Thomson scattering of a vector Bessel vortex beam by a non-relativistic electron

He, Jinchong; Li, Haiying; Xu, Bin; Bai, Lu; Wu, Zhensen

doi:10.1063/5.0049398

Cited by 5 publications

(1 citation statement)

References 20 publications

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“…The interchange between the OAM of vortex beams and plasma waves [10] as well as the effect of non-linear Landau damping on plasma waves with OAM [11] form the theoretical foundation for various applications, such as the fields of vortex beam production [12,13] and plasma modulation [14]. Based on the interaction between electrons and vortex beams [15,16], our team investigated the scattering characteristics of vortex beams by a low-velocity electron [17,18]. However, the relativistic effect cannot be ignored with electrons in hightemperature plasmas and high-phase-velocity electrons.…”

Section: Introductionmentioning

confidence: 99%

Velocity inversion of a relativistic electron incident by a vortex beam in a magnetic field

Shi,

Li,

Bai

et al. 2024

Phys. Scr.

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A method is proposed to invert the velocity of a relativistic electron incident by a vector Bessel vortex beam in a magnetic field by analyzing the spectra of the backward scattered echoes. The scattering power and spectra are investigated based on the vector plane wave angular spectrum theory and the Thomson scattering theory. The results indicate that the high velocity of an electron causes the distribution of the scattered power on the x o y plane to shift in the direction of the velocity. Additionally, the spectra of the scattered echoes display periodic bimodality due to the cyclotron motion of the electrons. The velocity of a relativistic electron parallel to the applied magnetic field can be obtained from the spectrum of the scattered echoes and the parameters of the vortex beam. The conclusions suggest that both the magnitude and the direction of the velocity of a relativistic electron can be determined using a set of orthogonal magnetic fields. This work is significant for studying the scattering of vortex beams by plasmas and developing diagnostic techniques of plasmas.

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Section: Introductionmentioning

confidence: 99%

Velocity inversion of a relativistic electron incident by a vortex beam in a magnetic field

Shi,

Li,

Bai

et al. 2024

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

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Scattering by a low-velocity charge with applied magnetic fields in a Laguerre–Gaussian beam

Zhang

et al. 2022

Physics of Plasmas

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A method to analyze the scattering characteristics of a Laguerre–Gaussian (LG) vortex beam by a low-velocity charge in a steady applied magnetic field is investigated in this paper. Based on the plane wave angular spectrum representation and the electromagnetic radiation theory of a moving charge, the expressions of the scattered field and scattered power per unit solid angle are presented. Considering a low-velocity electron, the distribution of the scattered power per unit solid angle is numerically simulated. The effects of electron motion parameters, beam parameters, and applied magnetic field are discussed in detail. The results show that the longitudinal motion of the electron, which is parallel to the direction of the applied magnetic field, makes the distribution of the scattered power no longer maintain radial consistency but has a concave–convex distribution. Due to the periodicity of the circular motion of the electron in the applied magnetic field, the scattering power distribution pattern consists of many annular lobes. The spectral characteristics of the backscattered field are analyzed by fast Fourier transform. It is confirmed that the scattered field satisfies the rotational and the linear Doppler effects, and the accuracy of the formula provided in this paper is verified. This work lays a foundation for further study of the scattering characteristics of plasma on vortex electromagnetic waves and helps to promote the in-depth development of vortex beams in the field of plasma diagnosis.

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Incoherent scattering ion line spectra of vortex beams by magnetized ionospheric plasma with bi-Maxwellian distribution

Wu,

Li,

et al. 2024

J. Phys. D: Appl. Phys.

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Incoherent scattering theory is one of the important means of plasma parameter diagnosis. The incoherent scattering of vortex beams carrying orbital angular momentum can bring new incremental information to plasma diagnosis. Based on the angular spectrum theory of Bessel vortex beams and the theory of incoherent scattering, this paper studies the incoherent scattering of the ionospheric magnetized plasma to vortex electromagnetic waves under the bi-Maxwellian distribution along the magnetic field drift. The numerical results show that when the angle between the scattering wave vector and the magnetic field direction is small, the ion spectral lines have an obvious frequency shift. When the angle is close to 90°, the ion line spectra produce harmonic oscillation, and the drift speed restrains this oscillation phenomenon. The linear Doppler shift will shift the spectral line as a whole, while the rotating Doppler shift of the vortex beam will weaken the spectral line oscillation. This work may provide a possibility for further research on the scattering of vortex beams by magnetized plasma and the development of ionospheric plasma irregularities parameter inversion.

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Thomson scattering of a vector Bessel vortex beam by a non-relativistic electron

Cited by 5 publications

References 20 publications

Velocity inversion of a relativistic electron incident by a vortex beam in a magnetic field

Velocity inversion of a relativistic electron incident by a vortex beam in a magnetic field

Scattering by a low-velocity charge with applied magnetic fields in a Laguerre–Gaussian beam

Incoherent scattering ion line spectra of vortex beams by magnetized ionospheric plasma with bi-Maxwellian distribution

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