Longitudinal beam halo measurement with an RF chopper system
Longitudinal beam halo measurement with an RF chopper system
复制标题
使用射频斩波器系统进行纵向光束光晕测量
DOI：
10.1016/j.nima.2013.06.046
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Ikegami
中科院分区：
文献类型：
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作者：
T. Maruta;M. Ikegami
在高强度直线加速器中，测量对微弱晕具有足够灵敏度的纵向束尾宽度具有重要的实际意义。在本文中，我们提出了一种新设计的方法诊断纵向束尾宽度利用射频斩波器系统和下游束流损失监测。我们已经在直线加速器上进行了演示实验，成功地证明了测量方法的可行性。束流损失监测器的灵敏度可以检测到10− 7量级的部分束流损失，这使我们能够检测到相应的高度纤细束尾的宽度。通过推广该方法，我们还可以推导出关于纵向梁剖面的信息。虽然饱和度校准是定量分析所必需的，但我们已经通过实验证实，该测量对于提供纵向束轮廓的定性图像是敏感的。
It is of practical importance in a high intensity linac to measure the longitudinal beam tail width with sufficient sensitivity to a tenuous halo. In this paper, we propose a newly devised method of diagnosing the longitudinal beam tail width utilizing an RF chopper system and a downstream beam loss monitor. We have conducted a demonstration experiment at a linac to successfully show the feasibility of the measurement method. The beam loss monitor has the sensitivity to detect the fractional beam loss in the order of 10− 7, which enables us to detect the width of the corresponding highly tenuous beam tail. We can also deduce the information on the longitudinal beam profile by extending the method. Although saturation calibration is required for a quantitative analysis, we have experimentally confirmed that the measurement is sensitive to provide a qualitative picture of the longitudinal beam profile.