介绍了麦克风效应和洛伦兹力作用对C-ADS注入器I的Spoke012超导腔的影响以及腔的压电陶瓷快调谐传递函数的特性,并详细叙述了依据传递函数特性搭建频率控制基本环路及利用阻尼技术来对腔的特定频率边带进行抑制的方法。所设计的PI控制...介绍了麦克风效应和洛伦兹力作用对C-ADS注入器I的Spoke012超导腔的影响以及腔的压电陶瓷快调谐传递函数的特性,并详细叙述了依据传递函数特性搭建频率控制基本环路及利用阻尼技术来对腔的特定频率边带进行抑制的方法。所设计的PI控制基本环路和特定频率边带抑制环路在实际运行中得到使用,前者有效抑制了低频振荡,后者抑制特定频率振荡幅度达到15 d B。展开更多
The spoke cavities mounted in the China Accelerator Driven sub-critical System（C-ADS） have high quality factor（Q） and very small bandwidth,making them very sensitive to mechanical perturbations,whether external or...The spoke cavities mounted in the China Accelerator Driven sub-critical System（C-ADS） have high quality factor（Q） and very small bandwidth,making them very sensitive to mechanical perturbations,whether external or self-induced.The transfer function is used to characterize the response of the cavity eigenfrequency to the perturbations.This paper describes a method to measure the transfer function of a spoke cavity.The measured Lorentz transfer function shows there are 206 Hz and 311 Hz mechanical eigenniodes excited by Lorentz force in the cavity of C-ADS,and the measured piezo fast tuner transfer function shows there are 12 mechanical eigenniodes from 0 to 500 Hz.According to these results,some effective measures have been taken to weaken the influence of helium pressure fluctuation,avoid mechanical resonances and improve the reliability of the RF system.展开更多
文摘介绍了麦克风效应和洛伦兹力作用对C-ADS注入器I的Spoke012超导腔的影响以及腔的压电陶瓷快调谐传递函数的特性,并详细叙述了依据传递函数特性搭建频率控制基本环路及利用阻尼技术来对腔的特定频率边带进行抑制的方法。所设计的PI控制基本环路和特定频率边带抑制环路在实际运行中得到使用,前者有效抑制了低频振荡,后者抑制特定频率振荡幅度达到15 d B。
基金Supported by Proton Linac accelerator I of China Accelerator Driven Sub-critical System(Y12C32W129)
文摘The spoke cavities mounted in the China Accelerator Driven sub-critical System（C-ADS） have high quality factor（Q） and very small bandwidth,making them very sensitive to mechanical perturbations,whether external or self-induced.The transfer function is used to characterize the response of the cavity eigenfrequency to the perturbations.This paper describes a method to measure the transfer function of a spoke cavity.The measured Lorentz transfer function shows there are 206 Hz and 311 Hz mechanical eigenniodes excited by Lorentz force in the cavity of C-ADS,and the measured piezo fast tuner transfer function shows there are 12 mechanical eigenniodes from 0 to 500 Hz.According to these results,some effective measures have been taken to weaken the influence of helium pressure fluctuation,avoid mechanical resonances and improve the reliability of the RF system.
