MUTI-MODE CAVITY ACCELERATOR STRUCTURE

For future progress in high energy physics, a multi-TeV linear accelerator is desired to explore the energy frontier. But RF breakdown is a major hurdle preventing accelerator structures from reaching high gradients. The successful completion of the project proposed here will allow development of a novel high gradient accelerator structure with low RF breakdown rate and high RF-to-beam efficiency. This project seeks to develop a novel accelerator structure using two-harmonic-mode superposition to increase acceleration gradient and suppress surface pulsed heating without increasing the RF breakdown probability. This proposed project is to develop a novel high gradient accelerator structure which is aimed for the future collider applications. During Phase I, optimization procedures will be carried out to model accelerator structures comprising bimodal cavities. A preliminary engineering design will be generated to implement the concept for proof-of-principle experiments. The successful completion of this project will provide a solution to achieve high acceleration gradient and high wall-plug-to-beam efficiency yet with low RF breakdown rate beam for the next generation accelerator. This advantage may increase the likelihood that a future multi-TeV collider will be designed with environmental and financial costs that the public will accept, and thereby generate considerable commercial activity to suppliers of accelerator components.