在线同位素分离器束测装置中弱电流测量系统

Weak current measurement system in BRISOL

在线同位素分离器是串列升级工程项目实验装置之一,弱电流测量是该装置中束流诊断系统的关键技术。详细介绍了该装置中弱束流测量系统的组成、弱电流测量的难点和放大器方案确定,分析了影响弱电流测量的诸多因素以及在制作弱电流放大器时应注意的一些设计问题,提出了相应的解决方法。该弱电流测量系统在各种苛刻环境下进行多次实验,弱电流放大器的抗干扰能力和可靠性得以验证,性能指标满足该装置束流诊断系统的要求。

Background： The Beijing Radioactive Isotope Separator Online （BRISOL） is one of the important experimental equipment in the improving project of Tandem accelerator. Its performance is heavily affected by the stability of the weak current measurement system. Purpose： The aim is to develop a robust weak current amplifier for the low level measurement system of BRISOL. Methods： Aider analyses of the composition and the difficulties of weak beam measurement system in BRISOL, effectual measures were taken to design the weak current amplifier. Many factors that may influence the low current measurement and some design problems were paid special attention to the implementation of this weak current amplifier by using specific design software for circuit layout, programmable logic controllor （PLC） for baseline drift correction, etc. Results： Considerable experimental tests were carried out in a variety of harsh environments for the weak current measurement system in BRISOL, and promising results were achieved. Conclusion： The anti-interference ability and reliability of the weak current amplifier were verified. The performance of the weak current measurement system can meet the requirements of beam diagnostic system.