Application of multi-frequency doppler backscattering for studying edge localized modes at the Globus-M2 tokamak

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Abstract

The high-confinement mode in tokamaks (H-mode) is characterized by high pressure gradients at plasma edge, which results in the appearance of edge localized modes (ELMs). They are studied at the Globus-M2 spherical tokamak too, where edge localized modes are observed mainly in regimes with neutral beam injection. One of the ways for studying ELMs is the use of the Doppler backscattering (DBS) diagnostics installed at Globus-M2. It makes possible to estimate the amplitude of plasma density fluctuations and measure the radial electric field Er. In this work, the effect of edge localized modes on the Er field is studied in the radial range 0.4 < ρ < 1.1. It is shown that during ELMs the electric field increases in the entire measurement range. This indicates that ELMs affect the inner plasma regions as well. This is not consistent with the general ideas concerning the peripheral localization of ELMs, but is confirmed experimentally not only at Globus-M2. In addition, the results for the regime with ELMs are compared with those for the regime with limit cycle oscillations (LCOs) and it is shown that during LCOs such effect is not observed.

About the authors

A. Y. Tokarev

Peter the Great St. Petersburg Polytechnic University

Author for correspondence.
Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 195251

A. Y. Yashin

Peter the Great St. Petersburg Polytechnic University

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 195251

A. M. Ponomarenko

Peter the Great St. Petersburg Polytechnic University

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 195251

V. K. Gusev

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 194021

N. S. Zhiltsov

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 194021

G. S. Kurskiev

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 194021

V. B. Minaev

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 194021

Yu. V. Petrov

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 194021

N. V. Sakharov

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 194021

V. Solokha

Peter the Great St. Petersburg Polytechnic University; Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 195251; St. Petersburg, 194021

V. A. Velizhanin

Peter the Great St. Petersburg Polytechnic University

Email: tokarev_ayu@spbstu.ru
Russian Federation, St. Petersburg, 195251

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