Sanae I. Itoh

TL;DR: In this article, the role of zonal flows in the formation of an internal transport barrier in a toroidal helical plasma is analyzed, and it is shown that the turbulent transport coefficient is suppressed when the plasma state changes from the branch of a weak negative radial electric field to the strong positive one.

TL;DR: Yusuke KOSUGA as mentioned in this paper, Sanae-I. ITOH, Kimitaka ITOH and Kimita ITOH have proposed a method for the detection of plasmas.

TL;DR: In this article, the authors reviewed the properties of electrically conducting media from a macroscopic viewpoint based on mean-field magnetohydrodynamics, while being compared using the methodology and knowledge in fluid mechanics.

TL;DR: In this paper, a stochastic trigger by micro-turbulence for neoclassical tearing modes (NTMs) is studied and the boundary in the phase diagram is determined as the statistical long time average of the transition conditions.

TL;DR: In this paper, electric field fluctuations are directly measured using twin heavy-ion-beam probes in Compact Helical System (CHS) and the spectrum of the electric field fluctuation reveals the existence of a zonal flow at a frequency of less than 1 kHz, coherent modes with a long correlation length (conjectured as geodesic acoustic modes), and background turbulence.