530 / 2019-03-19 22:09:08

Numerical investigation on the effects of self-generated magnetic field in laser driven inertial confinement fusion

magnetic field,MULTI-2D,laser ICF,hohlraum

全体主题 > Laser and Particle Beam Fusion

Magnetic field could have important effects on the behavior of plasma in laser driven inertial confinement fusion by modifying transport coefficients and hydrodynamics. In axial symmetrical coordinates, magnetic fields perpendicular to the plane of calculation can be spontaneously generated by the Biermann battery effect, when the gradients of density and temperature are not parallel. Nowadays, the azimuthal magnetic field generated by nanosecond laser has been investigated analytically by S. Eliezer [1], and experimentally by C. K. Li et al [2] on the Omega facility. However, the effects of self-generated magnetic field on the interaction of laser-plasma in a hohlraum under the conditions of Shenguang-III facility are not yet sufficiently investigated.
In this report, we study the influence of the self-generated magnetic field on the laser-plasma interaction by using the newly upgraded code MULTI-2D [3, 4]. The latest MULTI-2D is a radiation magneto-hydrodynamic code with two temperatures and an azimuthal magnetic field package. Firstly, we describe the generation mechanism and the corresponding numerical algorithm. Then we test the magnetic field module by considering the incidence of a nanosecond laser onto a planar target (Fig. 1a), where an analytical estimation is available. After that, the module is validated by comparing our simulation results with the experimental results achieved by C. K. Li et al. on the Omega facility (Fig. 1b). Finally, the self-generated magnetic field and its effects on the plasma behavior are studied under the conditions of Shenguang-III facility.