G J Kramer et al 2004 Plasma Phys. Control. Fusion 46 695 doi:10.1088/0741-3335/46/4/009
G J Kramer, R Nazikian and E J Valeo
Show affiliationsTwo-dimensional full-wave time-dependent simulations in full plasma geometry are presented, which show that conventional reflectometry (without a lens) can be used to synthetically image density fluctuations in fusion plasmas under conditions where the parallel correlation length greatly exceeds the poloidal correlation length of the turbulence. The advantage of synthetic imaging is that the image can be produced without the need for a large lens of high optical quality, and each frequency that is launched can be independently imaged. A particularly simple arrangement, consisting of a single receiver located at the midpoint of a microwave beam propagating along the plasma midplane is shown to suffice for imaging purposes. However, as the ratio of the parallel to poloidal correlation length decreases, a poloidal array of receivers needs to be used to synthesize the image with high accuracy. Simulations using DIII-D relevant parameters show the similarity of synthetic and optical imaging in present day experiments.
52.70.Gw Radio-frequency and microwave measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Gj Fluctuation and chaos phenomena
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
Issue 4 (April 2004)
Received 19 November 2003
Published 22 March 2004
G J Kramer et al 2004 Plasma Phys. Control. Fusion 46 695
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