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A synthetic diagnostic for the evaluation of new microwave imaging reflectometry diagnostics for DIII-D and KSTARa)
a)Contributed paper, published as part of the Proceedings of the 18th Topical Conference on High-Temperature Plasma Diagnostics, Wildwood, New Jersey, May 2010.
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View: Figures


Image of FIG. 1.
FIG. 1.

A schematic representation of the simulation approach used to evaluate an approach for imaging in MIR systems illustrates the major components and their integration. FWR2D simulation provides an illumination source and simulates the plasma region in three parts: vacuum region, paraxial region, and full-wave region for incident and reflected beams. Optical simulation acts as a receiver by providing a complex amplitude distribution for the E-field of a reciprocal beam generated at the detector with which the output of FWR2D may be convolved. In the above setup, an incident beam is focused at the virtual cutoff, verified by the exact correspondence of incoming and outgoing beams in FWR2D.

Image of FIG. 2.
FIG. 2.

Histogram information for multiple random density fluctuation simulations at differing mean fluctuation amplitude. As fluctuation amplitude is increased, the received signal is strongly distorted by signal amplitude modulation, making interpretation of receiver phase challenging.

Image of FIG. 3.
FIG. 3.

Amplitude distributions for different density fluctuation levels. In this case, at a density fluctuation level of approximately 1%, the distribution begins to converge to a Rayleigh distribution and density fluctuation information is no longer preserved in the received data.

Image of FIG. 4.
FIG. 4.

(a) Amplitude spread vs density fluctuation level and (b) phase spread vs density fluctuation level for six different simulated couplings. In all cases, phase distribution is random when fluctuation levels exceed 1%. (Notations for each case referred to Sec. II, for example, wide focal: wide beam case from FWR2D and focused beam from optical simulation, etc.)


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Scitation: A synthetic diagnostic for the evaluation of new microwave imaging reflectometry diagnostics for DIII-D and KSTARa)