電漿學分學程系列演講 暨 電漿所專題演講

Abstract

The Universe is filled with magnetic turbulence and it plays important role in cosmic-ray generation, for example, by supernova remnants (SNRs) in our galaxy, and in AGN jets far in the Universe. How such magnetic turbulence is generated? It is a long-standing open question in astrophysics and cosmology.

We proposed to use the biggest laser NIF, LLNL ( https://lasers.llnl.gov/science/discovery-science ) for fundamental science to study the growth of magnetic field in counter-streaming collisionless plasma in astrophysical condition. We have found linear to nonlinear stage of magnetic field growth to demonstrate a structure formation of shock waves. The shock waves are an engine to accelerate the cosmic-ray in the Universe.

Stating from a simple theory to PIC simulations, we have proposed such an experiment with huge laser system. After approval, an international team has worked together for the experiment and demonstrated the generation of magnetic turbulence and the formation of collisionless shock. In addition, charged particle acceleration was also observed.

We are happy with the experimental demonstration of shocks in Universe, while I wished to find the physics more intuitively with use of the fact found in the simulations and laser experiments. After developing such mode theory, I found that the intuitive theory can explain not only the magnetic turbulence, but also the physics of turbulent mixing induced by hydrodynamic instabilities, which is the most important physics in laser fusion.

In the talk, after showing how this theory can explain the shock and acceleration in SNR (SN1006) as shown below, then, I hope to ley you share the happiness of finding a universal theory in different physics.