【摘要】 本文针对"1.2 MeV/10 mA高频高压型电子加速器及束线"项目中钨丝阴极热发射电子枪的控制需求,在了解了系统组成和工作原理的基础上,采用三极式平板热阴极发射电子枪,阴极材料使用钨丝,灯丝加热电源由发电机供电,引出电压从加速管电极分压获得。通过设计一种基于可编程逻辑控制器(Programmable Logic Controller,PLC)的控制系统,实现了电子枪引出1μA～50 mA 4个数量级范围的直流电子束。该控制系统采用PLC作为设备控制器,LabVIEW软件作为用户界面,通过通信协议(Object Linking and Embedding for Process Control,OPC)接口实现控制软件与设备控制器的通讯。实验测试表明,系统具有可靠稳定、灵活高效等特点。更多还原

【Abstract】 [Background] Tungsten wire cathode thermal emission electron gun is adopted for the high frequency and high voltage electron accelerator and beamline project, but no commercial control system is available for this kind of electronic gun. [Purpose] This study aims to design and implement the control system of the Tungsten cathode thermal radiation electron gun for "1.2 MeV/10 mA high frequency and high voltage electron accelerator and beam line" project. [Methods] Based on understanding the composition and working principle of the system, the tripole flat-plate thermal cathode was employed in the electron gun that adopted tungsten wire as the cathode material. The filament heating power was supplied by the generator, and the extraction voltage was obtained by the partial voltage of the accelerating tube electrode. Its control system was designed and implemented by using programmable logic controller(PLC) while the general software LabVIEW was used in the host computer, and communication between host computer and PLC was achieved via the Object Linking and Embedding for process control(OPC) interface. [Results] Experimental results showed that the direct current electron beam in the range of 1 μA～50 m A was produced from this designed electron gun which could be controlled by the host computer.[Conclusion] As a device controller in the control system, the PLC together with LabVIEW programming in host computer can achieve reliable, flexible and efficient control of electron gun through OPC) interface.更多还原