First results of turbulence investigation on Globus-M2 using radial correlation Doppler reflectometry

被引：0

作者：

Ponomarenko, A. ^{[1
]}

Yashin, A. ^{[1
]}

Gusev, V. ^{[2
]}

Kiselev, E. ^{[2
]}

Kurskiev, G. ^{[2
]}

Minaev, V. ^{[2
]}

Petrov, Y. ^{[2
]}

Sakharov, N. ^{[2
]}

Shchegolev, P. ^{[2
]}

Tkachenko, E. ^{[2
]}

Zhiltsov, N. ^{[2
]}

机构：

[1] Peter Great St Petersburg Polytech Univ, St Petersburg 195251, Russia

[2] Ioffe Inst, St Petersburg 194064, Russia

来源：

PLASMA SCIENCE & TECHNOLOGY | 2024年 / 26卷 / 10期

关键词：

tokamak; turbulence; Doppler backscattering; correlation reflectometry; MODES; SHEAR;

D O I：

10.1088/2058-6272/ad5fe5

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The first results of investigation of the turbulence structure using Doppler backscattering (DBS) on the Globus-M2 tokamak are presented. A one-channel DBS system with a variable probing frequency within the 18-26 GHz range was installed to investigate the edge plasma at normalized minor radii 0.9-1.1. Radial correlation Doppler reflectometry was used to study the changes in turbulence eddies after the LH transition. Correlation analysis was applied to the phase derivative of complex in-phase and quadrature (IQ) signals of the DBS diagnostic as it contains information about the poloidal plasma rotation velocity. In L-mode, the radial correlation length L r is estimated to be 3 cm and after transition to H-mode reduces to approximately 2 cm. Gyrokinetic modelling in a linear local approximation using code GENE indicates that the instability with positive growth rate at the normalized minor radius 0.75 in L-mode and H-mode on Globus-M2 was the ion temperature gradient (ITG) mode.

引用

页数：7

共 30 条

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