合肥光源束测系统的最新研究进展  

Recent research advances of beam diagnostic system for HLS

作　　者：孙葆根[1] 曹涌[1] 李吉浩[1] 林顺富[1] 卢平[1] 王筠华[1] 罗箐[1] 王宝云[1] 

机构地区：[1]中国科学技术大学国家同步辐射实验室,安徽合肥230029

出　　处：《中国科学技术大学学报》2007年第4期475-482,共8页JUSTC

基　　金：国家自然科学基金(10675118;10275062);中国科学院知识创新工程基金(KY4206);"985工程"(173123200402002)资助

摘　　要：介绍了合肥光源束测系统的最新进展及其研究工作,包括200MeV直线加速器BPM系统的研制和测量,利用交流K调制的基于束流准直测量研究,基于对数比处理技术的同步光位置测量系统的研制以及数字束流位置处理器的应用研究.直线加速器BPM系统已安装,并做了在线的束流位置测量实验,给出了测量结果.在合肥光源储存环上利用双向固态继电器开关可以对32块四极铁进行交流K调制,采用数字锁相放大和插值快速傅立叶分析算法进行了基于束流准直的交流K调制测量实验和研究,给出了实验结果.利用高精度对数运算放大器LOG112研制了基于对数比处理技术的同步光位置测量系统,其性能优于常用的差比和处理技术.利用数字束流位置处理器Libera在合肥光源储存环上完成了工作点、相空间和横向振荡阻尼时间常数等的测量,并取得了很好的结果.The recent research advances of the beam diagnostic system for HLS （Hefei light source） were introduced, which include the design and measurement of the beam position monitor （BPM） system at HLS linac, design of the photon BPM signal processing system with the logarithmic ratio method, study of the beam-based alignment technology using AC K-modulation, and application of digital beam position processor Libera on beam diagnostics. The BPM system newly designed at HLS linac has been installed and applied in beam-based experiments, and the results of the experiments were given. A new beam-based alignment （BBA） measurement system with AC K-modulation module was developed recently at HLS, which equips the quadrupole magnets on the storage ring with a current shunt system that is able to vary the magnet current of a given quadrupole at a given frequency. Amplitude estimate algorithms of software lock-in amplifier and interpolated FFT were discussed. The BPM-to-quadrupole offset measurement precision is about 20μm. A photon BPM signal processing system with the logarithmic ratio method was designed for a two-wire monitor in the machine diagnostic beamline （MDBL）, which has a good performance price ratio. The beam parameters（tune, phase space and damping time） were measured by Libera and some results were also given.

关 键 词：束流位置探测器 基于束流准直 交流K调制 对数比处理技术 光位置监控器 数字束流 位置处理器 

分 类 号：TL506[核科学技术—核技术及应用]