【作者】 邹俊颖；

【导师】 孙葆根； 杨永良；

【作者基本信息】 中国科学技术大学 ， 核技术及应用， 2014， 博士

【摘要】 束流位置测量系统是加速器束流测量系统的重要组成部分。束流位置检测器(BPM)可用于束流位置的非拦截测量,而基于其组成的注入器束流位置测量系统可以实现注入器束流位置、流强的实时在线测量,为注入器束流诊断提供重要手段,提高注入器束流质量和注入效率。本论文为合肥光源重大维修改造项目(HLSII)注入器研制了一套基于条带BPM的束流位置测量系统,为HLSII的调试和运行提供了重要的诊断手段。本文首先介绍了与条带束流位置检测器相关的束流测量理论。从条带电极的感应信号开始,由浅入深的介绍了束流位置测量、束流流强测量、束流能散测量等基于条带束流位置检测器的相关理论,分析了电极耦合效应对这些测量的影响。介绍了由电极感应信号得到束流位置常用的不同方法,并简要介绍了BPM电子学系统中需要用到的信号的频域处理相关理论。针对HLSII注入器对束流位置测量系统的要求,对条带BPM主要的性能参数进行了模拟计算。利用边界元法对束流位置测量的灵敏度、Mapping图的拟合公式、和信号、电极增益系数的影响等进行了模拟计算；在微波工作室(CST)软件中对条带BPM进行了仿真计算,得到了电极耦合效应对各测量参数的影响；在加工完成后搭建了全自动化的标定平台对条带BPM进行了离线标定,标定结果显示各测量参数与模拟结果非常接近。对HLSII注入器束流位置测量系统的信号采集与处理部分进行了介绍。在硬件方面,我们对各部分进行了一系列测试：对电子学系统Libera Brilliance Single Pass进行了详细的性能与离线分辨率测试；对其通道不一致性做了细致的标定；对系统的传输线缆做了性能测试。测试结果显示系统各硬件部分状态良好,满足HLSII注入器束流位置测量系统的要求。在软件方面,开发了一个基于CSS BOY的综合运用OPI程序,对其进行了离线测试。测试结果显示该程序能长时间稳定的运行。最后我们在合肥光源(HLS)及其重大维修改造工程(HLSII)的注入器上开展了一些相关的实验研究。首先在HLS及HLSII注入器上分别进行了束流位置的测量,HLS上的测量结果显示电子学系统Libera Brilliance Single Pass的性能优于已有的对数比系统,HLSII上的测量结果显示位置分辨率达到设计要求。其次在HLSII注入器上对系统做了基于束流的标定,最后做了在线电极增益系数标定与和信号和能散的测量。本课题由国家自然科学基金项目(11175173,11375178,11105141)与合肥光源重大维修改造项目支持。更多还原

【Abstract】 Beam position measurement system is an important subsystem for the accelerator beam measurement system. Strip-line Beam Position Monitor (BPM) can be used for non-intercepting beam position measurement. Due to this fact, it is feasible to measure online beam position and current in real-time, and this is advantageous to improve the beam quality of the injector and injection efficiency. A beam position measurement system based on Strip-line BPM and digital beam position processor is developed for the upgraded Hefei Light Source (HLSII) injector as a reliable diagnostic tool for the commissioning and operation of HLSII injector.Firstly, the concerning theory relative to stripline beam position monitor is introduced. The signal of the stripline pick-up induced by the beam is introduced. Informations about beam position, current and energy spread can be extracted with different treatment to the induced signal of the four electodes. Also, the coupling effect of electrodes on these measurements is analyzed. We describe the different signal treatments for beam position measurement based on the electrode signals. The related theory of signal processing in frequency domain is also briefly described.In order to meet the demand of the HLSII injector BPM system, main parameters of stripline BPM are simulated and calculated. Using the boundary element method, we simulate the BPM sensitivity, fitting formula for Mapping, sum signal and gain coefficient of the electrode, etc. By simulating the stripline BPM in Microwave Studio (CST), the effects of electrode coupling on each measured parameter are estimated. The stripline BPMs’ parameters are calibrated in a full-automatic off-line calibration platform. Results show that the measured parameters are in agreement with simulation results.The signal acquisition and processing of HLSII injector beam position measurement system is introduced. A series tests are made on the hardware:the performance and off-line resolution of the Libera Brilliance Single Pass; the inconsistency for the four channels of Libera Brilliance Single Pass; the performance of cable. Test results show that the performance of all the hardware are satisfied for the beam position measurement of the HLSII injector. An integral operator interface is developed based on the CSS_BOY and fullly tested. Results show that the program is sufficient stability for continuous running.At last, related experimental researches on HLS injector and HLSII injector are respcetively done. The results of beam position measurement for the HLS injector show that the perfomence of Libera Brilliance Single Pass is better than the exsiting system. Results of HLSII injector shows that the system meet the design requirements. Moreover, beam-based calibration and gain coefficient calibration of the electrodes based on the BPM system on the HLSII injector are made respectively. In finally, the SUM signal and energy spread of the online beam are measured.Investigation of this subject is supported by National Natural Science Foundation project11175173,11375178,11105141, and the HLS major maintenance and reconstruction project.更多还原