【摘要】 介绍了十字斜扫描两维探测器的工作原理和基本构造,两根相互垂直的钨丝倾斜扫描同步辐射光束,一维运动同时得到垂直和水平的两维光电流密度分布,直接读出束斑中心位置坐标。并利用该探测器对国家同步辐射实验室同步辐射光源的扭摆器光源进行在线监测,得到了光电流密度分布曲线、束斑中心坐标、光束位置随辐射衰减和不同注入发生改变等一系列实测数据,为分析光源的稳定性能、校正束团轨道和准直光束线上的光学元件提供依据。更多还原

【Abstract】 In this paper,we describe the principles and structure of the beam position monitor(BPM),which is composed with two thin tungsten wires perpendicular to each other.A linear motion forming 45 ° with respect to horizontal scans simultaneously two wires across the beam spot to measure both photoemission currents as function of the position.The BPM has been mounted on the XAFS beamline at NSRL to monitor the synchrotron radiation stability from the Wiggler,including the photocurrents distribution in vertical and horizontal directions and drifts of the beam spot as attenuation of the electronic beam in different injections.It is useful in improving operation of the storage ring and collimating optical elements of the beamline.更多还原