C-ADS喷油器I轮辐腔传递函数的测量
Measurement of the transfer function for a spoke cavity of C-ADS Injector I
摘要：
中国加速器驱动次临界系统（C-ADS）中安装的轮辐腔具有高品质因数（Q）和非常小的带宽，这使得它们对外部或自诱导的机械扰动非常敏感。传递函数用于表征腔本征频率对扰动的响应。本文介绍了一种测量轮辐谐振腔传递函数的方法。测量得到的Lorentz传递函数表明，在C-ADS谐振腔中，洛伦兹力激发出206 Hz和311 Hz的机械本征模;测量得到的压电快调谐器传递函数表明，在0 ~ 500 Hz范围内，C-ADS谐振腔中存在12个机械本征模。在此基础上，采取了一些有效措施，减弱了氦气压力波动的影响，避免了机械共振，提高了射频系统的可靠性。
英文摘要：
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 eigen frequency 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 eigenmodes excited by Lorentz force in the cavity of C-ADS, and the measured piezo fast tuner transfer function shows there are 12 mechanical eigenmodes from 0 to 500 Hz. According to these results, some effective measures have been taken to weaken the influence from helium pressure fluctuation, avoid mechanical resonances and improve the reliability of RF system.
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