Title :
Effects of material properties on resonance frequency of a CESR-III type 500 MHz SRF cavity
Author :
Lin, M.C. ; Wang, Ch. ; Chang, L.H. ; Luo, G.H. ; Yeh, M.K.
Author_Institution :
NSRRC, Hsinchu, Taiwan
Abstract :
A simulation that links the calculation of mechanical structure and of radio frequency electromagnetic field with the finite element code ANSYS® is employed in this study. Both efficiency and accuracy of the calculation are thus improved over those of the conventional computation that builds separate models with different codes for each computed domain because information related can be internally transferred between the different computation domains. The resonance frequency changes associated with mechanical properties of niobium are examined. The computed results indicate that the coefficient of thermal expansion significantly affects the shift in resonance frequency that occurs when the cavity is cooled from room temperature to liquid helium temperature. Young´s modulus and Poisson´s ratio have minor effects.
Keywords :
Poisson ratio; Young´s modulus; accelerator RF systems; accelerator cavities; electron accelerators; finite element analysis; materials properties; niobium; storage rings; superconducting cavity resonators; thermal expansion; 500 MHz; ANSYS; CESR-III type SRF cavity; Poisson ratio; Young modulus; finite element code; liquid helium temperature; material properties; mechanical structure; niobium; radio frequency electromagnetic field; resonance frequency; thermal expansion; Accuracy; Computational modeling; Electromagnetic fields; Finite element methods; Material properties; Mechanical factors; Radio frequency; Resonance; Resonant frequency; Temperature;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289709
