Measurement of the tilt angle of turbulent structures in magnetically confined plasmas using Doppler reflectometry | Zendy

J. R. Pinzón | Zendy; T. Estrada | Zendy; T. Happel | Zendy; P. Hennequin | Zendy; E. Blanco | Zendy; U. Stroth | Zendy

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Measurement of the tilt angle of turbulent structures in magnetically confined plasmas using Doppler reflectometry

Author(s) -

J. R. Pinzón,

T. Estrada,

T. Happel,

P. Hennequin,

E. Blanco,

U. Stroth

Publication year - 2019

Publication title -

plasma physics and controlled fusion

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.328

H-Index - 111

eISSN - 1361-6587

pISSN - 0741-3335

DOI - 10.1088/1361-6587/ab394d

Subject(s) - tilt (camera) , stellarator , turbulence , tokamak , plasma , asdex upgrade , reflectometry , doppler effect , physics , anisotropy , computational physics , core (optical fiber) , optics , mechanics , nuclear physics , time domain , computer science , computer vision , mechanical engineering , engineering , astronomy

The mean tilt angle of turbulent structures is a key element for describing the turbulence and its interplay with plasma flows in magnetically confined plasmas. It is a quantity predicted by theories and gyrokinetic simulations, which can provide information on the type of the dominant micro-instability, and also on the turbulence anisotropy induced by sheared flows. A new method for measuring the tilt angle of turbulent structures using Doppler reflectometry has been recently introduced (Pinzón et al 2019 Nucl. Fusion 59 074002). It is based on the time delay of the cross-correlation between microwaves backscattered at radially displaced positions. In this paper, the method is presented in detail and is successfully applied on the ASDEX Upgrade tokamak and the TJ-II stellarator. Measurements of the tilt angle in the core of both machines are reported, in the TJ-II case, for the first time.

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