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《High Power Laser and Particle Beams》 2006-06
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Transmission characteristics for wave-guide with helical corrugation

WANG E-feng,LI Hong-fu,LI Hao,LIU Ying-hui,YU Sheng,NIU Xin-jina(Institute of High Energy Electronics,University of Electronic Science and Technology of China,Chengdu 610054,China)  
According to the general coupled-wave equations of wave-guide with helical corrugation,selecting the import-mode TE_(11),the coupled mode TE_(21) is gained.Based on the rules of mode coupling in helical wave-guide the determinate formula for coupling equation is obtained and analyzed.Using the iterative method can simplify the coupling equation.At the same time,analyzing the result can give the impact of transmission characteristics by the periods of helical wave-guide.The analytic formula of simplied coupling equation is employed to operate the rate of amplications in the work mode of helical wave-guide.The result indicates that the hybrid mode can be given within work frequencies,in which the main mode is TE_(21).The value of group velocity of hybrid mode is a constant number.And the band will be wide,when it interacts with beam.All of the analysis gives the evidence of beam-wave interaction.
【Fund】: 大功率微波电真空器件技术国防重点实验室基金资助课题;; 电子科技大学青年基金资助课题
【CateGory Index】: TN814
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