Joints and shape imperfections in high-Q 3D SRF cavities for RF optomechanics
Abstract
In this paper, we report on simulations of two types of high-Q 3-dimensional cavities: cylindrical TE011 and coaxial quarter-wave stub. We investigate the dependence of Q on the practical implementation tolerances of gaps between components, shape imperfections, and frequency tuning strategies. We find that cylindrical cavities can maintain high Q for designs that include frequency tuning and mechanical elements, provided extraordinary care is taken with shape and gap tolerance during construction and assembly. Coaxial stub cavities can be made with variable frequency while maintaining high Q, but they require more creativity to include a mechanical element. Finally, we report on a coaxial stub cavity, incorporating a conically shaped stub that confines the electric field near the stub’s tip, thus enhancing field–matter interactions near the tip.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 19, 2020
- Source ID
- 10.1063/5.0007451
Entities
People
- Alessandro R. Castelli
- Jacob Parker
- Jacob Pate
- Jay E. Sharping
- Johnathon J. Thompson
- Luis A. Martinez
- Raymond Y. Chiao
Organizations
- Defense Advanced Research Projects Agency
- Lawrence Livermore National Laboratory
- University of California