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

A. PONOMARENKO; A. YASHIN; V. GUSEV; E. KISELEV; G. KURSKIEV; V. MINAEV; Y. PETROV; N. SAKHAROV; P. SHCHEGOLEV; E. TKACHENKO; N. ZHILTSOV

doi:10.1088/2058-6272/ad5fe5

Plasma Science and Technology > 2024 > 26(10): 105101. > DOI: 10.1088/2058-6272/ad5fe5

A. PONOMARENKO, A. YASHIN, V. GUSEV, E. KISELEV, G. KURSKIEV, V. MINAEV, Y. PETROV, N. SAKHAROV, P. SHCHEGOLEV, E. TKACHENKO, N. ZHILTSOV. First results of turbulence investigation on Globus-M2 using radial correlation Doppler reflectometry[J]. Plasma Science and Technology, 2024, 26(10): 105101. DOI: 10.1088/2058-6272/ad5fe5

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

1.
Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia
2.
Ioffe Institute, St. Petersburg 194064, Russia

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Author Bio:
A. PONOMARENKO: annap2000dreeonn@gmail.com
Corresponding author:
A. PONOMARENKO, annap2000dreeonn@gmail.com
Received Date: March 03, 2024
Revised Date: July 02, 2024
Accepted Date: July 05, 2024
Available Online: July 06, 2024
Published Date: August 28, 2024

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Abstract

Abstract

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 $\rho=$ 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 $\rho =$ 0.75 in L-mode and H-mode on Globus-M2 was the ion temperature gradient (ITG) mode.
- tokamak,
- turbulence,
- Doppler backscattering,
- correlation reflectometry

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Acknowledgments

The work was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation in the framework of the State Contract in the Field of Science (No. FSEG-2024-0005), using the Federal Joint Research Center “Material science and characterization in advanced technology” of Ioffe Institute, including the unique scientific facility “Spherical tokamak Globus-M”. The results of the modeling were obtained using computational resources of Peter the Great Saint-Petersburg Polytechnic University Supercomputing Center (www.scc.spbstu.ru).

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

Abstract