Simulation study of hysteresis in the gradient-flux relation in toroidal plasma turbulence

N. Kasuya, S. Sugita, S. Inagaki, K. Itoh, M. Yagi, S. I. Itoh

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)


Global nonlinear simulations with heat modulation are carried out to understand the turbulent transport mechanism in toroidal plasmas. Rapid propagation of the heat modulation and a hysteresis in the gradient-flux relation are found in the turbulent simulation of drift-interchange modes. A global mode is excited nonlinearly, and the nonlinear couplings with Reynolds stress take a finite temporal duration for self-consistent redistribution of the energy. The mode also has a seesaw effect: increase of the amplitude of the global mode at one position affects the turbulence at the other radial position not by inducing the radial flux by itself, but by absorbing the energy from microscopic modes. Successive excitations of microscopic modes cause the accelerated propagation of the flux change like turbulence spreading after the onset of modulation. Owing to these non-diffusive processes, the hysteresis appears in the gradient-flux relation, which is compared with experiments.

ジャーナルPlasma Physics and Controlled Fusion
出版ステータス出版済み - 4月 1 2015

!!!All Science Journal Classification (ASJC) codes

  • 原子力エネルギーおよび原子力工学
  • 凝縮系物理学


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