Results 221 to 230 of about 2,516,794 (265)
Some of the next articles are maybe not open access.
Chemical potential and magnetization of a Coulomb island
Physical Review B, 1994We consider variations of the low temperature chemical potential and magnetization of laterally confined two-dimensional interacting electrons in a strong magnetic field. Cases of axially symmetrical (a quantum dot) and strongly elongated (a quantum wire) spatial distributions of electron density are studied.
, Fogler, , Levin, , Shklovskii
openaire +2 more sources
Oscillating magnetic islands in a rotating plasma
Physics of Fluids B: Plasma Physics, 1990The nonlinear evolution of tearing modes in the presence of sheared mass flow is studied as an initial value problem. Under certain conditions, when the mode is driven unstable primarily by the mass flow, the nonlinear evolution leads to a dynamic state in which the size and shape of the magnetic islands are oscillatory.
Persson, M., Bondeson, A.
openaire +1 more source
Natural Velocity of Magnetic Islands
Physical Review Letters, 2005The 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
Macroscopic Coherent Magnetic Islands [PDF]
, 2000 We present experimental and theoretical investigations on the dynamics of coherent magnetic islands in high temperature, magnetically confined plasmas of thermonuclear interest, and of their effects on plasma transport.
F Porcelli +17 more
openaire +1 more source
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 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, 2006The 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 +3 more
openaire +1 more source
Rotation and Locking of Magnetic Islands
Physical Review Letters, 1997The 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
Self-sustained magnetic islands
Physics of Plasmas, 1996Numerical simulations of a single magnetic island evolution are presented in the regime where the island width is smaller than an ion Larmor radius. It is shown that the island rotation is controlled by particle diffusion due to collisions or a background of microturbulence. More precisely, for vanishing density gradient, the sign of rotation frequency
J. H. Chatenet, J. F. Luciani, X. Garbet
openaire +1 more source
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
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