Observation of Self-Amplified Spontaneous-Emission-Induced Electron-Beam Microbunching Using Coherent Transition Radiation

Journal Article · Tue Dec 01 04:00:00 EST 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.81.5816· OSTI ID:342696

Tremaine, A; Rosenzweig, J B; Anderson, S; Frigola, P; Hogan, M; Murokh, A; Pellegrini, C ^[1]; Nguyen, D C; Sheffield, R L ^[2]

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1. Department of Physics and Astronomy, UCLA, 405 Hilgard Avenue, Los Angeles, California 90095-1547 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

We report the measurement of electron-beam microbunching at the exit of a self-amplified spontaneous-emission free-electron laser (SASE FEL), by observation of coherent transition radiation (CTR).thinsp The CTR was found to have an angular spectrum much narrower than spontaneous transition radiation and a narrow-band frequency spectrum. The central frequency of the fundamental CTR spectrum is found to differ slightly from that of the SASE, a finding in disagreement with previously invoked CTR theory. The CTR measurement establishes the uniformity of microbunching in the transverse dimension, indicating the SASE FEL operates in a dominant transverse mode. {copyright} {ital 1998} {ital The American Physical Society }

• Research Organization: University of California
• DOE Contract Number: FG03-93ER40796
• OSTI ID: 342696
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
66 PHYSICS
BEAM BUNCHING
COHERENT RADIATION
ELECTRON BEAMS
FREE ELECTRON LASERS