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Abstract <p>The article presents the results of the analysis of the density profile peaking factor and the inverse density gradient scale length (IDGSL) after switching-on the on-axis electron cyclotron resonance heating (ECRH) in the T-10 tokamak. Two series of experiments with different chord-averaged densities in the ohmic regime before the ECRH switching-on are considered. In each series, the total plasma current was changed from shot to shot at a fixed chord-averaged density and the ECRH power. In this case, the ECRH power was several times higher than the ohmic heating power. It was shown that at the ECRH stage, the density profile peaking factor and the IDGSL become almost the same in each series of experiments. This circumstance indicates the formation of the “stiff” IDGSL with high-power on-axis ECRH. Such property of stiffness for the IDGSL requires its consideration in transport models, when we analyzing the density evolution.</p>

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Analysis of Density Profile Peaking during On-Axis ECR-Heating in the T-10 Tokamak

  • 期刊论文

  • 发表日期：

    2026年8月2日

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  • V. F. Andreev,
  • A. S. Aseev,
  • A. A. Borshchegovskij,
  • S. E. Lysenko,
  • T. B. Myalton,
  • I. N. Roy,
  • D. S. Sergeev

摘要

Abstract

The article presents the results of the analysis of the density profile peaking factor and the inverse density gradient scale length (IDGSL) after switching-on the on-axis electron cyclotron resonance heating (ECRH) in the T-10 tokamak. Two series of experiments with different chord-averaged densities in the ohmic regime before the ECRH switching-on are considered. In each series, the total plasma current was changed from shot to shot at a fixed chord-averaged density and the ECRH power. In this case, the ECRH power was several times higher than the ohmic heating power. It was shown that at the ECRH stage, the density profile peaking factor and the IDGSL become almost the same in each series of experiments. This circumstance indicates the formation of the “stiff” IDGSL with high-power on-axis ECRH. Such property of stiffness for the IDGSL requires its consideration in transport models, when we analyzing the density evolution.