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Investigations on rf breakdown phenomenon in high gradient accelerating structures

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Abstract

Particle accelerator, in which charged particles are propelled by electromagnetic field, is a powerful tool for fundamental and applied researches in various subjects. Since its birth nearly one century ago, multiple types of accelerators with different principles have been successfully developed and over 30,000 units are now in operation worldwide. For electron accelerators, the most common type applies the radio-frequency linear accelerating structure. The accelerating gradient, defined as the energy gain of particles traveling per unit length, is an essential parameter to determine the performance of an rf linear accelerating structure. Driven by the recent requirement of next generation electron-positron collider with a collision energy of TeV scale, extensive researches are being conducted to push the accelerating gradient over 100 MV/m, nearly threefold higher than that obtained with state-of-art technology. Such high accelerating gradient will also benefit other applications including free electron lasers (FEL), photocathode rf guns, and industrial/medical accelerators. However, its realization is mainly limited by rf breakdown, an extremely complicated phenomenon which includes various coupled physical procedures. rf breakdown is generally considered to be triggered by field emission from surface exposed to high electric field. This chapter introduces the application of high gradient rf linear accelerating structure, the rf breakdown phenomenon, and field emission.

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  1. Department of Engineering Physics, Tsinghua University, Beijing, China

    Jiahang Shao

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Shao, J. (2018). Introduction. In: Investigations on rf breakdown phenomenon in high gradient accelerating structures. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-7926-9_1

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