低温环境对超导腔位移振动特性影响的实验研究  

Experimental study on vibration displacement characteristics of superconducting cavity in cryogenic environment

作　　者：雷知迪 邓荣兵 邓海啸 甄亭亭 高飞 殷立新 黄亚威 刘以勇 LEI Zhidi;DENG Rongbing;DENG Haixiao;ZHEN Tingting;GAO Fei;YIN Lixin;HUANG Yawei;LIU Yiyong(Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海高等研究院,上海201204 [2]上海科技大学,上海201210

出　　处：《核技术》2024年第2期15-22,共8页Nuclear Techniques

基　　金：国家自然科学基金(No.12125508,No.11935020);中国科学院稳定支持基础研究领域青年团队(No.YSBR-042);上海市优秀学术带头人(No.21XD1404100);上海市基础研究特区计划项目(No.JCYJ-SHFY-2021-010)资助。

摘　　要：利用高精度磁电式速度传感器可以测量超导腔在低温环境下的振动。定量描述低温环境对超导腔位移振动特性的影响,是实现超导直线加速器亚微米级束流稳定性要求并抑制机械振动导致腔频偏移的基础,这对模组机械和低温系统设计具有重要意义。上海光源机械团队以目前承建的“硬X射线自由电子激光装置(Shanghai HIgh repetitioN rate XFEL and Extreme light facility,SHINE)”1.3 GHz超导加速模组为研究对象,在超导腔常温振动测试基础上,采用频谱分析方法研究了超导腔在300.0 K、125.0 K、2.0 K三种温度下的位移功率谱密度、位移均方根和频响函数。测试结果表明:在上海光源地面本底振动下,2.0 K低温环境引起的超导腔垂向振动影响为本底的9.4%,横向振动影响为本底的4.5%。低温环境下新增振源为冷质流动,流体工质的状态对超导腔垂向和横向振动具有不同的影响。研究成果可用于指导模组测试以及结构设计优化。[Background]The high-precision magnetoelectric velocity sensor can measure the vibration of the superconducting cavity in a low-temperature environment.[Purpose]This study aims to quantitatively investigate the effects of temperature on the vibration characteristics of a superconducting cavity and provide recommendations for designing mechanical and cryogenic systems cryomodule.[Methods]The superconducting cavity in a 1.3 GHz cryomodule of the Shanghai HIgh repetitioN rate XFEL and Extreme light facility(SHINE)was taken as research object.The mechanical vibration in frequency range of 1~100 Hz,with a direction perpendicular to the beam direction was concerned,and six vibration sensors were arranged at two measuring points to monitor the velocity signals of different components.Subsequently,the displacement power spectral density,displacement root mean square,and frequency response function of superconducting cavity at the temperature of 300.0 K,125.0 K,and 2.0 K were quantitatively analyzed using the spectrum analysis method.[Results]Vibrations of the superconducting cavity caused by the flow at 2.0 K is 9.4%and 4.5%in the vertical and transverse directions,respectively,of that caused by ground source at the Shanghai Synchrotron Radiation Facility.In a cryogenic environment,the new vibration source is the cold flow,and the different fluid states have different effects on the vibration of the superconducting cavity in the vertical and lateral directions.[Conclusions]The study is valuable for guiding the tests and optimal design of cryomodules.The vibration of superconducting cavities at low temperatures can be measured using high-precision magnetoelectric velocity sensors.It is necessary to measure and analyze the potential source and its impact to satisfy the sub-micron beam stability requirements of superconducting linac and suppress the cavity frequency shift caused by mechanical vibration.

关 键 词：超导加速模组 2.0K 低温 振动测量 频响函数 硬X自由电子激光 

分 类 号：TL503.2[核科学技术—核技术及应用]