Browsing by Department "Institute for Fusion Studies"
Now showing items 118 of 18

Angular redistribution of nonlinear perturbations: A universal feature of nonuniform flows
(201006)Classically, the net action of nonlinear turbulent processes is interpreted as either a direct or inverse cascade. However, in nonuniform/shear flows the dominant process is a nonlinear redistribution over wave number angle ... 
Asymmetrydriven structure formation in pair plasmas
(200912)The nonlinear propagation of electromagnetic waves in pair plasmas, in which the electrostatic potential plays a very important but subdominant role of a "binding glue" is investigated. Several mechanisms for structure ... 
Existence Of The Magnetorotational Instability
(200807)By posing and solving a global axisymmetric eigenvalue problem on an infinite domain with modes vanishing at zero and infinity for a differentially rotating MHD plasma, the conditions for the occurrence of a purely growing ... 
Global Axisymmetric Magnetorotational Instability With Density Gradients
(200805)We examine global incompressible axisymmetric perturbations of a differentially rotating MHD plasma with radial density gradients. It is shown that the standard magnetorotational instability (MRI) criterion drawn from the ... 
A Multivariate Fit Luminosity Function And World Model For Long GammaRay Bursts
(201304)It is proposed that the luminosity function, the restframe spectral correlations, and distributions of cosmological longduration (TypeII) gammaray bursts (LGRBs) may be very well described as a multivariate lognormal ... 
Parametric Amplification Of LaserDriven Acceleration In A Plasma Channel
(201206)Twodimensional particleincell simulations are presented for a laserirradiated soliddensity target with and without an underdense preplasma. It is shown that an underdense preplasma can generate an energetic electron ... 
Particle simulation of Lyapunov exponents in onecomponent strongly coupled plasmas
(199703)The Lyapunov exponents and instantaneous expansion rates in a phase space of Coulomb manybody systems are measured with the use of a threedimensional particle code SCOPE [K. Nishihara, Kakuyugo Kenkyu 66, 253 (1991)]. ... 
Penetration And Scattering Of Lower Hybrid Waves By Density Fluctuations
(201406)Lower Hybrid [LH] ray propagation in toroidal plasma is controlled by a combination of the azimuthal spectrum launched from the antenna, the poloidal variation of the magnetic field, and the scattering of the waves by the ... 
Plasma acceleration and cooling by strong laser field due to the action of radiation reaction force
(200812)It is shown that for super intense laser pulses propagating in a hot plasma, the action of the radiation reaction force (appropriately incorporated into the equations of motion) causes strong bulk plasma motion with the ... 
Real Beads On Virtual Strings: Charged Particles On Magnetic Field Lines
(201211)We discuss a similarity between the drift of a charged particle inside a slowly moving solenoid and the motion of a fluid element in an ideal incompressible fluid. This similarity can serve as a useful instructional example ... 
Riemann Ellipsoids: Hamiltonian Formulation and Stability Analysis
(2015)The equilibria and stability of selfgravitating liquid masses has been studied and debated for more than a century by great physicists and mathematicians such as Newton, Maclaurin, Jacobi, Poincaré, Dirichlet, Riemann, ... 
Selfmodulation of nonlinear Alfven waves in a strongly magnetized relativistic electronpositron plasma
(201308)We study the selfmodulation of a circularly polarized Alfven wave in a strongly magnetized relativistic electronpositron plasma with finite temperature. This nonlinear wave corresponds to an exact solution of the equations, ... 
Selfmodulation of nonlinear waves in a weakly magnetized relativistic electronpositron plasma with temperature
(201204)We develop a nonlinear theory for selfmodulation of a circularly polarized electromagnetic wave in a relativistic hot weakly magnetized electronpositron plasma. The case of parallel propagation along an ambient magnetic ... 
Spectrum Of Global Magnetorotational Instability In A Narrow Transition Layer
(200906)The global magnetorotational instability is investigated for a configuration in which the rotation frequency changes only in a narrow transition region. If the vertical wavelength of the unstable mode is of the same order ... 
Transport Properties in Nontwist AreaPreserving Maps
(200912)Nontwist systems, common in the dynamical descriptions of fluids and plasmas, possess a shearless curve with a concomitant transport barrier that eliminates or reduces chaotic transport, even after its breakdown. In order ... 
Turbulence and biasinduced flows in simple magnetized toroidal plasmas
(201105)Turbulence and biasinduced flows in simple magnetized toroidal plasmas are explored with global threedimensional fluid simulations, focusing on the parameters of the Helimak experiment. The simulations show that plasma ... 
Twofluid temperaturedependent relativistic waves in magnetized streaming pair plasmas
(201002)A relativistic twofluid temperaturedependent approach for a streaming magnetized pair plasma is considered. Such a scenario corresponds to secondary plasmas created at the polar caps of pulsar magnetospheres. In the model ... 
Vortex bubble formation in pair plasmas
(201307)It is shown that delocalized vortex solitons in relativistic pair plasmas with small temperature asymmetries can be unstable for intermediate intensities of the background electromagnetic field. Instability leads to the ...