3月20日 Axion-Electrodynamic Revisions of Taylor's Results: Force-Free State with Electric Fields in Fusion Plasmas

题目：Axion-Electrodynamic Revisions of Taylor's Results: Force-Free State with Electric Fields in Fusion Plasmas

报告人：范培锋

报告时间：3月20日14:30-16:30

报告地点：控制大厅2楼会议室

主持人：伍兴权

摘要：Force-free magnetic fields play a crucial role in astrophysical and fusion plasmas, particularly in reversed field pinch (RFP) experiments. The classical Woltjer-Taylor state describes a force-free configuration where the current is parallel to the magnetic field, but it does not account for electric fields, which are essential in fusion plasmas. This study extend Taylor’s model by incorporating electric fields using axion electrodynamics, where the current and charge density are determined by the axion field. Solving for electromagnetic fields in cylindrical geometry, we recover Taylor’s results in the limit of vanishing electric fields. For specific parameters, the solutions take the form of modified Bessel functions, revealing structures such as "current holes," which have been observed in Tokamak experiments but not in RFP systems. These results offer new insights into the role of electric fields in force-free plasmas and their impact on fusion confinement dynamics.

个人简介：

范培锋，博士，安徽大学讲师。2019年毕业于中国科学院等离子体物理研究所，并获得中国科学技术大学等离子体物理学博士学位。2018年获得国家留学基金委资助，并于2018年10月至2019年10月赴美国普林斯顿等离子体国家实验室(PPPL)进行学术访问。2019年12月至2021年12月，在深圳大学李建刚院士工作站从事博士后研究工作，并于2021年9月被评为深圳大学优秀博士后。主要研究方向包括经典等离子体物理场论、回旋动理学理论以及等离子体动理学输运理论与模拟。主持国家自然科学基金1项，以第一作者发表SCI论文6篇，以通讯作者发表论文2篇。