Free electron laser based on the Smith–Purcell radiation

Wang, Minghong; Liu, Pu‐Kun; Ge, Guangying; Dong, Ruixin

doi:10.1016/j.optlastec.2006.07.011

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…or the same number of N max ∼ 3 for ∼ 10 3 . These inequalities specify the rough estimate (7). For Smith-Purcell radiation, the large number of strips provides a narrow emission line, so the optimal OAM value is therefore…”

Section: Qualitative Analysis and Multipole Expansionmentioning

confidence: 99%

“…The Smith-Purcell radiation mechanism represents a relatively simple way to generate quasimonochromatic radiation from charged (electron) bunches passing near a conducting diffraction grating and it has been proved to be useful in developing compact free electron lasers [5][6][7][8] and high-resolution sensors for the particle beam diagnostics [9][10][11]. Besides the fundamental interest to the properties of radiation generated by non-Gaussian packets (in particular, by the vortex electrons), there are possible applications in electron microscopy [12] and in acceleration of the vortex electrons via inverse S-P effect [13].…”

Section: Introductionmentioning

confidence: 99%

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Smith-Purcell radiation of a vortex electron

Pupasov-Maksimov,

Karlovets

2021

Preprint

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A wide variety of emission processes by electron wave packets with an orbital angular momentum , called the vortex electrons, can be influenced by a nonparaxial contribution due to their intrinsic electric quadrupole moment. We study Smith-Purcell radiation from a conducting grating generated by a vortex electron, described as a generalized Laguerre-Gaussian packet, which has an intrinsic magnetic dipole moment and an electric quadrupole moment. By using a multipole expansion of the electromagnetic field of such an electron, we employ a generalized surface-current method, applicable for a wide range of parameters. The radiated energy contains contributions from the charge, from the magnetic moment, and from the electric quadrupole moment, as well as from their interference. The quadrupole contribution grows as the packet spreads while propagating, and it is enhanced for large . In contrast to the linear growth of the radiation intensity from the charge with a number of strips N , the quadrupole contribution reveals an N 3 dependence, which puts a limit on the maximal grating length for which the radiation losses stay small. We study spectral-angular distributions of the Smith-Purcell radiation both analytically and numerically and demonstrate that the electron's vorticity can give rise to detectable effects for non-relativistic and moderately relativistic electrons. On a practical side, preparing the incoming electron's state in a form of a non-Gaussian packet with a quadrupole moment -such as the vortex electron, an Airy beam, a Schrödinger cat state, and so on -one can achieve quantum enhancement of the radiation power compared to the classical linear regime. Such an enhancement would be a hallmark of a previously unexplored quantum regime of radiation, in which non-Gaussianity of the packet influences the radiation properties much stronger than the quantum recoil.

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Section: Qualitative Analysis and Multipole Expansionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Smith-Purcell radiation of a vortex electron

Pupasov-Maksimov,

Karlovets

2021

Preprint

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“…When the radiation is reflected back into the electron beam, the electron beam can be modulated. If the proper conditions of synchronism are met, the electron beam is bunched and the radiation is gained gradually [13][14] . shows the profile distribution of field energy in x-y plane of the coherent double electron beam interaction radiation.…”

Section: Numerical Simulation Of Coherent Double Electron Beam Interamentioning

confidence: 99%

Numerical Simulation of a Double Electron Beam Interaction

Xianzhu¹

2014

激光与光电子学进展

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Double electron beam interaction is studied by numerical simulation method. The simulation results show that when an electron beam (I) composed of many micro-pulses passes close to another electron beam (II) composed of many micro-pulses, the moving spatially periodic electric field of electron beam (II) can force the electrons in the electron beam (I) to follow a curve path, and electromagnetic radiation is stimulated by the acceleration of the electrons in the electron beam (I) along this curve path. In the same way, electromagnetic radiation is stimulated by the acceleration of the electrons in the electron beam (II) along this curve path. This novel electromagnetic radiation generated by double electron beam interaction effect is called double electron beam interaction radiation in this paper. Using a quasi optical resonator, coherent double electron beam interaction radiation with a high output peak power can be obtained.

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“…4. [10] As a sheet electron beam passes over the metallic reflecting grating, it emits S-P radiation. The resonator reflects the radiation with the emission angle θ and azimuthal angle φ = π/2, back onto the electron beam and causes the electrons to be modulated.…”

Section: The Theoretical Analysis Of the Quasi Optical Resonator Comp...mentioning

confidence: 99%

“…If the proper conditions of synchronism are met, the electron beam is bunched and the radiation is gained gradually. [10] When the interaction reaches a self-exciting condition, a steady state oscillation is established at one of the resonant frequencies of the semi-elliptical resonator. By adjusting the length of the grating period, or adjusting the voltage of the electron beam, tunable coherent S-P radiation at millimeter wavelengths can be observed.…”

Section: The Theoretical Analysis Of the Quasi Optical Resonator Comp...mentioning

confidence: 99%

Smith-Purcell free electron laser based on the semi-elliptical resonator

孟现柱¹,

王明红²,

任忠民³

2011

Chinese Phys. B

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A novel Smith-Purcell (S-P) free electron laser composed of an electron gun, a semi-elliptical resonator, a metallic reflecting grating and a collector, is presented for the first time. This paper studies the characteristics of this device by theoretical analysis and particle-in-cell simulation method. Results indicate that tunable coherent S-P radiation with a high output peak power at millimeter wavelengths can be generated by adjusting the length of the grating period, or adjusting the voltage of the electron beam. The present scheme has the following advantages: the semi-elliptical resonator can reflect all radiation with the emission angle θ and random azimuthal angles, back onto the electron beam with same-phase and causes the electrons to be modulated, so the output power and efficiency are improved.

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Free electron laser based on the Smith–Purcell radiation

Cited by 8 publications

References 8 publications

Smith-Purcell radiation of a vortex electron

Smith-Purcell radiation of a vortex electron

Numerical Simulation of a Double Electron Beam Interaction

Smith-Purcell free electron laser based on the semi-elliptical resonator

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