螺旋波纹波导模式分析
Mode analysis of helical wave guide
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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。Abstract: 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 are discussed that with the period increase of
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Key words:
- helical wave guide /
- blagg conditions /
- polarization /
- mode coupling /
- mode competition
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