HL-2A装置直流辉光自动调节控制系统

直流辉光放电清洗的主要作用是去除HL-2A装置内的低Z杂质C、O,以及放电期间所产生的残余气体和杂质。介绍了直流辉光放电自动调节控制系统。在辉光放电过程中,实现了真空室工作气体气压和放电电压的自动调节和信号采集。本文描述了系统的设计原理,控制方案和系统实现后的具体应用效果。直流辉光放电系统的性能得到了提高,放电电流稳定性得到了显著提高,放电电压的控制精度改善为1%FS,系统从启动到稳定运行状态的时间小于40 s,HL-2A装置的清洗效率也明显获得改善。

Novel Controller for DC Glow Discharge Cleaning of Chamber Walls in HL-2A Tokomak Fusion-Test-Reactor

A novel controller was developed and used in DC glow discharge cleaning to remove fusion fuels,low-Z impurities and residual gases adsorbed on chamber walls in HL-2 A Tokomak Fusion-Test-Reactor.The discussions focused on: i) the design principles,control algorithms and construction and adjustment;iii)the control objectives and requirements,including the flow-rate/pressure of fusion fuel and waveform/stability of DC discharge voltage;iii) the tested and evaluated results. The lab-built controller has been installed,field tested for over 2500 h in HL-2 A Tokomak.The results show that the novel controller makes the difference.To be specific,it significantly increased the discharge current stability by controlling the discharge voltage with an accuracy better than1%FS and shortened the manually stabilizing time of the discharge voltage from 90 s to less than 40 s.Most importantly,it considerably improved the cleanliness of HL-2 A Tokomak reactor.