The differences and similarities between the internal transport barriers (ITBs) of tokamak and
helical plasmas are reviewed. By comparing the characteristics of the ITBs in tokamak and …

The high plasma temperatures expected at reactor conditions in magnetic confinement
fusion toroidal devices suggest that near-marginal operation could be a reality in future …

For stellarators, which need no or only small amounts of current drive, electron-cyclotron-
resonance heating (ECRH) is a promising heating method even for the envisaged …

We report observations of the dynamic response of micro-fluctuations and turbulent flux to a
low-frequency heating power modulation in the Large Helical Device. The responses of heat …

This Letter presents the discovery of macroscale electron temperature fluctuations with a
long radial correlation length comparable to the plasma minor radius in a toroidal plasma …

Edge cooling experiments with a tracer-encapsulated solid pellet in the large helical device
(LHD) show a significant rise in core electron temperature (the maximum rise is around 1 …

Comprehensive electrostatic gyrokinetic linear stability calculations for ion-scale
microinstabilities in an LHD plasma with an ion-internal transport barrier (ITB) and carbon …

The driving and dam** mechanism of plasma flow is an important issue because flow
shear has a significant impact on turbulence in a plasma, which determines the transport in …

The suppression of core temperature fluctuations due to edge cooling in the J-TEXT
tokamak is presented. The supersonic molecular beam is injected into the low density …

A power-balance model, with radiation losses from impurities and neutrals, gives a unified
description of the density limit (DL) of the stellarator, the L-mode tokamak, and the reversed …