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

Plasma science and Technology 2020年第6期22卷 1-7页

作者： 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 Ioffe Institute St PetersburgRussia Institut Jean Lamour UMR 7198 CNRs Univ.de LorraineBP 50840F-54011 NancyFrance Aalto University FI-02150 EspooFinland Institute of Interfacial Process Eng.and Plasma Technology D-70569 StuttgartGermany

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 *** of the RCDR correlation function and widening of the DR poloidal wavenumber spectrum are *** effect on the dependence of the DR signal frequency shift on the probing wavenumber is found,namely,this dependence‘linearizing’in the nonlinear scattering *** 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.

关键词： reflectometry numerical modeling full-wave modeling

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Reconstruction of hollow areas in density profiles from frequency swept reflectometry

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Plasma science and Technology 2020年第6期22卷 32-40页

作者： Rennan B MORALEs stéphane heuraux Roland sABOT sébastien HACQUIN Frédéric CLAIRET the Tore supra Team United Kingdom Atomic Energy Authority Culham Centre for Fusion EnergyCulham Science CentreAbingdonOxonOX143DBUnited Kingdom IJL UMR CNRSUniversity of LorraineBP50840NancyF-54011France Institute of Physics University of Sao PauloSao Paulo 05315-970Brazil IRFM CEACadaracheF-13108 Saint-Paul-lez-DuranceFrance EUROfusion Programme Management Unit Culham Science CentreCulham OX143DBUnited Kingdom

The standard density profile reconstruction techniques are based on the WKB approximation of the probing wave’s phase,making them unable to properly reconstruct blind areas in the cut-off frequency *** reconstruction suffers a significant immediate error that is not rapidly *** is demonstrated that even though no reflections occur inside the hollow region causing the blind area,the higher probing frequencies that propagate through it carry information that can be used to estimate its *** usually ignored full-wave effects were investigated with the use of full-wave simulations in 1 D,with special attention paid to the frequency band where they are dominant.A database of perturbation signals was simulated onfive-dimensions of parameters and an application of the database inversion was demonstrated for a magnetic island in a Tore supra *** new adapted reconstruction scheme improved the description of the density profile inside the hollow region and also along 10 cm after it.

关键词： FM-CW reflectometry profile reconstruction reflectometry density profile hollow profile blind area

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维普期刊数据库

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