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

O. L. Krutkin, A. B. Altukhov, A. D. Gurchenko, E. Z. Gusakov, S. Heuraux, M. A. Irzak, L. A. Esipov, T. P. Kiviniemi, C. Lechte, S. Leerink, P. Niskala, G. Zadvitskiy

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
Article number064001
JournalPlasma Science and Technology
Volume22
Issue number6
DOIs
Publication statusPublished - 5 Mar 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • full-wave modeling
  • numerical modeling
  • reflectometry

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  • Projects

    Turbulent transport of fusion plasmas

    Kiviniemi, T.

    01/02/202031/12/2021

    Project: Academy of Finland: Other research funding

    Cyclokinetic edge turbulence in tokamak plasmas

    Kiviniemi, T., Chone, L. & Iorio, R.

    01/09/201831/12/2022

    Project: Academy of Finland: Other research funding

    Cite this

    Krutkin, O. L., Altukhov, A. B., Gurchenko, A. D., Gusakov, E. Z., Heuraux, S., Irzak, M. A., ... Zadvitskiy, G. (2020). Investigation of nonlinear effects in Doppler reflectometry using full-wave synthetic diagnostics. Plasma Science and Technology, 22(6), [064001]. https://doi.org/10.1088/2058-6272/ab5c28