Length Effect of Central Straight Section on the Electromagnetic Characteristics of Superconducting Radio-frequency Cavity

• Main Authors: Lu, Ming-Ru, 呂旼儒
• Other Authors: Yeh, Meng-Kao
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/48570996908040820827

碩士 === 國立清華大學 === 動力機械工程學系 === 102 === This study investigates the structure deformation and high-frequency electromagnetic characteristics of a superconducting radio frequency (SRF) cavity. The numerical model is established by the commercial finite element software ANSYS. Since the fundamental resonance mode of this SRF cavity is axially symmetric, called the TM010 mode, one quarter of the full structure with proper boundary conditions is modeled. Two options of HF120 element, the first order and the second order elements are used to investigate the difference and it is concluded that second-order options shall be adopted for this study. The simulation results are verified with experimental tests on a copper cavity. The resonance frequency drifts of this cavity under various situations, such as axial displacements, temperature change, axial loading and external pressure are all measured to compare with the simulation results. The effects of length of the central straight section on deformation and resonance frequency of the 1.5 GHz cavity are also evaluated.