Spontaneous and Induced Transient Processes in Plasma of the L-2M Stellarator in High-Power ECR Heating Regime

IF 0.9 4区物理与天体物理 Q4 PHYSICS, FLUIDS & PLASMAS

Plasma Physics Reports Pub Date : 2024-10-27 DOI:10.1134/S1063780X24600919

D. G. Vasilkov, V. D. Borzosekov, N. N. Skvortsova, N. K. Kharchev

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Abstract

Comparative analysis of time evolutions of plasma macro- and microparameters during spontaneous and induced transient processes in the classical quasi-stationary stellarator L-2M is presented. Plasma heating was performed in the electron cyclotron resonance heating (ECRH) regime at the second harmonic of electron gyrofrequency under conditions of high specific energy input in the power range of 0.8−2 MW/m³. Spontaneous transient processes are observed at constant heating powers, and induced ones are initiated by a stepwise increase or decrease in heating power. Correlation between time evolutions of plasma macroparameters (primarily the energy lifetime) and the parameters of plasma turbulence is searched. Physical models of the phenomena that determine dynamic changes in plasma macroparameters are presented. Analysis of the data of high-frequency diagnostics made it possible to clear up the action of MHD and kinetic instabilities on transient processes in the stellarator hot plasma, as well as the role of plasma-wall interaction.

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L-2M 恒星器等离子体在高功率 ECR 加热状态下的自发和诱导瞬态过程

报告对经典准稳态恒星器L-2M中自发和诱导瞬态过程中等离子体宏观和微观参数的时间演变进行了比较分析。等离子体加热是在电子回旋频率二次谐波的电子回旋共振加热（ECRH）机制下进行的，条件是在 0.8-2 MW/m3 功率范围内的高比能量输入。在恒定加热功率下观察到自发瞬态过程，而加热功率的逐步增大或减小则会引发诱导瞬态过程。研究了等离子体宏观参数（主要是能量寿命）的时间演变与等离子体湍流参数之间的相关性。介绍了决定等离子体宏观参数动态变化的物理现象模型。通过对高频诊断数据的分析，可以明确 MHD 和动力学不稳定性对恒星器热等离子体瞬态过程的影响，以及等离子体与壁相互作用的作用。

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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.