摘要
通过螺旋波纹波导的耦合波方程,考虑到波的左右旋转方向及波的前向和反向等因素,给出了波导中可能存在的所有模式,由耦合方程的特点和布拉格条件分析了各模式之间的关系,给出对应于螺旋波纹波导回旋行波管和螺旋波纹波导回旋返波管的模式耦合特点,并给出耦合关系和波导的模式耦合规则。结合螺旋波纹波导的色散方程,讨论了不同波纹周期和波纹起伏程度对模式耦合的影响:波纹周期的增大,使得电子注的加速电压变大;如果波纹周期太小,则工作模式线性变得很差。阐述了螺旋波纹波导回旋行波管克服模式竞争的机理。纹起伏程度较大,工作模式和非工作模式分离程度变大,对克服模式竞争比较有利。
Considering the factors such as the left or right turning directions of wave, the wave being forward or backward, all the possible modes in helical wave guide are given by using the coupling wave equations of helical wave guide. The relationships among all the possible modes are analyzed according to the characteristics of coupling wave equations and Blagg conditions, the mode coupling characteristics of traveling wave tube and backward wave tube with the helical corrugation are given correspondingly. The corresponding coupling relationships and the rules of mode coupling are obtained. Combined with the dispersion equations of helical wave guide, the effects of the helical corrugation period and corrugation fluctuation degree on mode coupling arc discussed that with the period increase of the helical corrugation, the accelerating voltage of electron beam increases, too. If the period of helical corrugation is too small, the linearity of operating mode becomes very poor. The mechanism of suppressing mode competition in gyrotron traveling wave tube amplifier with helical corrugation is illuminated. With bigger corrugation fluctuation degree, the separation between operating mode and non-operating modes is enhanced and it is very useful for suppressing mode competition.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2006年第11期1869-1872,共4页
High Power Laser and Particle Beams
基金
中国农业大学科研启动基金课题
大功率微波电真空器件技术国防科技重点实验室基金资助课题
关键词
螺旋波纹波导
布拉格条件
极化
模式耦合
模式竞争
Helical wave guide
Blagg conditions
Polarization
Mode coupling
Mode competition
