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RAS PhysicsФизика плазмы Plasma Physics Reports

  • ISSN (Print) 0367-2921
  • ISSN (Online) 3034-6371

PROCESSES DETERMINING THE ENERGY CONFINEMENT IN TOKAMAK PLASMAS

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PII
S30346371S0367292125030022-1
DOI
10.7868/S3034637125030022
Publication type
Article
Status
Published
Authors
K. A. Razumova
  • Affiliation: National Research Centre “Kurchatov Institute”
V. F. Andreev
  • Affiliation: National Research Centre “Kurchatov Institute”
L. G. Eliseev
  • Affiliation: National Research Centre “Kurchatov Institute”
M. Yu. Kantor
  • Affiliation: Ioffe Institute, Russian Academy of Sciences
N. V. Kasyanova
  • Affiliation:
    National Research Centre “Kurchatov Institute”
    Moscow Institute of Physics and Technology
S. E. Lysenko
  • Affiliation: National Research Centre “Kurchatov Institute”
A. V. Melnikov
  • Affiliation:
    National Research Centre “Kurchatov Institute”
    Moscow Institute of Physics and Technology
    National Research Nuclear University MEPHI
N. S. Sergeev
  • Affiliation: National Research Nuclear University MEPHI
Volume/ Edition
Volume 51 / Issue number 3
Pages
270-281
Abstract
In a brief review, we discuss the processes associated with plasma self-organization in tokamaks, and the model of the self-consistent pressure profiles formation used in the energy and particle balance equations. Plasma self-organization can be interpreted as the formation of a structure consisting from chain of magnetic islands, each of which can form a self-consistent pressure profile. The convergence of island chains leads to anomalous transport, and their divergence leads to the formation of transport barriers. In the proposed model, the total energy flux Γ consists of two main parts: Γ and Γ, where Γ corresponds to a self-consistent pressure profile, and the anomalous turbulent flux Γ appears, when the pressure profile is distorted by additional heating/cooling, as well as the neoclassical flux Γ. The electron pressure profiles obtained by Thomson scattering in plasmas with magnetic islands and the effect of sawtooth oscillations on the anomalous Γ flux are analyzed. We present examples of the plasma confinement deterioration due to the nonoptimal deposition of additional heating power, and the confinement improvement due to increased radiation losses at the edge, leading to diminishing the level of magnetic fluctuations, which can be associated with the divergence of the chain of magnetic islands or with a decrease in the size of the islands.
Keywords
удержание плазмы в токамаке самоорганизация турбулентность магнитные острова
Date of publication
23.03.2025
Year of publication
2025
Number of purchasers
0
Views
39

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