Helical electron-beam microbunching by harmonic coupling in a helical undulator

E. Hemsing*, P. Musumeci, S. Reiche, R. Tikhoplav, A. Marinelli, J. B. Rosenzweig, A. Gover

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number174801
JournalPhysical Review Letters
Issue number17
StatePublished - 29 Apr 2009


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