皮秒和飞秒激光技术的迅速发展，为激光等离子体物理开辟了新的理论和实验研究领域．自生磁场是激光与等离子体相互作用中很多物理过程的结果，反过来，自生磁场又对等离子体的运动产生直接或间接的影响．到目前为止，对环形磁场的理论和实验研究比较多．相比之下，对轴向磁场 The rapid development of picosecond and femtosecond laser technology opens up new theoretical and experimental research fields for laser plasma physics. The autogenous magnetic field is the result of many physical processes in the laser-plasma interaction, which in turn directly or indirectly affects the plasma’s motion. So far, there have been many theoretical and experimental studies on the ring magnetic field. In contrast, the axial magnetic field