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

Naohiro Kasuya, S. Sugita, Inagaki Shigeru, K. Itoh, M. Yagi, Sanae Itoh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number044010
JournalPlasma Physics and Controlled Fusion
Volume57
Issue number4
DOIs
Publication statusPublished - Apr 1 2015

Fingerprint

Plasma turbulence
plasma turbulence
toroidal plasmas
Hysteresis
hysteresis
Fluxes
gradients
Modulation
Turbulence
simulation
modulation
Interchanges
turbulence
heat
propagation
Reynolds stress
Plasmas
energy
causes
Experiments

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Simulation study of hysteresis in the gradient-flux relation in toroidal plasma turbulence. / Kasuya, Naohiro; Sugita, S.; Shigeru, Inagaki; Itoh, K.; Yagi, M.; Itoh, Sanae.

In: Plasma Physics and Controlled Fusion, Vol. 57, No. 4, 044010, 01.04.2015.

Research output: Contribution to journalArticle

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