摘要
利用二维相对论电磁粒子模拟程序研究了激光等离子体中电子热流在各向异性等离子体中的发展演化过程,提出了单位时间内等离子体临界表面上输运的能量与电子自由路程之间的函数关系,得到了用经典Spitzer-Harm理论来描述的电子热传导公式,探讨了经典电子热传导模型与被限制的自由热流随时间的变化情形。数值结果表明,强激光照射等离子体薄靶时的初始时刻电子热流迅速增大,但由于周边的自生磁场对电子的运动有限制作用,因此热流随时间缓慢地减少。对这些过程的研究对于电子热流的衰减和热输运等过程有重要意义。
The process of electronic heat flow of laser plasma interaction in anisotropic plasma is investigated by applying 2- Dimensional relativistic electromagnetic particle simulation program. The functional relation between energy flux at critical surface in per unit time and free path of electron is explained, and the electron heat flux expression described by classic Spitzer-Harm theory is deduced. Also, the classic electron heat flux model and situation of changes over time of limited free heat flow is discussed. The numerical simulation indicates that electronic heat flow which produced at the initial time of laser thin target interaction is increased, however, due to the restriction effect of surrounding self-generated magnetic field heat flow decrease with increase of time. The research on the field has play considerable role in understanding the electronic heat flux attenuation and heat transportation etc.
出处
《光学与光电技术》
2016年第3期78-81,共4页
Optics & Optoelectronic Technology
基金
国家自然科学基金(11164030
11465019)资助项目
