The paper introduces some of the recent developments in beam diagnostics,which include the beam position measurement techniques with sub-micrometer resolution,the beam size measurement techniques with sub-micrometer resolution,and the bunch length measurement techniques with sub-picosecond resolution.The cavity beam position monitor and the digital BPM signal processing technique are introduced for the beam position measurement techniques. The laser wire beam profile monitor,and the optical transition radiation/optical diffraction radiation beam size monitor are introduced for the beam size measurement techniques.The spectral techniques of coherent radiation,the transverse deflecting cavity,the rf zero-phasing technique,and the electro-optic techniques are introduced for the bunch length measurement techniques.
对合肥光源(HLS)直线加速器(LINAC)的束流位置测量系统进行改造,设计并加工了非拦截型、高精度的条带电极束流位置检测器(Beam Position Monitor,BPM)。安装前,通过定位精度小于5μm的电控位移平台,采用具有更大动态范围和线性度的对数比而非传统的差和比的处理方法,对条带束流位置检测器进行标定。本文介绍了标定平台、对数比处理系统以及自动控制标定程序,给出了基于对数比方法的标定结果。该条带电极束流位置检测器的水平方向和垂直方向的灵敏度分别为1.55 dB/mm和1.48 dB/mm,束流位置分辨率为42μm,电中心相对于机械中心的偏差为(0.212,0.450)mm。
