Effects of radial electric field on suppression of electron-temperature-gradient mode through multiscale nonlinear interactions

Chanho Moon, Toshiro Kaneko, Kimitaka Itoh, Katsumi Ida, Tatsuya Kobayashi, Shigeru Inagaki, Sanae I. Itoh, Rikizo Hatakeyama

Research output: Contribution to journalArticle

Abstract

Turbulence in fluids and plasmas is ubiquitous in Nature and in the laboratory. Contrary to the importance of the 'scale-free' nature of cascade in neutral fluid turbulence, the turbulence in plasma is characterised by dynamics of distinct length scales. The cross-scale interactions can be highly non-symmetric so as to generate the plasma turbulence structures. Here we report that the system of hyper-fine electron-temperature-gradient (ETG) fluctuations and microscopic drift-wave (DW) fluctuations is strongly influenced by the sign of the gradient of the radial electric field through multiscale nonlinear interactions. The selective suppression effects by radial electric field inhomogeneity on DW mode induce a new route to modify ETG mode. This suppression mechanism shows disparity with respect to the sign of the radial electric field inhomogeneity, which can be driven by turbulence, so that it could be a new source for symmetry breaking in the turbulence structure formation in plasmas.

Original languageEnglish
Article number105007
JournalPlasma Physics and Controlled Fusion
Volume58
Issue number10
DOIs
Publication statusPublished - Aug 31 2016

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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