Speaker
Description
One pathway to producing high brightness electron beams for future light sources is to use a radio-frequency (rf) driven high field photogun to rapidly accelerate photoemitted electrons to the relativistic regime and preserve the brightness. However, the highest attainable field is limited by rf breakdowns of materials used in a photogun. Shortening rf pulse duration feeding into a photogun provides a viable pathway to achieve high field and prevent rf breakdowns. Here we propose and investigate Compressed Ultrashort Pulse Injector Demonstrator (CUPID), a nanosecond rf pulses driven photogun powered by a klystron and rf pulse compression system capable of achieving 300 MW at 20 ns duration, to produce bright electron beams with high electric field. We introduce the design of the CUPID photogun and designed performance to achieve a very high cathode field, followed by beam dynamics studies of a photoinjector formed by CUPID photogun and other beamline components. We show a proof-of-concept start-to-end simulation of the CUPID photoinjector paired with the existing Linac Coherent Light Source (LCLS) copper accelerator free-electron laser (FEL) to demonstrate achievable mJ-scale pulse energy for very hard x-ray photons at 40 keV or higher. Finally we summarize the results from current high power tests of prototype cavities and outline the future directions this project can take to validate our approach to upgrading the capabilities of LCLS.
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