Experimental observation of helical microbunching of a relativistic electron beam

Journal Article · Mon Feb 27 00:00:00 EST 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3690900· OSTI ID:22025450

Hemsing, E; Knyazik, A; O'Shea, F; Marinelli, A; Musumeci, P; Williams, O; Rosenzweig, J B ^[1]; Tochitsky, S ^[2]

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1. Particle Beam Physics Laboratory Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095 (United States)
2. Neptune Laboratory, Department of Electrical Engineering, University of California Los Angeles, Los Angeles, California 90095 (United States)

Experimental observation of the microbunching of a relativistic electron beam at the second harmonic interaction frequency of a helical undulator is presented. The microbunching signal is observed from the coherent transition radiation of the electron beam and indicates experimental evidence of a dominantly helical electron beam density distribution. This result is in agreement with theoretical and numerical predictions and provides a proof-of-principle demonstration of proposed schemes designed to generate light with orbital angular momentum in high-gain free-electron lasers.

• OSTI ID: 22025450
• Journal Information: Applied Physics Letters, Vol. 100, Issue 9; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM BUNCHING
BEAM MONITORING
BEAM PROFILES
ELECTRON BEAMS
FREE ELECTRON LASERS
ORBITAL ANGULAR MOMENTUM
RELATIVISTIC RANGE
SIGNALS
TRANSITION RADIATION
WIGGLER MAGNETS