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

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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.

作者简介

A. Tokarev

Peter the Great St. Petersburg Polytechnic University

编辑信件的主要联系方式.
Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 195251

A. Yashin

Peter the Great St. Petersburg Polytechnic University

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 195251

A. Ponomarenko

Peter the Great St. Petersburg Polytechnic University

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 195251

V. Gusev

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 194021

N. Zhiltsov

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 194021

G. Kurskiev

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 194021

V. Minaev

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 194021

Yu. Petrov

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 194021

N. Sakharov

Ioffe Institute, Russian Academy of Sciences

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 194021

V. Solokha

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

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 195251; St. Petersburg, 194021

V. Velizhanin

Peter the Great St. Petersburg Polytechnic University

Email: tokarev_ayu@spbstu.ru
俄罗斯联邦, St. Petersburg, 195251

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