Helical Electron-Beam Microbunching by Harmonic Coupling in a Helical Undulator

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E. Hemsing,¹ P. Musumeci,¹ S. Reiche,¹ R. Tikhoplav,¹ A. Marinelli,^1,2 J. B. Rosenzweig,¹ and A. Gover³
¹Particle Beam Physics Laboratory, Department of Physics and Astronomy University of California Los Angeles, Los Angeles, California 90095, USA
²Università degli Studi di Roma “La Sapienza”, Via Antonio Scarpa 14, Rome, 00161, Italy
³Faculty of Engineering, Department of Physical Electronics, Tel-Aviv University, Ramat-Aviv 69978, Tel-Aviv, Israel

Received 13 August 2008; published 29 April 2009

Microbunchingof a relativistic electron beam into a helix is examinedanalytically and in simulation. Helical microbunching is shown to occurnaturally when an e beam interacts resonantly at the harmonicsof the combined field of a helical magnetic undulator andan axisymmetric input laser beam. This type of interaction isproposed as a method to generate a strongly prebunched ebeam for coherent emission of light with orbital angular momentumat virtually any wavelength. The results from the linear microbunchingtheory show excellent agreement with three-dimensional numerical simulations.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.102.174801
DOI:	10.1103/PhysRevLett.102.174801
PACS:	41.60.Cr; 42.50.Tx; 42.60.Jf; 42.65.Ky 41.60.Cr Free-electron lasers 42.50.Tx Optical angular momentum and its quantum aspects 42.60.Jf Laser beam characteristics 42.65.Ky Optical frequency conversion; harmonic generation YEAR: 2009

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