Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.174801
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Funding
- Department of Energy Basic Energy Science [DE-FG02-07ER46272, DE-FG03-92ER40693]
- Office of Naval Research [ONR N00014-06-1-0925]
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Microbunching of a relativistic electron beam into a helix is examined analytically and in simulation. Helical microbunching is shown to occur naturally when an e beam interacts resonantly at the harmonics of the combined field of a helical magnetic undulator and an axisymmetric input laser beam. This type of interaction is proposed as a method to generate a strongly prebunched e beam for coherent emission of light with orbital angular momentum at virtually any wavelength. The results from the linear microbunching theory show excellent agreement with three-dimensional numerical simulations.
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