The analysis of single-electron orbits in a free electron laser based upon a rectangular hybrid wiggler

Minbashi, Mehran; Ghahremaninezhad, Roghayeh; Maraghechi, B.

doi:10.1063/1.4752072

Cited by 4 publications

(3 citation statements)

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“…As shown in [34], depending on the axial magnetic field, there are three main groups of variations in the electron velocity: the orbits of the group I for which…”

Section: B2mentioning

confidence: 99%

“…Due to the many advantages of using a two-beam compared to a single-beam in a free electron laser, such as the increase in gain [32], coherent laser radiation [22], and other effectiveness, TSFEL with various wiggler pump fields has been studied. As an alternative to the other FEL configurations such as helical wiggler [33],a rectangular hybrid wiggler [34] and an axial solenoidal magnetic field were employed in the present study to investigate the saturation of radiation in a two-beam free electron laser, and the results of the calculations are compared with that of a one-beam FEL. Using the Maxwell equations combined with the Lorentz equation, a series of nonlinear first-order differential equations governing the evolution of the two-beam FEL for the electrons are derived, which can be solved numerically using the fourth-order Runge-Kutta approach.…”

Section: Introductionmentioning

confidence: 99%

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The Saturation Mechanism in a two-stream free-electron laser based upon a rectangular hybrid wiggler

2023

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Presented in this paper is a one-dimensional nonlinear simulation of a square hybrid two-stream free electron laser (TSFEL) consisting of an axial magnetic field guide. It is supposed that the two cold relativistic electron beams differ in energy, while the electron beam's self-fields, and radiation wave slippage relative to electron beams are neglected. A set of differential equations of the first order of coupled nonlinearity, obtained from the combination of Maxwell's equations and Lorentz's equations, can be numerically solved using a Rang-Kutta algorithm of fourth order based on slowly varying amplitudes and wavenumbers approximation. According to the results of the calculations, the increase in the axial magnetic field will result in the efficiency in group I orbits increasing while the saturation length decreases. The results for group II orbits are different from those of group I, such that the efficiency decreases with the increasing axial magnetic field. There is, however, an increase in saturation length. Furthermore, it is found that prebunching significantly reduces the length of saturation. A comparison of radiation saturation in an FEL and a TSFEL indicates that a TSFEL has a higher efficiency than an FEL. In contrast, the TSFEL has shorter saturation lengths.

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“…As shown in [34], depending on the axial magnetic field, there are three main groups of variations in the electron velocity: the orbits of the group I for which…”

Section: B2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Saturation Mechanism in a two-stream free-electron laser based upon a rectangular hybrid wiggler

2023

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show abstract

“…Since there is no current source inside the waveguide, according to [9] and [12], in addition to the divergence, the curl of magnetic field is also zero ( 0    B and 0   B ).…”

Section: Magnetic Structurementioning

confidence: 99%