Investigation of Dual Polarization Reflectometry for Determination of Plasma Density and Magnetic Field in a Spherical Tokamak

Grekov, D. L.; Tretiak, Krasymyr

doi:10.1007/s10894-016-0114-x

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“…The microwave methods which include no contact and at the absence of temperature limitations are good for diagnostics of dense and hot plasmas [8,9]. To diagnose dense plasma (N e  10 12 -10 14 cm -3 ), methods of microwave plasma refl ectometry (including correlation, correlation poloidal, and Doppler refl ectometry) are widely used [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Using microwave refraction to determine local inhomogeneities of a rotating plasma

2023

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To determine the local inhomogeneities of a rotating plasma, the method based on microwave refraction was used. The method is based on spectral and correlation analysis of the reflected signals from the rotating plasma layer at normal and inclined microwave incidence. This method allowed us to determine local inhomogeneities of plasma electron density, angles of azimuthal displacement of grooves, and its angular frequency of rotation. Using an additional 4th horn antenna, in contrast to previous works, it was possible to find and analyze two regions with azimuthal inhomogeneities in the rotating plasma. Analysis of the reflected signals shows the presence of four grooves, and the angular frequency of rotation ω = 1.16 × 104 rad/s was also determined.

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