设计了一种改进型射频功率源输出功率控制系统,解决了现有射频功率源使用中存在的输出功率稳定性与控制精度不足等问题,预期将应用于中国聚变工程实验堆(China Fusion Engineering Test Reactor,CFETR)负离子源中性束系统(Negative Ion ...设计了一种改进型射频功率源输出功率控制系统,解决了现有射频功率源使用中存在的输出功率稳定性与控制精度不足等问题,预期将应用于中国聚变工程实验堆(China Fusion Engineering Test Reactor,CFETR)负离子源中性束系统(Negative Ion Based Neutral Beam Injection System,NNBI)。采用ARM+CPLD双核设计的软、硬件分离控制结构,保障输出功率控制算法运行效率;采用数字化信号控制方法,实现输出功率的高精度控制;通过精确采样射频功率源实际输出功率和闭环功率控制方法设计,实现输出功率的高稳定性控制。对射频功率源样机进行输出功率控制系统模拟负载测试,结果表明:在额定输出功率为50 kW时,输出功率的控制精度高于0.1%、稳定性波动小于0.5%、人机交互软件功能完善。该方案预期可以搭配阻抗匹配网络满足CFETR NNBI射频功率源对输出功率控制的性能要求。展开更多
The low level radio frequency(LLRF) system for booster accelerator at Shanghai Synchrotron Radiation Facility(SSRF) was upgraded by a digital controller based on field programmable gate array(FPGA) technology.Paramete...The low level radio frequency(LLRF) system for booster accelerator at Shanghai Synchrotron Radiation Facility(SSRF) was upgraded by a digital controller based on field programmable gate array(FPGA) technology.Parameters of voltage, frequency and field flatness in the two 5-cell cavities are controlled to meet the requirements of booster. In this article, the ramping curve of cavity voltage, amplitude and phase control loop with vector sum of the two 5-cell cavities, tuning loop and field flatness loop are analyzed and discussed in detail.A different method in tuning loop is adopted due to the limitations of ADC channels. The function realizes energy ramping of electron beam from 150 Me V to 3.5 Ge V with a repetition rate of 2 Hz. With the new LLRF controller, the phase stability at ramping mode in 10 hours long operation is improved from ±1.5°(RMS) with open loop to ±0.15°(RMS) with close loop, while the detuning phase and field flatness are maintained to within ±2°and ±1%, respectively.展开更多
文摘设计了一种改进型射频功率源输出功率控制系统,解决了现有射频功率源使用中存在的输出功率稳定性与控制精度不足等问题,预期将应用于中国聚变工程实验堆(China Fusion Engineering Test Reactor,CFETR)负离子源中性束系统(Negative Ion Based Neutral Beam Injection System,NNBI)。采用ARM+CPLD双核设计的软、硬件分离控制结构,保障输出功率控制算法运行效率;采用数字化信号控制方法,实现输出功率的高精度控制;通过精确采样射频功率源实际输出功率和闭环功率控制方法设计,实现输出功率的高稳定性控制。对射频功率源样机进行输出功率控制系统模拟负载测试,结果表明:在额定输出功率为50 kW时,输出功率的控制精度高于0.1%、稳定性波动小于0.5%、人机交互软件功能完善。该方案预期可以搭配阻抗匹配网络满足CFETR NNBI射频功率源对输出功率控制的性能要求。
基金Supported by the National Natural Science Foundation of China(No.11335014)
文摘The low level radio frequency(LLRF) system for booster accelerator at Shanghai Synchrotron Radiation Facility(SSRF) was upgraded by a digital controller based on field programmable gate array(FPGA) technology.Parameters of voltage, frequency and field flatness in the two 5-cell cavities are controlled to meet the requirements of booster. In this article, the ramping curve of cavity voltage, amplitude and phase control loop with vector sum of the two 5-cell cavities, tuning loop and field flatness loop are analyzed and discussed in detail.A different method in tuning loop is adopted due to the limitations of ADC channels. The function realizes energy ramping of electron beam from 150 Me V to 3.5 Ge V with a repetition rate of 2 Hz. With the new LLRF controller, the phase stability at ramping mode in 10 hours long operation is improved from ±1.5°(RMS) with open loop to ±0.15°(RMS) with close loop, while the detuning phase and field flatness are maintained to within ±2°and ±1%, respectively.
