Nonlinear Doppler reflectometry power response. Analytical predictions and full-wave modelling

Analytical theory of Doppler reflectometry in slab plasma model

Doppler reflectometry is considered in slab plasma model in the frameworks of analytical theory. The diagnostics locality is analyzed for both regimes: linear and nonlinear in turbulence amplitude. The toroidal antenna focusing of probing beam to the cutoff is proposed and discussed as a method to increase diagnostics spatial resolution. It is shown that even in the case of nonlinear regime of ...

Spatial and Wavenumber Resolution of Doppler Reflectometry

Full Wave Modelling of Light Propagation and Reflection

The propagation and reflection of electromagnetic waves in a three-dimensional environment is simulated, and realistic images are produced using the resulting light distributions and reflectance functions. A finite difference time domain method is employed to advance the electric and magnetic fields in a scene. Surfaces containing wavelength scaled structures are created, the interaction of the...

Two-dimensional full wave simulation of microwave reflectometry on Alcator C-Mod

A new 2-D full-wave code has been developed to simulate ordinary (O) mode reflectometry signals caused by plasma density fluctuations. The code uses the finite-difference time-domain method with a perfectly-matched-layer absorption boundary to solve Maxwell’s equations. Huygens wave sources are incorporated to generate Gaussian beams. The code has been used to simulate the reflectometer measure...

Rogue waves: Analytical predictions

Rogue waves observed in the ocean and elsewhere are often modelled by certain solutions of the nonlinear Schrodinger equation, describing the modulational instability of a plane wave and the subsequent development of multi-phase nonlinear wavetrains. In this paper, we describe how integrability and application of the inverse scattering transform can be used to construct a class of explicit asym...