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This paper describes a low level radio frequency control system that was developed by the Institute of Modern Physics Chinese Academy of Sciences, and will be used in Injector of the China-ADS project. The LLRF control system consists of an RF modulated front end, fast analog-to-digital converter (ADC) modules, and a digital signal processing board based on a field programmable gate array. The system has been tested on a room temperature cavity with 12-hr, and the results illustrate that the stability of amplitude and phase achieved ±0.32% and ±0.35 degrees, respectively. 相似文献
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李春龙 《数学的实践与认识》2012,42(19)
设n≥2,n∈N,β>θ>0,a∈R_+~n,r∈R,M_r(a)为a的r次幂平均,将确定参数λ,使(G(a))~(1-λ)(Mβ(a))~λ≤M_θ(a)成立.此结果推广了一些已知结论. 相似文献
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在各地2012年高考复习备考的模拟试题中,出现了大量新颖题,本文精选部分试题,供大家参考.题1(河南省豫南九校2011-2012学年高三上学期第一次联考)2011年深圳大运会,某运动 相似文献
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研究了皇冠Qn的调和性,给出了一个相关结果,即证实了从皇冠Qn中去掉一条悬挂边而得到的缺叶皇冠-Qn的调和性. 相似文献
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功率耦合器是粒子加速腔射频功率馈送的关键部件。耦合器在安装至加速腔之前,必须进行常温高功率测试和锻炼,以检验加工工艺和设计指标,提高其射频性能。详细介绍了中国科学院近代物理研究所ADS25 MeV加速器样机162.5 MHz耦合器测试平台的改进设计。针对原有接触式测试锻炼方式的不足,提出非接触式测试锻炼方案。对耦合器测试锻炼过程进行了物理抽象,采用理论模拟的方法分析测试腔体功率传输。基于分析结果设计了低损耗、宽通带、多用途的非接触式耦合器测试腔体。该腔体可实现20 kW测试功率下60 W左右的腔体损耗和15 MHz-3 dB带宽。Fundamental power couplers (FPC) are crucial components for feeding RF power to the accelerating cavities. Before being installed on the accelerating cavity, a coupler must be tested and conditioned at room temperature to check its fabrication quality, to verify its design specifications, and improve its RF performance. This paper thoroughly introduced the design of a test stand for the 162.5 MHz coupler of ADS 25 MeV demo facility at IMP, CAS. In order to overcome the shortcomings of the original contacting test method, a noncontacting test scheme was proposed. A physical model was built for the the coupler test and the test cavity power transmission was analyzed theoretically. Based on the analysis results, a low-loss, wide-passband and multipurpose non-contacting coupler test cavity was designed. With the new test cavity, a power loss of around 60W and a -3 dB bandwidth of 15 MHz at a test power of 20 kW was achieved. 相似文献
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