Investigation Of The Fast Magnetic Reconnection Driven By Ponderomotive Force In Laser-plasma And The Gravito-modulational Instability In Gravito-plasma

With the social development, energy problem have become the bottleneck restriction factor for the social progress. The inertial confined fusion driven by multi-beam of high power lasers is a feasible way to solve the global problem. The fast magnetic reconnection phenomenon has been repeatedly observed in laser plasma experiments with multi-beam lasers irradiated target, but the convincing explanations have not been given by the existing models. Identify the mechanism that driven the fast magnetic reconnection can provide theoretical support to promote the realization of the laser fusion, and also can be extended to the studies of the magnetic reconnection and related phenomena in other plasma environment, such as magnetic confinement devices. On the other hand, based on the analogy between the plasma and gravitating media, and the research experience of linear and nonlinear plasma physics, it has obtained a lot of important results in the frame the Newton's gravity approximation, such as the rings of Saturn, the clustering structures, the large-scale pancake structures and the law of Titius-Bode, and so on. Under the more accurately Post-Newton approximation, the gravito-magnetic field effect will be considered, and more actual law for the gravity system will be obtained. It may make perfect to the gravitational field theory and provide some new ideas for development of the gravitational field theory.Firstly, we extend the model of fast magnetic reconnection to include plasmas with multiple-charged ions that we then apply to two-beam laser-solid interactions. Properties of the magnetic reconnection process, such as the reconnection time scale and jet velocity, are obtained with classical values of the Spitzer resistivity. The results are consistent with experimental measurements, which indicate that the phenomenon of fast magnetic reconnection can be well described by our model for magnetic reconnection driven by ponderomotive force.Secondly, under the approximation of Post-Newtonian as well as the weak-field, the modulational instabilities for longitudinal and transverse gravito-electromagnetic perturbations are investigated on the basis of the self-generated gravitomagnetic field equations in a self-gravitating system. The results indicate that the self-gravitating system is modulational instability. The characteristic scale of longitudinal perturbation is much larger than the transverse one. The anisotropic accumulation of matter and the generation of a gravitomagnetic field are in favor of the formation of a rotationally pancake-like structure.Finally, the summary of this paper have been given briefly, and prospects of the future work have been proposed.