New beam intensity measurement system for HLSⅡ injector
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摘要: 合肥光源升级改造任务已基本完成，注入器实现满能量注入。为适应新的注入器束流强度的测量需求，设计了新的注入器束流强度测量系统，该系统利用安装在真空腔上的3个快速束流变压器(FCT)和2个积分束流变压器(ICT)，能够实现束流流强和电荷量的非拦截实时测量。为了准确获取束流参数，首先对束流变压器(CT)传输电缆进行了在线和离线标定；由于 ICT输出信号信号幅度较小，噪声大，设计了低噪声前置放大器以改善信噪比；考虑低频谐波噪声和Kicker噪声的干扰，软件中通过适当的算法对噪声进行了处理；最后给出了部分在线实验结果。实验结果表明，束流传输效率约为27.4%，注入效率约为44.3%。Abstract: The upgrade project of HLSⅡ is almost finished and the new injector has achieved the goal of full energy injection. To satisfy the need of measuring the new injector beam intensity, a beam intensity measurement (BIM) system is designed, which has 3 fast current transformers (FCT) and 2 integrating current transformers (ICT) installed in the vacuum chamber to non-destructively and real-timely measure beam current and beam charge. To acquire beam parameters accurately, the article elaborates the on-line and off-line calibration method of long transmission coaxial cable. Then two low noise pre-amplifiers used to amplify the output signal of ICT to improve SNR are designed and appropriate algorithms of reducing the low frequency harmonic noise and kicker noise in software are proposed. In the end, some on-line experiment results are presented, which show that beam transmission efficiency is about 27.4% and injection efficiency is approximately 44.3%.
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Key words:
- injector /
- current transformer /
- macro pulse width /
- beam peak current /
- beam charge
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