[仿真]Simulation of optical and synthetic imaging using microwave reflectometry

Abstract r)Mx.`d!  
Two-dimensional full-wave time-dependent simulations in full plasma >> 8KL`l  
geometry are presented, which show that conventional reflectometry (without a b$$L]$q2  
lens) can be used to synthetically image density fluctuations in fusion plasmas j)lM:vXR  
under conditions where the parallel correlation length greatly exceeds the 9O0  
poloidal correlation length of the turbulence. The advantage of synthetic 0I ND9h.%  
imaging is that the image can be produced without the need for a large lens of BR0p0%  
high optical quality, and each frequency that is launched can be independently %]= 'Uv^x  
imaged. A particularly simple arrangement, consisting of a single receiver O<H@:W#k  
located at the midpoint of a microwave beam propagating along the plasma L}sm R,  
midplane is shown to suffice for imaging purposes. However, as the ratio of the ]aMa*fF  
parallel to poloidal correlation length decreases, a poloidal array of receivers
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needs to be used to synthesize the image with high accuracy. Simulations using A?{aUQB~|  
.. lG^mW\O  
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