The first experimental study of the MHD dynamo in a quasi-single-helicity (QSH) reversed-field pinch toroidal plasma is presented. In QSH plasmas, a dominant wave number appears in the velocity fluctuation spectrum. This velocity component extends throughout the plasma volume and couples with magnetic fluctuations to produce a significant MHD dynamo electric field. The narrowing of the velocity...

Geodesic acoustic mode(GAM) driven by energetic particles are observed in the Large Helical Device by a heavy ion beam probe. The GAM frequency shifts upward in plasmas with monotonic magnetic shear. In plasmas with reversed magnetic shear, on the other hand, the observed GAM and the energetic-particle induced mode, which is probably reversed-shear induced Alfvén Eigenmode(RSAE), appears, and t...

It is generally assumed that the electromagnetic spectrum in the primordial universe was a blackbody spectrum in vacuum. We derive the electromagnetic spectrum based on the fluctuation-dissipation theorem that describes the electromagnetic fluctuations in a plasma. Our description includes thermal and collisional effects in a plasma. The electromagnetic spectrum obtained differs from a blackbod...

Studies of turbulent transport in the H-1 heliac plasmas yield direct evidence of the reversal of the fluctuation-driven particle flux across the transition from low to high confinement mode. New types of transitions are characterized by significant fluctuation levels in the high confinement mode. The fluctuation-driven particle flux in the plasma core changes from outward to inward flow across...

The fluctuation-induced dynamo effect, resulting from the correlation between electron pressure fluctuation and radial magnetic in core, is measured by an cyclotron radiometer Faraday-effect polarimetry high-temperature tokamak plasmas. acts to flatten parallel current core of a confinement fusion device.