摘要
分析了脉冲功率传输线建立磁绝缘的暂态过程,对暂态过程中传输线的击穿与磁绝缘关系、电子的分布规律及其与建立磁绝缘的关系进行了阐述。分析了磁绝缘传输线电极间的电子分布改变传输线工作阻抗值的现象,给出了传输线稳态工作阻抗的求解方法和用稳态工作阻抗计算传输线暂态工作阻抗的方法。研究了截面尺寸变化时传输线中电子的分布和电磁波传播的折反射情况。结果表明:传输线在建立磁绝缘的过程中损失电子是必然的,损失电子是建立磁绝缘的必要条件。截面半径沿轴向变化时,其工作特性与极间距的变化有关。极间距增大时,后半段的电子电流增大,使其工作阻抗增大并与前半段相等,因而在尺寸变化处不产生反射波。极间距减小时,由于后半段提前产生损失电子,因而尺寸变化处产生反射波。
The magnetic insulation establishment in a pulsed power transmission line has been analyzed. The analysis involves in the interaction and dependence between the breakdown of the transmission line and the magnetic insulation. It illustrates how the emission and the distribution patterns of the electrons contribute to the establishment of magnetic insulation. In addition, it shows how the distribution of electrons impacts the operating impedance of the transmission line. Based on the magnetic insulation steady-state models, an operating impedance calculation method is proposed using steady-state impedance to substitute the transient operating impedance. Through simulating transmission lines with varying radius, it is clarified that the regional operating impedances in different geometrical regions vary with the regional electron distributions. Finally, the change of the operating impedance of the magnetic insulation transmission lines with varying radius, its effects on the transmission characteristics of pulsed electromagnetic wave and the pulsed power are summarized.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2008年第3期487-491,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金资助课题(50677028)
高等学校博士点专项科研基金资助课题(20050003007)
关键词
脉冲功率
磁绝缘传输线
暂态过程
工作阻抗
Pulsed power
Magnetic insulation trasmission lines
Transient process
Operating impedance
