Efficiency enhancement in a Cherenkov laser by a proper permittivity variation

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.366491· OSTI ID:550444

Hirata, A; Shiozawa, T ^[1]

---

1. Department of Communication Engineering, Osaka University, Suita, Osaka 565 (Japan)

With the aid of particle simulation, we discuss efficiency enhancement in a single-pass Cherenkov laser by varying the permittivity of a dielectric sheet loaded on a parallel plate waveguide. For the analysis of the problem, a two-dimensional model for the Cherenkov laser is considered which is composed of a planar relativistic electron beam and a parallel plate waveguide, one plate of which is loaded with a dielectric sheet. In order to maintain the synchronism between an electron beam and an electromagnetic wave, the permittivity of the dielectric is properly varied in accordance with the variation in the average velocity of the electron beam. The result of numerical simulation shows that the efficiency of energy transfer from the electron beam to the electromagnetic wave is greatly enhanced by properly varying the permittivity of the dielectric sheet. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 550444
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 82; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CHERENKOV RADIATION
DIELECTRIC MATERIALS
EFFICIENCY
ELECTRON BEAMS
FREE ELECTRON LASERS
PERMITTIVITY
RELATIVISTIC RANGE
SIMULATION
TWO-DIMENSIONAL CALCULATIONS
WAVEGUIDES