The PaPer presents the design of the two-stage depressed collector system for 35GHz gyrotron, taking into account the effect of secondary electrons. Employed a new 2.5-D computer-aided design codes named CHAELOPS, including the auto-gridding generator, the electromagnetic solver, the accurate particle trajectory tracer and the secondary electron emitter including true secondary and backscattered seondary electron models based on Monte-Carlo method. The codes take into account either the safety and the reliability. The user interface is very friendly and fiexible. The collector electrode potentials were optimized in order to maximize the efliciency of the collector system s and minimize the effect of the secondary electrons. The primary beams come from the beam-wave interaction simulation codes. When the potentials were-20kV and -35kV, the magnetic com press ratio was 5.38, the better collector efliciency was 60.0％ with all the secondary electrons landing on the same electrode. The normalized velocity distribution of one trajectory in phase-space was shown in the paper, indicated the theory of the energy conversion of the electrons in retarding electric field and adiabatic magnetic field. The results comparison between EGUN and CHAELOPS has been made and good agreements have been obtained.

研究了具有突变结构复合腔回旋管注2波互作用自洽非线性理论. 用场匹配方法处理了腔中的突变结构,从具有电子流源的普遍传输线方程出发,研究了腔中注2波互作用非线性理论,在腔直径渐变部分考虑了模式之间的耦合. 利用此非线性理论模型,对突变结构复合腔三次谐波回旋管中电子流与H511 —H521模式对的高频场互作用进行了详细数值模拟,得出了许多有价值的结果. 计算结果表明,在合适的腔体结构尺寸下,注波互作用效率可大于25%.

利用含电流的传输线方程,在考虑多模与电子注互作用及多模耦合的情况下,对三次谐波渐变复合腔回旋管进行了非线性模拟,计算了H51-H52模式下三次谐波注波互作用,分析了多模对注-波互作用的影响.