CAJ | 학술논문

针对北京正负电子对撞机二期工程(BEPCⅡ)在高流强下运行经常出现的突然丢束问题，研制了基于逐束团测量的丢束监测系统。束流位置探头(BPM)的四路电极信号作为监测系统的信号源，四路高速模数转换器(ADC)和现场可编程门阵列(FPGA)进行模拟信号的数字化和数字信号的处理。通过获取丢束前每个束团的位置和流强等信息来分析引起丢束的原因。结合加速器硬件情况，长时间对丢束监测系统数据的分析，以及设计的对比实验，深入研究丢束问题。系统对高频系统故障、束流不稳定性和磁铁电源系统不稳定等原因引起的丢束现象可以做出准确的判断，进而为加速器稳定运行提供优化方向。
침대북경정부전자대당궤이기공정(BEPCⅡ)재고류강하운행경상출현적돌연주속문제，연제료기우축속단측량적주속감측계통。속류위치탐두(BPM)적사로전겁신호작위감측계통적신호원，사로고속모수전환기(ADC)화현장가편정문진렬(FPGA)진행모의신호적수자화화수자신호적처리。통과획취주속전매개속단적위치화류강등신식래분석인기주속적원인。결합가속기경건정황，장시간대주속감측계통수거적분석，이급설계적대비실험，심입연구주속문제。계통대고빈계통고장、속류불은정성화자철전원계통불은정등원인인기적주속현상가이주출준학적판단，진이위가속기은정운행제공우화방향。
A new prototype system for bunch-by-bunch beam position measurement has been designed and built to monitor and analyse the beam loss in the Beijing Electron-Positron ColliderⅡ(BEPCⅡ)storage ring.The fast ADC is used to sample the analog signals from the beam position monitor,then the digital signal is processed further using programmable gate array (FP-GA).The beam information can be obtained by means of bunch-by-bunch,such as bunch position,bunch current and bunch tune.Based on system monitoring and data analysis for long terms,as well as the dedicated machine experiments,it’s relatively clear for operators to understand some trip events,especially the beam loss caused by the high-frequency cavity trip,tune drift and multiple bunch instability.The study proves that the system is very useful for the operation of accelerator.