强激光与粒子束2026，Vol.38Issue(11)：127-134,8.DOI:10.11884/HPLPB202638.260116
麦克风测量系统在SHINE水平测试的应用
Application of microphonics measurement system in SHINE horizontal testing
余悦超 1欧阳孝含 1赵申杰 1赵玉彬 1徐凯 1郑湘 1张志刚 1杨文峰 1蒋鸿儒 1黄雪芳 1武海龙 1吴宏1
作者信息
- 1. 中国科学院 上海高等研究院 光源中心,上海 201210
- 折叠
摘要
Abstract
[Background]In the Shanghai HIgh repetitioN rate XFEL and Extreme light facility(SHINE),superconducting cavities at frequencies of 1.3 GHz and 3.9 GHz are primarily used to accelerate the electron beam.Considering both the power coupling of the RF source and the performance of the high-power coupler during the overall operation of SHINE,the loaded quality factor(QL)of the superconducting cavities is set to be greater than 4.12×107.This results in an extremely narrow operating bandwidth for the superconducting cavity system,making it susceptible to external disturbances.Consequently,the accelerating cavity voltage exhibits fluctuations,which severely impact the beam energy stability and degrade the quality of the beam.[Purpose]The main task of this study is to develop a measurement system capable of determining both the vibration frequency of external disturbance sources and the magnitude of the resulting frequency variation of the superconducting cavity during superconducting cavity operation.[Methods]The measurement system is built around NI PXIe instruments and programmed using LabVIEW for discrete data acquisition.The SEL(Symmetric Extension of Local)morphology-based discrete frequency variation principle is employed for data processing,followed by a Fourier transform to display the oscillation frequency and frequency deviation of the vibration sources.[Results]The system was verified by measuring the 1.3 GHz and 3.9 GHz cavities.The measurement error of frequency deviation was evaluated as a function of different oscillation frequencies and frequency deviations.The results show that the frequency deviation error increases with larger frequency deviation values and is proportional to the oscillation frequency.The precision of frequency deviation under different signal powers was also measured,yielding a frequency deviation error of 0.002 Hz.Using the system,the frequency deviations of eight 1.3 GHz cavities in the CM02 module and eight 3.9 GHz cavities in the HCM01 module were measured on a horizontal test platform.Additionally,the system was used to evaluate the precision of piezo actuators.[Conclusions]This system can detect the oscillation frequency and frequency deviation caused by external disturbance sources on the superconducting cavity modules,meeting the design goals of the system.It serves as a prerequisite exploration for designing subsequent microphonics suppression schemes.关键词
麦克风/超导腔/水平测试/频偏/振荡频率Key words
microphonics/superconducting cavity/horizontal testing/frequency deviation/oscillation frequency分类
能源科技引用本文复制引用
余悦超,欧阳孝含,赵申杰,赵玉彬,徐凯,郑湘,张志刚,杨文峰,蒋鸿儒,黄雪芳,武海龙,吴宏..麦克风测量系统在SHINE水平测试的应用[J].强激光与粒子束,2026,38(11):127-134,8.
