Efficiency enhancement in a dielectric-loaded Raman-type free-electron laser

Journal Article · Tue Nov 01 04:00:00 EST 1994 · IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/3.333725· OSTI ID:6857236

Shiozawa, Toshiyuki; Mikawa, Motohiro ^[1]

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1. Osaka Univ. (Japan). Dept. of Communication Engineering

Efficiency enhancement in power conversion is discussed for a dielectric-loaded Raman-type free-electron laser. To analyze the problem, the authors divide the model of a Raman-type free-electron laser into many small segments along it, in each of which the drift velocity of the electron beam is assumed to be constant. In each segment, they solve numerically the dispersion relation for the coupled electromagnetic and space charge waves to get the spatial growth rate for them. Using the spatial growth rate obtained above, they calculate the increase in the power carried by the electromagnetic wave and the decrease in the drift velocity of the electron beam in that segment. By repeating the above calculation step by step, they follow the growth of the electromagnetic wave along the electron beam. To keep the electromagnetic wave synchronized with the electron beam, they gradually increase the permittivity of the dielectric loaded on the waveguide or gradually decrease the period of the wiggler magnetic field in the direction of wave propagation in accordance with the decrease in the drift velocity of the electron beam. Thus the efficiency of power transfer from the electron beam to the electromagnetic wave can greatly be enhanced.

• OSTI ID: 6857236
• Journal Information: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States) Vol. 30:11; ISSN 0018-9197; ISSN IEJQA7
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
DIELECTRIC MATERIALS
EFFICIENCY
ENERGY TRANSFER
FREE ELECTRON LASERS
LASERS
MATERIALS
MATHEMATICAL MODELS
NUMERICAL SOLUTION
QUANTUM EFFICIENCY
RAMAN EFFECT
WAVE PROPAGATION