Harmonic resonance of electrons in combined helical wiggler and axial guide fields

Journal Article · Sun May 01 04:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870728· OSTI ID:6944701

Shu, X ^[1]

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1. Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088 (China)

The single-particle orbits of relativistic electrons in combined helical wiggler and axial guide magnetic fields have been studied. Based on the numerical simulations of the Raman free electron laser experiment in Shanghai Institute of Optics and Fine Mechanics, a new resonance of off-axis electrons has been shown and analyzed. This resonance is found to occur in velocity space of electrons with a beat between [Omega][sub 1] and 2[Omega][sub 2] ([Omega][sub 1] and [Omega][sub 2] are the harmonic of wiggler motion and the cyclotron frequency respectively in a frame rotating with the wiggler), in other words, there is a harmonic resonance at 2[bar [Omega]][sub [parallel]]=3[ital K][sub [ital w]][nu][sub [parallel]] ([bar [Omega]][sub [parallel]] is cyclotron frequency, [ital K][sub [ital w]][nu][sub [parallel]] is the wiggling frequency). This resonance depends on the radial displacement of the electron from axis, but without any large radial drifts in position space, which provides an explanation of a dip in radiation power that has been observed in the experiment.

• OSTI ID: 6944701
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:5; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
BEAMS
CYCLOTRON FREQUENCY
CYCLOTRON HARMONICS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTRON BEAMS
EQUIPMENT
FREE ELECTRON LASERS
HARMONICS
LASERS
LEPTON BEAMS
MAGNETS
ORBITS
OSCILLATIONS
PARTICLE BEAMS
RESONANCE
WIGGLER MAGNETS