Magnetic topology and current channels in plasmas with toroidal current density inversions

Effects of magnetic shear on toroidal rotation in tokamak plasmas with lower hybrid current drive.

Application of lower hybrid (LH) current drive in tokamak plasmas can induce both co- and countercurrent directed changes in toroidal rotation, depending on the core q profile. For discharges with q(0) <1, rotation increments in the countercurrent direction are observed. If the LH-driven current is sufficient to suppress sawteeth and increase q(0) above unity, the core toroidal rotation change ...

Density limits in toroidal plasmas

In addition to the operational limits imposed by MHD stability on plasma current and pressure, an independent limit on plasma density is observed in confined toroidal plasmas. This review attempts to summarize recent work on the phenomenology and physics of the density limit. Perhaps the most surprising result is that all of the toroidal confinement devices considered operate in similar ranges ...

PUBLISHED VERSION Effects of Magnetic Shear on Toroidal Rotation in Tokamak Plasmas with Lower Hybrid Current Drive

Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas

The coupling between the transport and magnetic topology is an important issue because the structure of magnetic islands, embedded in a toroidal equilibrium field, depends on the nature of the transport at the edge of the islands. Measurements of modulated heat pulse propagation in the DIII-D tokamak have revealed the existence of self-regulated oscillations in the radial energy transport into ...

Comparative Analysis of Current Density Meters Operating in Space Plasmas

For experimental investigations of wave processes in space plasma one of the main tasks is the determination of dispersion relations between the wave vector and the frequency. The frequency analysis of fluctuations of magnetic field and electric current density in plasma is very efficient in this case. The measurements of the magnetic field fluctuations usually are made by a variety of magnetom...