Abstract
Full-wave simulations are performed in order to investigate the interaction of plasma density per- turbations and microwaves. The perturbations are divided into two cases: A single blob-like structure and a fully turbulent density profile. The resulting scattering of a microwave beam and the effect on the O-X mode conversion are presented for both cases. Quantitative analyses are performed as a function of the average size and position of the perturbations. The usage of spatial coordinates normalized to the vacuum wavelength of the microwave allows to easily adopt the results to a specific problem.
Highlights
Electromagnetic waves in the microwave regime are commonly used to both heat plasmas and diagnose them
The EBWs can be coupled to electromagnetic waves at the plasma boundary
Subsequent coupling to electromagnetic waves at the plasma boundary and detection of these waves allows them to be used as a diagnostics
Summary
Electromagnetic waves in the microwave regime are commonly used to both heat plasmas and diagnose them. The EBWs can be coupled to electromagnetic waves at the plasma boundary. Strong gradients at the plasma boundary can drive turbulence, which leads to perturbations in the plasma density. These perturbations can significantly distort a traversing microwave beam. Since the O–X mode conversion layer is usually located at the plasma boundary, the perturbations can result in a severe reduction of the coupling efficiency of the O-mode to the X-mode and, to the EBW. Full-wave simulations are performed to investigate and quantify the influence of density perturbations on this coupling process and on traversing microwaves in general. The scattering process of microwaves at the blob-like perturbations is, in addition, analyzed with the 3D full-wave code EMIT-3D [5]. Excellent agreement is found for geometries, which are basically two dimensional in nature
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