盘荷波导栏片圆弧对频率和尾场的影响

摘要

The effects of the round edge beam hole on the frequency and wake field are studied using variationalmethod, which allows for rounded iris disk hole without any approximation in shape treatment. The frequencies andwakefields of accelerating mode and dipole mode are studied for different edge radius cases, including the flat edge shapethat is often used to approximately represent the actual structure geometry. The edge hole shape has weak effect on thefrequency, but strong effect on the wakefield. The study shows that the amounts of wakefields are not precise enoughwith the assumption of the flat edge beam hole as of round edge. The shape assumption brings loss factor 15 % err for the most dangerous EH1s mode.%利用变分法详尽地研究了X-波段盘荷波导中栏片圆弧对频率和尾场的影响，比较了不同栏片形状下加速模和横向模的频率与尾场。研究表明栏片形状对频率的影响较小，但对尾场的影响较大.在圆弧栏片和直边栏片两种情形下，最危险EH16模的尾场相差超过15％，因此栏片圆弧的作用是不能忽略的。