Effects of ion-channel guiding on the saturation mechanism of a single-pass free-electron laser

Raghavi, Afzal; Ninno, G. De; Mehdian, H.

doi:10.1016/j.nima.2008.03.012

Cited by 23 publications

(20 citation statements)

References 9 publications

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“…For a benchmark in our study, when we consider all quantities of each beam equal to zero results of Freund & Antonsen (1996), Raghavi et al. (2008) are recovered.…”

Section: Numerical Solutionsmentioning

confidence: 88%

“…The phase of an electromagnetic wave of frequency and wavenumber is given by and is the phase of the space-charge wave with the same frequency but wavenumber . By substituting microscopic fields and source current in Maxwell’s equations and assuming slowly varying amplitudes and wavenumbers over a wavelength (slow time-scale approximation) one could obtain the field equations (Freund & Antonsen 1996; Raghavi, De Ninno & Mehdian 2008; Mahdizadeh & Aghamir 2012). The procedure is similar to (Freund & Antonsen 1996; Raghavi et al.…”

Section: Particle-field Equationsmentioning

confidence: 99%

“…The procedure is similar to (Freund & Antonsen 1996; Raghavi et al. 2008) and results are given in the following equations, where, defines the growth rate (i.e. the logarithmic derivative) of the vector potential, , are the scaled amplitude of the vector potential, scaled amplitude of the space-charge potential and the plasma frequency denoted by the ambient beam density, respectively.…”

Section: Particle-field Equationsmentioning

confidence: 99%

“…The distance to saturation decrease to about 37.94 % because of the presence of the axial GMF; however, the decrease in the saturation length employing the ion-channel guide in FEL is about 30 % (Raghavi et al. 2008). But, the wave amplitude does not have a considerable increase within both output enhancement (i.e.…”

Section: Numerical Solutionsmentioning

confidence: 99%

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Saturation mechanism in a two-stream free-electron laser

Mahdizadeh

2015

J. Plasma Phys.

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The effect of a guide field on the saturation mechanism in a two-stream free-electron laser (FEL) is verified. Two monoenergetic electron beams with a vanishing pitch-angle spread are considered. Nonlinear wave–particle interaction is described by a set of coupled differential equations in a 1-D approximation. Output power is presented as a function of the axial distance. It was found that through using a focusing mechanism, the two-stream FEL reached the saturation regime in a shorter axial distance in comparison with the case of no focusing mechanism.

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“…For a benchmark in our study, when we consider all quantities of each beam equal to zero results of Freund & Antonsen (1996), Raghavi et al. (2008) are recovered.…”

Section: Numerical Solutionsmentioning

confidence: 88%

Section: Particle-field Equationsmentioning

confidence: 99%

Section: Particle-field Equationsmentioning

confidence: 99%

Section: Numerical Solutionsmentioning

confidence: 99%

See 2 more Smart Citations

Saturation mechanism in a two-stream free-electron laser

Mahdizadeh

2015

J. Plasma Phys.

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“…1992; Abarbanel et al. 1993; Jha, Kumar & Pande 1999; Esmaeilzadeh, Mehdian & Willet 2001; Zhang & Elgin 2004; Huang & Kim 2007; Raghavi, Ninno & Mehadian 2008; Rouhan & Maraghechi 2009; Ruan et al. 2011; Socol et al.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of electron motion and stability for different focusing regimes in a free-electron laser with three-dimensional helical wiggler

Wang

et al. 2015

J. Plasma Phys.

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Since the electromagnetic energy gained by the laser wave in a free-electron laser (FEL) is transferred from the kinetic energy loss of a relativistic electron beam, the stability of electron motion is one of the key factors that affect FEL performance. In this paper the stability of electron motion is compared for different focusing regimes. It is demonstrated that the natural focusing regime of a three-dimensional wiggler is easily broken by the self-field of the electron beam. The magnetic focusing regime of an axial guide magnetic field is based on the superposition of a strong Larmor rotation on the transverse quiver motion of the electrons, while the electric focusing regime of an ion-channel guiding field generates an electric force to counteract the divergent effect of the beam self-field. In comparison with the magnetic focusing regime of an external magnetic system, the electric focusing regime of an ion-channel guiding field may yield smaller instantaneous Larmor radius and slighter Larmor-centre deviation from the axis and provide better motion stability.

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Nonlinear analysis of the efficiency and saturation length of free electron laser with realistic helical wiggler and ion-channel guiding

Kheiri

2022

Opt Quant Electron

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Effects of ion-channel guiding on the saturation mechanism of a single-pass free-electron laser

Cited by 23 publications

References 9 publications

Saturation mechanism in a two-stream free-electron laser

Saturation mechanism in a two-stream free-electron laser

Comparative study of electron motion and stability for different focusing regimes in a free-electron laser with three-dimensional helical wiggler

Nonlinear analysis of the efficiency and saturation length of free electron laser with realistic helical wiggler and ion-channel guiding

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