330 / 2019-02-26 14:53:16

The second type of sharp-front wave mechanism of strong magnetic field diffusion in metal

Megagauss,Magnetic Diffusion,Sharp-front diffusion wave

全体主题 > Fundamental Physics at Extremes

When a strong magnetic field diffuses into a metal, the metal is ablated by Joule heating companying the magnetic diffusion process, and the metal’s resistance changes violently with the fastly growing temperature. If the outer magnetic field B0 is above the threshold value Bc, which is determined by the critical temperature Tc of the metal.the magnetic diffusion process can be approximately described by the sharp-front diffusion wave theory [1], which gives a simple formulas for describing the velocity of diffusion process. However, if B0 is below Bc, the sharp-front diffusion wave theory is no longer applicable. In this situation, one would need another type of sharp-front diffusion wave theory (Type II Theory) to describe the magnetic diffusion behaviors. In Type II Theory, the sharp-front diffusion wave velocity depends on 3 parameters, i.e., the magnetic boundary condition B0, the critial temperature Tc, and the cold metal resistance ηs. The dependence of the velocity on the three parameters is analyzed in details in this presentation.