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Description
Microbunching enables laser-like radiation generation from charged particle beam,
and is one of the main driving forces advancing accelerator light sources in the past
decades. The most prominent example is free-electron laser. A natural approach of microbunching
creation is to imprint a coherent phase space correlation on the electron
beam using a conventional quantum laser, whose information can then be preserved for
an infinitely long time in a symplectic dynamical system. This is the idea behind various
laser-based harmonic generation schemes developed in particle accelerators. In this
paper, we study laser-induced microbunching in a systematic way, including both energy
modulation and angular modulation-based schemes. Beam evolution in both phase
space and spectral space is presented to appreciate the physical essence of these schemes
in multiple respects.
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