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Issues and Challenges for Short Pulse Radiation Production


A new generation of light source is being planned at many locations, pushing the frontiers of brightness, wavelength, and peak power well beyond existing 3rd generation sources. In addition to these large scale advances there is also great interest in extremely short duration pulses into the femtosecond and sub-femtosecond regime. Collective electron bunch instabilities at these scales are severe, especially in consideration of the high-brightness electron bunch requirements. Several new schemes propose very short radiation pulses generated with moderate electron bunch lengths. Such schemes include radiation pulse compression, differential bunch spoiling, staged high-gain harmonic generation, and selective pulse seeding schemes. We will describe a few of these ideas and address some of the electron bunch and photon pulse length limitations, highlighting recent measurements at the Sub-Picosecond Pulse Source (SPPS) at SLAC where $<$100-fs electron and x-ray pulses are now available.

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