应用多频多普勒反向散射研究 Globus-M2 托卡马克的边缘局部模式

IF 0.9 4区物理与天体物理 Q4 PHYSICS, FLUIDS & PLASMAS Plasma Physics Reports Pub Date : 2024-06-25 DOI:10.1134/s1063780x24600518

A. Yu. Tokarev, A. Yu. Yashin, A. M. Ponomarenko, V. K. Gusev, N. S. Zhiltsov, G. S. Kurskiev, V. B. Minaev, Yu. V. Petrov, N. V. Sakharov, V. V. Solokha, V. A. Velizhanin

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引用次数: 0

摘要

摘要托卡马克中的高约束模式（H-模式）以等离子体边缘的高压力梯度为特征，这导致了边缘局部模式（ELMs）的出现。Globus-M2 球形托卡马克也对其进行了研究，主要是在中性束注入的情况下观测到边缘局部模。研究 ELM 的方法之一是使用安装在 Globus-M2 上的多普勒反向散射（DBS）诊断仪。它可以估算等离子体密度波动的幅度，并测量径向电场 Er。在这项工作中，研究了在 0.4 < ρ < 1.1 的径向范围内边缘局部模式对 Er 场的影响。结果表明，在 ELM 期间，电场在整个测量范围内都会增加。这表明 ELM 也会影响内部等离子体区域。这与有关 ELM 外围定位的一般观点不一致，但不仅在 Globus-M2 得到了实验证实。此外，还将 ELM 的测量结果与极限周期振荡（LCO）的测量结果进行了比较，结果表明，在极限周期振荡期间没有观察到这种影响。

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Application of Multi-Frequency Doppler Backscattering for Studying Edge Localized Modes at the Globus-M2 Tokamak

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 E_r. In this work, the effect of edge localized modes on the E_r 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.

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来源期刊

Plasma Physics Reports 物理-物理：流体与等离子体

CiteScore

1.90

自引率

36.40%

发文量

104

审稿时长

4-8 weeks

期刊介绍： Plasma Physics Reports is a peer reviewed journal devoted to plasma physics. The journal covers the following topics: high-temperature plasma physics related to the problem of controlled nuclear fusion based on magnetic and inertial confinement; physics of cosmic plasma, including magnetosphere plasma, sun and stellar plasma, etc.; gas discharge plasma and plasma generated by laser and particle beams. The journal also publishes papers on such related topics as plasma electronics, generation of radiation in plasma, and plasma diagnostics. As well as other original communications, the journal publishes topical reviews and conference proceedings.