Results 301 to 310 of about 211,167 (339)

Natural Velocity of Magnetic Islands

Physical Review Letters, 2005
The phase velocity of magnetic islands is calculated in the semicollisional regime with cold ions. Two solution branches arise, corresponding to islands propagating with the ions and with the electrons. For the ion branch the phase velocity and the polarization current are small.
openaire   +2 more sources

Magnetic island growth

The Physics of Fluids, 1984
The response of a finite conductivity plasma to resonant magnetic perturbations is studied. The equations, which are derived for the time development of magnetic islands, help one to interpret the singular currents which occur under the assumption of perfect plasma conductivity. The relation to the Rutherford regime of resistive instabilities is given.
openaire   +2 more sources

The ISLAND module for computing magnetic island widths in tokamaks

Journal of Plasma Physics, 2006
The ISLAND module in the National Transport Code Collaboration (NTCC) Module Library computes the saturated widths of multiple magnetic islands due to neoclassical tearing modes by implementing a quasi-linear model that includes the effects of arbitrary aspect ratio. cross-sectional shape, and plasma beta.
F. D. HALPERN, G. BATEMAN, A. H. KRITZ, A. Y. PANKIN   +3 more
openaire   +1 more source

Rotation and Locking of Magnetic Islands

Physical Review Letters, 1997
The polarization drifts arising from the acceleration of plasma flowing alongside a magnetic island are shown to be destabilizing. A critical island width is found above which the polarization drifts (inertial forces) defeat the stabilizing effect of the viscous forces and prevent islands from being unlocked by increasing the plasma rotation.
F. L. Waelbroeck, R. Fitzpatrick
openaire   +1 more source

Reconnection of coalescing magnetic islands

Physics of Plasmas, 1999
The dynamics of magnetic reconnection in the framework of two-dimensional incompressible magnetohydrodynamics is studied numerically. The case of a doubly periodic array of magnetic islands where coalescence of neighboring islands occurs due to self-consistent magnetic forces is investigated.
C. Marliani, H. R. Strauss
openaire   +1 more source

Explosive Coalescence of Magnetic Islands

IEEE Transactions on Plasma Science, 1986
An explosive reconnection process associated with nonlinear evolution of the coalescence instability is found through studies of particle and magnetohydrodynamic (MHD) simulations. The explosive coalescence is a self-similar process of magnetic collapse, in which the magnetic and electrostatic energies and temperatures explode toward the explosion time
T. Tajima, J.-I. Sakai
openaire   +1 more source

Evolution of magnetic islands in tokamaks

Nuclear Fusion, 1980
The evolution of magnetic islands is studied by a variational method on the assumption that it consists of a sequence of equilibria. The characteristic time of the evolution is then a resistive time. The sequence may, however, reach a configuration where the angle of the flux lines at the X-point vanishes. This behaviour is plausible in the case of q =
M. Dubois, A. Samain
openaire   +1 more source

Magnetic islands in a magnetized plasma with electron flow

Physical Review E, 1998
A system of two coupled nonlinear equations describing magnetic electron modes in a magnetized inhomogeneous plasma with a spatially dependent electron flow is derived. For a homogeneous basic state electron concentration, the two equations can be decoupled, and a nonlinear solution for the magnetic field in the form of a traveling stationary vortex ...
openaire   +1 more source

Magnetic Island

2021
Al largo della città di Townsville, in Australia, c'è quella che deve il suo nome alle anomalie registrate sulle bussole dal capitano James Cook nel 1770, mentre navigava in zona. Ma di "isole magnetiche" si parla anche in fisica nucleare e, in particolare, nella fisica del plasma, noto anche come quarto stato della materia. Ne scopriamo l'importanza
openaire   +1 more source

Magnetism in Heard Island rocks

Journal of Geophysical Research, 1965
The directions of remanent magnetization in igneous rocks from Heard Island show both negative and positive polarities. Their mean, irrespective of sign, is close to the hypothetical axial geocentric dipole field but differs from it by an amount which is about equal to the error in the determination. This divergence may not be real and requires further
E. Irving, P. J. Stephenson, A. Major
openaire   +1 more source