interpret X-mode Doppler reflectometry spectra.
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