Investigation of nonlinear effects in Doppler reflectometry using full-wave synthetic diagnostics

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-03-05
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Language
en
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Plasma Science and Technology, Volume 22, issue 6
Abstract
In this work, Doppler reflectometry (DR) and radial correlation DR (RCDR) nonlinear scattering effects are studied using full-wave modeling with a set of representative FT-2 tokamak turbulence as inputs. Narrowing of the RCDR correlation function and widening of the DR poloidal wavenumber spectrum are demonstrated. An effect on the dependence of the DR signal frequency shift on the probing wavenumber is found, namely, this dependence 'linearizing' in the nonlinear scattering regime. Nonlinear effects are shown to be weaker for O-mode probing than for X-mode probing, while a faster transition to nonlinear regime is demonstrated for RCDR compared to DR in both probing scenarios.
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| openaire: EC/H2020/633053/EU//EUROfusion
Keywords
full-wave modeling, numerical modeling, reflectometry
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Krutkin , O L , Altukhov , A B , Gurchenko , A D , Gusakov , E Z , Heuraux , S , Irzak , M A , Esipov , L A , Kiviniemi , T P , Lechte , C , Leerink , S , Niskala , P & Zadvitskiy , G 2020 , ' Investigation of nonlinear effects in Doppler reflectometry using full-wave synthetic diagnostics ' , Plasma Science and Technology , vol. 22 , no. 6 , 064001 . https://doi.org/10.1088/2058-6272/ab5c28