Three-dimensional simulation of thermal harmonic lasing free electron laser with detuning of the fundamental

Journal Article · Tue Mar 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4943886· OSTI ID:22599071

Salehi, E. ^[1]; Mirian, N. S. ^[2]

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1. Department of Physics, Amirkabir University of Technology, 15875-4413 Tehran (Iran, Islamic Republic of)
2. School of Particle and Accelerator Physics, Institute for Research in Fundamental Sciences (IPM), 19395-5531 Tehran (Iran, Islamic Republic of)

Detuning of the fundamental is a way to enhance harmonic generation. By this method, the wiggler is composed of two segments in such a way that the fundamental resonance of the second segment to coincide with the third harmonic of the first segment of the wiggler to generate extreme ultraviolet radiation and x-ray emission. A set of coupled, nonlinear, and first-order differential equations in three dimensions describing the evolution of the electron trajectories and the radiation field with warm beam is solved numerically by CYRUS 3D code in the steady-state for two models (1) seeded free electron laser (FEL) and (2) shot noise on the electron beam (self-amplified spontaneous emission FEL). Thermal effects in the form of longitudinal velocity spread are considered. Three-dimensional simulation describes self-consistently the longitudinal spatial dependence of radiation waists, curvatures, and amplitudes together with the evaluation of the electron beam. The evolutions of the transverse modes are investigated for the fundamental resonance and the third harmonic. Also, the effective modes of the third harmonic are studied. In this paper, we found that detuning of the fundamental with shot noise gives more optimistic result than the seeded FEL.

• OSTI ID: 22599071
• Journal Information: Physics of Plasmas, Vol. 23, Issue 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
C CODES
DIFFERENTIAL EQUATIONS
ELECTRON BEAMS
ELECTRONS
EMISSION
EXTREME ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
HARMONIC GENERATION
LANTHANUM SELENIDES
NOISE
NONLINEAR PROBLEMS
RESONANCE
SIMULATION
SPACE DEPENDENCE
STEADY-STATE CONDITIONS
TEMPERATURE DEPENDENCE
THREE-DIMENSIONAL CALCULATIONS
VELOCITY
X RADIATION