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Abstract <p>A hot-ion mode has been achieved on the spherical tokamak Globus-M2 with both hydrogen and deuterium injection of high-energy neutral beams. Deuterium injection is shown to provide higher ion temperatures, toroidal rotation velocities, and thermal energy confinement times compared to those for hydrogen. Furthermore, ion thermal diffusivity is close to neoclassical level in case of deuterium injection, whereas for hydrogen injection it is significantly higher. The gyrokinetic simulation indicates that the toroidal rotation velocity gradient created by the deuterium beam can suppress the ion temperature gradient instability, thereby enabling the attainment of high ion temperatures. These results are important for understanding the mechanisms of energy confinement in spherical tokamaks.</p>

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Characteristics of Hot Ion Mode in Globus-M2 Spherical Tokamak

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • E. E. Tkachenko,
  • G. S. Kurskiev,
  • I. V. Miroshnikov,
  • N. V. Sakharov,
  • V. K. Gusev,
  • V. B. Minaev,
  • Yu. V. Petrov,
  • A. Yu. Telnova,
  • N. N. Bakharev,
  • E. O. Kiselev,
  • N. S. Zhiltsov,
  • P. B. Shchegolev,
  • I. M. Balachenkov,
  • V. I. Varfolomeev,
  • V. Yu. Goryainov,
  • A. A. Kavin,
  • S. V. Krikunov,
  • A. D. Melnik,
  • A. B. Mineev,
  • A. N. Novokhatsky,
  • M. I. Patrov,
  • A. M. Ponomarenko,
  • O. M. Skrekel,
  • V. A. Solovey,
  • V. V. Solokha,
  • V. A. Tokarev,
  • S. Yu. Tolstyakov,
  • E. A. Tukhmeneva,
  • N. A. Khromov,
  • F. V. Chernyshev,
  • K. D. Shulyatiev,
  • A. Yu. Yashin

摘要

Abstract

A hot-ion mode has been achieved on the spherical tokamak Globus-M2 with both hydrogen and deuterium injection of high-energy neutral beams. Deuterium injection is shown to provide higher ion temperatures, toroidal rotation velocities, and thermal energy confinement times compared to those for hydrogen. Furthermore, ion thermal diffusivity is close to neoclassical level in case of deuterium injection, whereas for hydrogen injection it is significantly higher. The gyrokinetic simulation indicates that the toroidal rotation velocity gradient created by the deuterium beam can suppress the ion temperature gradient instability, thereby enabling the attainment of high ion temperatures. These results are important for understanding the mechanisms of energy confinement in spherical tokamaks.