Numerical analysis of pulsed magnetic field diffusion dynamics in gold cone target

Abstract

Strong magnetic fields from a few hundred to a thousand tesla have been produced in a laboratory by using high-intensity laser beams. This strong magnetic field in a laboratory becomes a powerful tool to perform experiments in the fields such as laboratory astrophysics and nuclear fusion research. The diffusion dynamics of a pulsed magnetic field in a target is a key phenomenon for experiments with the laser-produced magnetic field. Here, we have developed a two-dimensional (2D) electromagnetic dynamics simulation code with consideration of inductive heating to simulate spatiotemporally resolved 2D profiles of the applied magnetic field in a target. The application of an external kilo-tesla-level magnetic field to a gold-cone-attached target is a promising scheme for the enhancement of heating efficiency of the fast-ignition inertial confinement fusion scheme. Our simulation revealed that the magnetic field heats the gold cone due to the inductive heating and penetrates the gold cone during its pulse duration. The developed simulation code is generally useful for designing and analyzing experiments using a strong magnetic field.