摘要
采用混合模型研究了周期永磁聚焦行波管中的离子噪声,编写了一维粒子模拟程序,并对行波管的离子噪声特性进行了分析;计算表明相同气压下,周期永磁聚焦离子噪声的频率比均匀聚焦要低,且频谱有所展宽;提出改善电子束匹配条件是降低离子噪声的有效方法。
Characteristics of ion noise in a traveling wave tube (TWT) focused by periodic permanent magnets (PPM) have been discussed by means of a hybrid model. One dimension Particle-in-Cell method (PIC) simulation code is developed. Compare to uniform magnetic field focus system the noise frequency is lower and the spectrum is wider by the PPM focus system. From the analysis results we find decreasing the axial electrostatic potential well would reduce this noise.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2004年第3期258-261,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金资助项目(60271001
10276011)
霍英东基金资助项目(81007)
关键词
离子噪声
行波管
静电势阱
粒子模拟
ion noise
traveling wave tube
electrostatic potential well
particle-in-cell
