Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application

作     者：Qi Chen Zheng Gao Zheng-Long Zhu Zong-Heng Xue Yuan He Xian-Wu Wang Qi Chen;Zheng Gao;Zheng-Long Zhu;Zong-Heng Xue;Yuan He;Xian-Wu Wang

作者机构：Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2020年第31卷第3期

页      面：66-73页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

基　　金：supported by Lawrence Doolittle,Gang Huang,Derun Li,and John Byrd from LBNL benefited from Lawrence Doolittle’s and Gang Huang’s valuable comments and suggestions on the design 

主　　题：Frequency jump RF Front-end LLRF CiADS 

摘      要：The China initiative Accelerator Driven System,CiADS,physics design adopts 162.5 MHz,325 MHz,and 650 MHz cavities,which are driven by the corresponding radio frequency(RF)power system,requiring frequency translation front-end for the RF *** that application,a general-purpose design front-end prototype has been developed to evaluate the multi-frequency point supported design *** difficult parts to achieve the requirements of the general-purpose design are reasonable device selection and balanced *** a carefully selected low-noise wide-band RF mixer and amplifier to balance the performance of multi-frequency supported down-conversion,specially designed LO distribution net to increase isolation between adjacent channels,and external band-pass filter to realize expected up-conversion frequencies,high maintenance and modular front-end generalpurpose design has been *** of standard parameters show an R2 value of at least 99.991%in the range of-60-10 dBm for linearity,up to 18 dBm for P1dB,and up to 89 dBc for cross talk between adjacent *** phase noise spectrum is lower than 80 dBc in the range of 0-1 MHz;cumulative phase noise is 0.006°;and amplitude and phase stability are 0.022%and 0.034°,respectively.