Compact Crab Cavity Design
The Nuclear Physics program supports a broad range of activities aimed at research and development related to the science, engineering, and technology of heavy-ion, electron, and proton accelerators and associated systems. This proposal is aimed at research into high-integrated-voltage superconducting RF crab crossing cavities. Crab cavities are an emerging technological advancement that allows for increased luminosity on crossing beamlines in the interaction region. Traditionally shaped crab cavities have an inherent tendency to be larger than normal cavities. At the same time, the crab cavity must be placed very close to the interaction region of the collider, where space is very limited. Thus research into more compact crab cavities is a critical technology development area, and to date, the necessity for such compact designs has driven researchers to look seriously at a remarkable assortment of what would otherwise be called exotic cavity shapes and configurations. We propose to assist in compact crab cavity research with an exhaustive design effort intended to improve our understanding of both the essential, and the more subtle operating characteristics of a compact crab cavity design. We will work with research programs at the Thomas Jefferson National Accelerator Facility on one candidate configuration known as the Four Rod configuration. In the Phase I, Tech-X Corporation will perform analysis and design optimization and iteration, utilizing their state-of-the art time-domain particle-in-cell software to look at LOM and HOM spectra, coupler designs, and multipactoring threats. This effort will help progress the crab cavity to a design stage ready for testing prototypes, and in the Phase II, we would participate in such testing and analysis. Commercial Applications and Other Benefits: The crab cavity design project will make heavy use of VORPAL, a commercially-available framework for simulating electromagnetic and electrostatic phenomena, including the kinetic behavior of beams and plasmas. The project will advance the state-or-the-art accelerator design tools, in an area, compact crab cavity design, in which very active research is ongoing both nationally and internationally. The international commercial market for such design tools is considerable. Furthermore, applications of this new design effort include both higher energy and nuclear physics applications, and the design techniques perfected in this project will also be useful in design of Department of Defense accelerator efforts.
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