A 3D numerical analysis on magnetic field enhanced microwave linear plasma

Numerical Linear Algebra for Nonlinear Microwave Imaging

A nonlinear inverse scattering problem arising in microwave imaging is analyzed and numerically solved. In particular, the dielectricproperties of an inhomogeneous object (i.e., the image to restore) are retrievedbymeans of its scatteredmicrowave electromagneticfield (i.e., the input data) in a tomographic arrangement. From a theoretical point of view, the model gives rise to a nonlinear integr...

Reconstruction of Solar Coronal Linear Force-Free Magnetic Field

Numerical Analysis of Magnetic Field Amplification by Turbulence

We apply a Fourier spectral numerical method to 3D incompressible MHD turbulence with a magnetic Prandtl number Pr ≥ 1. We examine the processes by which an initially weak, large-scale seed magnetic field and an initially weak, small-scale, impulse-like seed magnetic field are amplified. We find that in both cases the magnetic energy spectrum grows at all scales. The growth rates at different a...

Parametric excitation of a magnetic nanocontact by a microwave field.

We demonstrate that magnetic oscillations of a current-biased magnetic nanocontact can be parametrically excited by a microwave field applied at twice the resonant frequency of the oscillation. The threshold microwave amplitude for the onset of the oscillation decreases with increasing bias current, and vanishes at the transition to the auto-oscillation regime. Theoretical analysis shows that m...

Ultracold Plasma Dynamics in a Magnetic Field

Title of dissertation: ULTRACOLD PLASMA DYNAMICS IN A MAGNETIC FIELD Xianli Zhang, Doctor of Philosophy, 2009 Dissertation directed by: Professor Steven Rolston Department of Physics Plasmas, often called the fourth state of matter and the most common one in the universe, have parameters varying by many orders of magnitude, from temperature of a few hundred kelvin in the Earth’s ionosphere to 1...