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为了理解超强激光与等离子体相互作用中产生的电子热传导特性,采用相对论电磁粒子模拟程序,估算了激光功率密度下,在等离子体表面所形成的热能和热流的空间分布,得到了超热电子和经典SpitzerHarm理论描述的电子热流随时间的演化情形。结果表明,在飞秒强激光脉冲作用下产生的等离子体,温度梯度非常大,以致电子的热自由程超过温度梯度的标尺长度,因此,不能使用经典的局域型热传导模型,而用的非局域型热传导模型。
In order to understand the electronic thermal conduction characteristics generated by the interaction between superlaser and plasma, the relativistic electromagnetic particle simulation program was used to estimate the spatial distribution of thermal energy and heat flux formed on the plasma surface under the laser power density. And the evolution of the electron heat flow over time, as described by the classical SpitzerHarm theory. The results show that the plasma produced under the action of femtosecond intense laser pulses has a very large temperature gradient so that the thermal free path of the electrons exceeds the length of the scale of the temperature gradient. Therefore, the classical local heat conduction model can not be used, Local Heat Transfer Model.