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Communication Dans Un Congrès Année : 2022

Comprehensive experimental turbulence measurements for scale-resolved multichannel gyrokinetic code validation

Résumé

Turbulence is the main driver of heat and particle transport which deteriorates the performance of fusion plasmas. To design turbulence optimised devices, simulation codes need to be validated by experiments. Validation work has already been done for a single or a small number of turbulence observables. A comprehensive set of experimental turbulence data is measured on ASDEX Upgrade for two different plasma scenarios where the electron gradient length is changed by means of ECRH. It includes wavenumber spectra, density and temperature fluctuation amplitudes and radial correlation lengths, the poloidal dependence of the velocity perpendicular to the magnetic field as well as the cross-phase between density and temperature fluctuations. These quantities are measured by Doppler reflectometers in both X-mode and O-mode polarization and an electron cyclotron emission radiometer. They are compared to gyrokinetic turbulence simulations from the GENE code. For this purpose synthetic diagnostic modeling is applied to account for diagnostic effects on measurements. The work shows the encouraging example of code validation where a remarkable number of measured physics quantities is successfully reproduced by the code. We highlight the simultaneous agreement between experiment and simulation of all investigated turbulence quantities. This study provides a sound scientific justification for using codes such as GENE in the design of future fusion reactors.
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Dates et versions

hal-04417960 , version 1 (29-01-2024)

Identifiants

  • HAL Id : hal-04417960 , version 1

Citer

K. Höfler, T Görler, T. Happel, P. Hennequin, Lechte C., et al.. Comprehensive experimental turbulence measurements for scale-resolved multichannel gyrokinetic code validation. TTF 2022: 2022 US-EU Joint Transport Task Force Workshop, Apr 2022, Santa Rosa, California, United States. ⟨hal-04417960⟩
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