skip to main content

Title: On violation of local closure of transport relation in high-temperature magnetized plasmas

Rapid propagation of heat modulation and a hysteresis in the gradient-flux relation are found in a global nonlinear simulation of drift-interchange mode turbulence in toroidal helical plasmas. A global mode is excited nonlinearly and induces the turbulence flux in a limited radial region. The nonlinear couplings take a finite temporal duration for redistributing the energy. The mode also has a seesaw effect: increase of the amplitude of the global mode, at the other radii, works to absorb the energy form microscopic modes to suppress the turbulence. Successive excitations of microscopic modes cause the accelerated propagation of change of the heat flux like turbulence spreading after the onset of modulation. Owing to these processes, the hysteresis appears in the gradient-flux relation, which is compared with experiments.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [4] ;  [2]
  1. Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
  2. (Japan)
  3. International Digital Earth Applied Science Research Center, Chubu University, Kasugai, Aichi 487-8501 (Japan)
  4. Research Center for Plasma Turbulence, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
Publication Date:
OSTI Identifier:
22403241
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HEAT; HEAT FLUX; HYSTERESIS; MODULATION; NONLINEAR PROBLEMS; PLASMA; TEMPERATURE RANGE 0400-1000 K; TURBULENCE; VIOLATIONS