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- W1508154188 abstract "It has been suggested for some time that microwave reflectometry, has the potential for measuring the large scale structure of density fluctuations in tokamak turbulence with greatly improved spatial resolution over existing scattering techniques. The motivation for developing fluctuation diagnostics with improved spatial resolution of large scale structures is that such fluctuations may potentially account for the anomalous particle and energy transport observed in tokamaks. On TFTR we now have operational a four channel X-mode reflectometer system comprising of three fixed frequency channels at 140, 132.5, and 125 GHz and a able frequency channel scanning between 110--123 GHz. Each channel detects fluctuations from a region on the equatorial plane of the plasma torus with spatial resolution of [approx]5 cm in the poloidal direction and [approx]1 cm in the radial direction. Properties of the plasma turbulence are inferred from the amplitude and spectral coherence of phase fluctuations impressed on the reflected wave by density irregularities at or near the cutoff. Experimental results are presented which show the existence of previously unobserved large scale (k[perpendicular][rho][sub i]<<1) random and coherent density fluctuations in the Ohmic and Supershot regimes of TFTR." @default.
- W1508154188 created "2016-06-24" @default.
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- W1508154188 date "1993-03-01" @default.
- W1508154188 modified "2023-09-24" @default.
- W1508154188 title "The application of X-mode reflectometry to the study of large scale fluctuations in TFTR" @default.
- W1508154188 hasPublicationYear "1993" @default.
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