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北京大学自主研制了基于射频四极(Radio Frequency Quadrupole,RFQ)强流氘束加速器。为满足该加速器稳定运行的要求,设计了一套低电平控制系统,系统主要包含自动增益控制(Automatic Gain Control,AGC)和自动频率控制(Automatic Frequency Control,AFC)两种方式,可实现对腔体频率、进腔功率的自动控制和手动控制。为保证安全、稳定运行,对SWR(Standing Wave Ratio)、限位信号进行监测,通过RS232协议和Lab VIEW界面实现HMI(Human Machine Interface),亦可实现与PLC(Programmable Logic Controller)的无缝对接。连续闭环运行表明,控制系统对场幅度和相位的控制精度能够达到±1%和±1°之内,证明该低电平控制系统达到了RFQ加速器对各路功率和腔体频率稳定控制的要求。
Peking University independently developed a radio-frequency quadrupole (RFQ) high-current deuterium beam accelerator. In order to meet the requirements of stable operation of the accelerator, a low-level control system is designed. The system mainly includes Automatic Gain Control (AGC) and Automatic Frequency Control (AFC) Cavity frequency, cavity power automatic control and manual control. In order to ensure safety and stable operation, we monitor Standing Wave Ratio (SWR) and limit signal, implement Human Machine Interface (HMI) through RS232 protocol and Lab VIEW, and seamlessly connect with PLC (Programmable Logic Controller) . The continuous closed-loop operation shows that the control system can control the field amplitude and phase accurately within ± 1% and within ± 1 °, which proves that the low-level control system meets the requirements of RFQ accelerator for stable control of power and cavity frequency .