等离子体通道中的自生磁场

SELF GENERATED MAGNETIC FIELDPRODUCED IN PREPLASMA CHANNEL

研究了超短脉冲强激光在等离子体通道中传播时产生的自生磁场．利用相对论动量方程和泊松方程及安培定律得出自生磁场的一个基本公式，在此基础上解析并数值研究了通道中产生的自生磁场的特性和结构，初步探讨了超短脉冲强激光在等离子体中传播时形成的排空效应对自生磁场的影响。

An equation for self generated magnetic field is derived,and is used to investigate the self generated magnetic field produced by an intense short laser pulse in preplasma channel.The results show that the magnetic field can be generated by the ponderomotive mechanism,and the cavitation influences the magnetic field.The structure of the magnetic field in a plasma channel is also demonstrated.