Progress of the confinement study of Spheromak plasma is reviewed from the view point of APPLICATION OF TOKAMAK PHYSICS. Energy confinement time is around 0.1ms. Accuracy of comparison between theory and experiment was fairly improved by introduction of 3D simulation in two instability cases.
This is a brief review of the concept of multifractal which is successfully applied to the Rayleigh-Bénard convection and the intermittency of turbulent flow, and of the phasedynamics applicable to selforganization phenomena based upon the reaction-diffusion equation.
The Wigner distribution whose usefulness for analyzing non-stationary signals was recently re-discovered, is reviewed and applied to some plasma experimental data. It is shown that better time and frequency resolved spectra can be obtained with the Wigner distribution, when compared to the conventional Fast Fourier Transform (FFT).It is also shown that the pseudo spectra which appear in the Wigner distribution can be suppressed with the aid of FFT.