Study on gradually-varying cavity for a gyrotron

Lei Chao-Jun, Yu Sheng, Li Hong-Fu, Niu Xin-Jian, Liu Ying-Hui, Hou Shen-Yong, Zhang Tian-Zhong
2012 Wuli xuebao  
The mode competition is the problem to be solved urgently in high-order mode gyrotron. Based on the generalized theory of transmission line, a group of first order transmission line equations that can accurately describe the coupling modes in a graduallyvarying cavity is studied. Through analysing the expressions of the coupling coefficients between the various modes, a gradual-varying cavity for a gyrotron is designed. It is proved that the power in spurious modes in this novel cavity may be
more » ... pt far below that in the line-joint cavity. The normalized amplitudes of non-operating modes can reach −100 dB in cavity and −88.6 dB in travelling wave guide.
doi:10.7498/aps.61.180202 fatcat:jk2mwn46jrbfjabjyip3zi3z2q