Efficiency enhancement of a two-beam free-electron laser

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3272094· OSTI ID:21371257

Rouhani, M H; Maraghechi, B; Saberi, H ^[1]

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1. Department of Physics, Amirkabir University of Technology, 15875-4413 Tehran (Iran, Islamic Republic of)

A local and nonlinear simulation of two-beam and tapered free-electron laser (FEL) is presented self-consistently. The slippage of the electromagnetic wave with respect to the electron beam is ignored and the relativistic electron beams are assumed to be cold. The fundamental resonance and the third harmonic radiation of the beam with lower energy are considered, in which the third harmonic is at the fundamental resonance of the beam with higher energy. The wiggler field is set to decrease linearly when the radiation of the third harmonic saturates. The optimum starting point of tapering and the slope of the reduction in the amplitude of wiggler are found by successive run of the code. Using the slowly varying envelope approximation, a set of nonlinear equations is derived which describes this system. These equations are solved numerically by the Runge-Kutta method. This method can be used to improve the efficiency of the two-beam FEL in the extreme ultraviolet and x-ray regions of spectrum.

• OSTI ID: 21371257
• Journal Information: Physics of Plasmas, Vol. 16, Issue 12; Other Information: DOI: 10.1063/1.3272094; (c) 2009 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EFFICIENCY
ELECTRON BEAMS
EXTREME ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
NONLINEAR PROBLEMS
RUNGE-KUTTA METHOD
SIMULATION
X RADIATION
BEAMS
CALCULATION METHODS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
ITERATIVE METHODS
LASERS
LEPTON BEAMS
MATHEMATICAL SOLUTIONS
NUMERICAL SOLUTION
PARTICLE BEAMS
RADIATIONS
ULTRAVIOLET RADIATION