摘要
超导椭球腔是一种通过冲压零件和电子束焊接而成型的薄壁结构,在加工过程中存在不可避免的形变,如单元倾斜、偏轴,单元长度偏差,从而影响椭球腔的轴向电场平坦度,进而降低椭球腔的运行电场梯度。因此,在椭球腔加工成型后要进行预调谐处理。椭球腔预调谐是通过对椭球腔整形,包括倾斜和偏轴矫正,单元长度矫正,以达到提高轴向电场平坦度的目的。采用COMSOL多物理场耦合软件对CSNS-Ⅱ(China Spallation Neutron Source Phase II)超导椭球腔可能存在的形变进行了仿真计算,研究了各单元形变量对电场平坦度的影响,分析了腔体调谐位移量对电场平坦度的影响,为椭球腔预调谐提供数据参考,也为预调谐机的设计研制提供指导。另外,确定了椭球腔机械形变的要求,确保椭球腔机械加工质量满足CSNS-Ⅱ升级的实际工程需求。
Superconducting elliptical cavity is a thin-walled structure formed by stamping parts and electron beam welding, and there are inevitable deformations in the machining process, like cell tilt, cell off-axis and cell length deviation. Thus, the axial electric field flatness of the elliptical cavity is affected, and then the operating electric field gradient is reduced. Therefore, pre-tuning is necessary after the elliptical cavity finish processing. The pre-tuning of elliptical cavity is to improve the axial electric field flatness by reshaping the elliptical cavity, including the correction of cell tilt and off-axis, and the correction of cell length. This paper presents the simulation of possible deformation of elliptical cavity by COMSOL multiphysics software and analyzes the influence of cell deformation and tuning displacement on electric field flatness is analyzed, it can provide data reference for CSNS-Ⅱ elliptical cavity pre-tuning and guide the designing and developing of pre-tuning machine. In addition, it determines the requirements of mechanical deformation to ensure the machining quality of elliptical cavity to meet the actual engineering requirements of CSNS-Ⅱ.
作者
李波
刘华昌
王云
吴小磊
李阿红
瞿培华
樊梦旭
陈强
Li Bo;Liu Huachang;Wang Yun;Wu Xiaolei;Li Ahong;Qu Peihua;Fan Mengxu;Chen Qiang(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Dongguan Neutron Science Center,Dongguan 523803,China)
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2021年第3期65-69,共5页
High Power Laser and Particle Beams
基金
广东省基础与应用基础研究基金粤莞联合基金项目(2019B1515120012)。
关键词
超导椭球腔
电场平坦度
倾斜
偏轴
挤压
拉伸
调谐
superconducting elliptical cavity
electric field flatness
tilt
off-axis
extrusion
stretching
tuning
