电离型截面探测器研究

针对强流质子加速器非拦截式的截面测量需求,开展了以剩余气体分子为基础的电离型截面探测器的研究工作。探索了电离信号强度的计算方法,利用CST(Computer Simulation Technology)电磁工作室对电场进行了优化设计,设计加工了一套应用于质子直线加速器的电离型截面探测器,该装置利用高压电极产生的电场引导电离产物,用微通道板放大电离信号,荧光屏和相机组成探测系统。该电离型截面探测器被安装于加速器驱动次临界系统(China Accelerator Driven Subcritical system,ADS)先导专项的注入器I上,在线束流实验证明,该套设备工作稳定正常,实现了束流截面的非拦截式测量。

Study on ionization profile monitor

Background: Beam profile determination at high intensity hadron accelerators implies the usage of non-invasive methods.Purpose:This study aims to develop the profile measurement technology for high intensity proton accelerator.Methods:The transverse profile of the beam was monitoredvia detecting the ionization products produced by the collision of proton with residual gas in the vacuum pipe. High-voltage electrodes were used for producing electrical field to guide ionized offspring whilst microchannel plates (MCP) was employed to amplify the signal. The screen and charge-coupled device (CCD) system were used for position detection.Results&Conclusion: An ionization profile monitor is designed and manufactured, which has been installed on the China accelerator driven subcritical system (ADS) injector I. The signal intensity of ionization products matches the theory's expectation. Experiments result shows that it is a useful tool to measure the profile of proton beam.