Electron beam requirements for Smith-Purcell backward wave oscillator with external focusing

Kumar, Vinay; Kim, Kwang-Je

doi:10.1103/physrevstab.12.070703

Cited by 12 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the parameters chosen, the upper threshold of energy spread for supporting oscillation is found to be approximately 9%. Such results indicate that our method for producing coherent SPR can be realized by using an electron beam with a reasonable energy spread, which is typically within 2% in the experiment [29][30][31].…”

Section: Physics Of Quasi-bic Resonancesmentioning

confidence: 77%

Improved Smith–Purcell free-electron laser based on quasi-bound states in the continuum

Chen¹,

Mao²,

Jin³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

In this article, a method to enable eﬃcient emission of coherent radiation by using an intense electron beam coupled with a quasi-bound state in the continuum (quasi-BIC) is investigated. We present an analytical solution providing an intuitive round-trip phase condition to explain the origin of quasi-BICs of dielectric gratings. Numerical study of the beam-wave interaction shows that the electrons can be bunched by the synchronous space harmonic enhanced by the quasi-BIC, resulting in self-excited coherent oscillation and consequently eﬃcient Smith-Purcell radiation. This work presents an interesting solution for coherent radiation sources, and may ﬁnd application in communications and physics.

show abstract

Section: Physics Of Quasi-bic Resonancesmentioning

confidence: 77%

Improved Smith–Purcell free-electron laser based on quasi-bound states in the continuum

Chen¹,

Mao²,

Jin³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…In the terahertz band, however, it lacks the available input driving signal to stimulate electromagnetic wave amplification, so an oscillator such as a backward wave oscillator (BWO) would be an excellent choice to generate the high power radiation [2][3][4][5][6]. The BWO can achieve a wide tunable bandwidth by changing the operating voltage in the backward wave oscillation region.…”

Section: Introductionmentioning

confidence: 99%

“…The BWO can achieve a wide tunable bandwidth by changing the operating voltage in the backward wave oscillation region. Several schemes which use a sheet beam such as traditional BWOs [2][3][4], Smith-Purcell BWOs [5,7] and BWO-clinotrons [8] have been intensively investigated. However, the region of the maximum interaction electric field and the impedance of the beam-wave interaction are both limited in these schemes, which could lead to additional instability and parasitic oscillations.…”

Section: Introductionmentioning

confidence: 99%

Design and Small Signal Analysis of a 0.2THz Sheet Beam BWO Based on the Double Staggered Metallic Rod Array

Liu¹,

He²,

Cross³

et al. 2013

1st Annual Active and Passive RF Devices Seminar

View full text Add to dashboard Cite

A double staggered metallic rod array (DSMRA) as the slow wave structure (SWS) is proposed for a terahertz backward wave oscillator (BWO) due to its superior properties. The SWS has a wider region of uniform electric field therefore a sheet beam can be used for effective beam-wave interaction. In this paper Pierce small signal theory is used to analyze the performance of the DSMRA sheet beam BWO operating at 0.2THz. Large signal particle-in-cell simulation predicted the sheet beam BWO could radiate >Guo 110W average output power in the tunable frequency range of 186-227GHz by using a 200mA electron beam.

show abstract

Improve growth rate of Smith–Purcell free-electron laser by Bragg reflector

Yang

Tsunawaki

et al. 2011

Applied Physics Letters

View full text Add to dashboard Cite

Grating with Bragg reflectors for the Smith–Purcell free-electron laser is proposed to improve the reflection coefficient, resulting in enhancing the interaction of the surface wave with the electron beam and, consequently, relax the requirements to the electron beam. With the help of particle-in-cell simulations, it has been shown that the usage of Bragg reflectors may improve the growth rate, shorten the time for the device to reach saturation, and lower the start current for the operation of a Smith–Purcell free-electron laser.

show abstract

Electron beam requirements for Smith-Purcell backward wave oscillator with external focusing

Abstract: Operation of the Smith-Purcell backward wave oscillator requires a flat electron beam. Without the electron beam focusing, the requirement leads to a very stringent criterion on vertical emittance. In this paper, we discuss a way to relax the criterion by introducing an external focusing.

Cited by 12 publications

References 25 publications

Improved Smith–Purcell free-electron laser based on quasi-bound states in the continuum

Improved Smith–Purcell free-electron laser based on quasi-bound states in the continuum

Design and Small Signal Analysis of a 0.2THz Sheet Beam BWO Based on the Double Staggered Metallic Rod Array

Improve growth rate of Smith–Purcell free-electron laser by Bragg reflector

Contact Info

Product

Resources

About