对超热电子诱生的磁场分布的估算  

CONFIGURATION OF MAGNETIC FIELDS INDUCED BY SUPERTHERMAL ELECTRONS

作　　者：陈正林[1] 张杰[1] 

机构地区：[1]中国科学院物理研究所光物理开放研究实验室,北京100080

出　　处：《物理学报》2000年第11期2180-2185,共6页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号 :1982 5 110 );国家高科技惯性约束聚变基金资助的课题&&

摘　　要：利用简化模型估算了电荷分离场及由超热电子逃逸在等离子体表面产生的自生磁场的大小和空间分布 .受电荷分离场的影响以及超热电子逃逸数的限制 ,超热电子产生的环形磁场主要分布于等离子体表面附近的焦斑半径内 ,仅当超热电子束流很强时 (在 1μm半径截面内达到 10 3 A量级 ) ,环形磁场才可以达到 10 2 T量级 .一般情况下 ,由超热电子产生的磁场极小 .Charge separation electric fields and magnetic fields induced by superthermal electrons escaping from the plasmas have been evaluated using a very simple model. The magnitude and configuration of magnetic fields have been obtained. Generally the circular\|shaped magnetic fields are weak because of the charge separation electric field and the followed finite number of the escaping superthermal electrons, and they are mainly distributed over the laser focus near the surface of the plasma because of the transverse motion of the escaping superthermal electrons. Only when electron current is very strong (about 10 3A through the cross\|section with 1?μm radius) a 10 2?T magnetic field can be obtained.

关 键 词：磁场 超热电子 激光 等离子体 

分 类 号：TN24[电子电信—物理电子学]