We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Spectra of Enhanced Scattering by Spontaneous Density Fluctuations in a Tokamak.
- Authors
Gurchenko, A. D.; Gusakov, E. Z.; Larionov, M. M.; Novik, K. M.; Savel'ev, A. N.; Selenin, V. L.; Stepanov, A. Yu.
- Abstract
The wavenumber-resolved radar backscattering diagnostics in the upper hybrid resonance (UHR) region was used to study low-frequency short-scale turbulence in the FT-1 tokamak. The scattered spectra were measured for different delay times of the scattered signals. It is shown that the width of the spectrum of enhanced scattering by spontaneous fluctuations is proportional to the delay time. Possible mechanisms for the formation of the scattered spectra are proposed and discussed. The results of simulations and additional experiments were used to determine the dominant mechanisms governing the formation of the scattered spectra in the FT-1 tokamak. These mechanisms are related to the effect of multiple small-angle scattering of both the probing wave and the waves backscattered in the UHR region by long-scale density fluctuations and to the Doppler effect caused by the entrainment of short-scale fluctuations by the long-scale turbulent flow. © 2004 MAIK “Nauka / Interperiodica”.
- Subjects
TOKAMAKS; PINCH effect (Physics); FUSION reactors; TRAPPED-particle instabilities; SPECTRUM analysis; SCATTERING (Physics)
- Publication
Plasma Physics Reports, 2004, Vol 30, Issue 10, p807
- ISSN
1063-780X
- Publication type
Article
- DOI
10.1134/1.1809400