报告题目：Physics of plasma flow and acceleration in the magnetic nozzle

报告人：Andrei Smolyakov

报告时间：2025年4月8日9：00 –15：30

报告地点：博习楼221

报告邀请人：徐亮

报告摘要：This talk overviews the basic physics of plasma acceleration in the converging-diverging magnetic field configurations such as magnetic mirrors for plasma confinement and magnetic nozzle for electric propulsion.  A simple fluid model of the quasineutral plasma flow in the magnetic nozzle predicts a unique profile of the accelerated plasma strongly coupled to the magnetic field profile via the regularization condition at the sonic point, i.e. at the point where the plasma flow velocity is equal to the local ion sound velocity. The results of the full kinetic model for ions and electrons, including the Poisson equation, demonstrate similar robustness of the global profiles of plasma density, ion velocity, and potential profiles. The development of anisotropies in electron and plasma pressure, electron and ion heat fluxes, energy conversion between electrons and ions and their role on plasma acceleration are discussed using fluid and kinetic models. Results of 2D and 3D kinetic PIC simulations will be presented. Conversion of the energy of azimuthal plasma rotation and magnetic field and resulting plasma acceleration are discussed using the electromagnetic model.

报告人简介：Andrei Smolyakov is a Professor in the Department of Physics and Engineering Physics at the University of Saskatchewan, Canada. His research interests include basic plasma physics with applications to magnetic fusion, laboratory plasmas, and plasma for electric propulsion. He is a Fellow of American Physical Society, a member of the editorial boards for several plasma physics journals and serves as an Associate Editor for Physics of Plasmas.