强流RFQ的固态功率源模块故障分析（英文）

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英文篇名：Analysis of modules failure in solid-state amplifier for high current RFQ 作者：孙列鹏 ; 袁震宇 ; 张诚 ; 施龙波 ; 苗俊刚 ; 张建华 ; 徐显波 ; 何源 英文作者：Sun Liepeng;Yuan Zhenyu;Zhang Cheng;Shi Longbo;Miao Jungang;Zhang Jianhua;Xu Xianbo;He Yuan;Beijing Broadcast Equipment Factory Science & Technology Co,Ltd;Institute of Modern Physics,Chinese Academy of Sciences;Beihang University; 关键词：固态功率源 ; 电长度 ; 合成器 ; 吸收负载 ; 环形器 英文关键词：solid-state amplifier;;electrical length;;combiner;;sink load;;circulator 中文刊名：QJGY 英文刊名：High Power Laser and Particle Beams 机构：北京北广科技股份有限公司;中国科学院近代物理研究所;北京航天航空大学; 出版日期：2019-06-04 10:06 出版单位：强激光与粒子束 年：2019 期：v.31;No.264 基金：Strategic Priority Research Program of Chinese Academy of Sciences(XDA030205) 语种：英文; 页：QJGY201906018 页数：6 CN：06 ISSN：51-1311/O4 分类号：107-112

摘要

用于中科院近代物理研究所的ADS项目中的射频四极加速器(RFQ)的新RF系统在2017年初升级,原来的电子四极放大器被两个新的固态功放(SSA)所替换,它们是两台相同的额定功率为80kW的功率源,通过两个相同的耦合器在腔内合成至少100kW的功率。但是对于SSA来说,为了功率组合,太多的功率模块的振幅和相位进行了调整和优化,一个或几个损坏的环形器(包括吸收负载)可能导致整个射频系统的失效。特别是,根据实验和仿真,发生失配问题后,如果两级合成器之间的传输线电长度满足某一特定条件时,系统的散射参数会有很大的波动,甚至切断。详细介绍了北京北广科技股份有限公司用于模拟多级合成放大的模拟方法、放大链路的故障分析及相关实验情况。
        The new RF system of Radio Frequency Quadrupole(RFQ)accelerator in ADS project at the Institute of Modern Physics(IMP)was upgraded in the beginning of 2017,the original tetrode amplifier was replaced by two new unconditionally stable solid-state amplifiers(SSAs)for proton acceleration,which have the same 80 kW nominal power and combine at least 120 kW inside the cavity with two uniform couplers.In the SSAs,the multiple power modules were amplitude-modulated and phase-optimized for power combination,but one or a couple of damaged circulators(including sink loads)might cause failure of the whole RF system.Especially,according to experiments and simulation,when the transmission line between the two different level combiners met a specific condition,the scattering parameter of the system would have great fluctuations,even cut-off,if damages occurred in circulators or sink loads.In this paper,the simulation methods for multi-level synthetic amplifying are introduced in detail;as a new design concept of the amplifier,the failure analysis and related experiments focusing on amplification links of SSA under special circumstances are also presented.

引文

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