Plasma-loaded free-electron laser with an electromagnetic wave wiggler and axial guide field

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870878· OSTI ID:6615038

Qian, B; Liu, Y; Li, C ^[1]

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1. Department of Applied Physics, Changsha Institute of Technology, Changsha 410073, Hunan (China)

A fluid model is used to study the effects of background plasma in an electromagnetically pumped free-electron laser with an axial guide field. The dispersion relation is derived, and the growth rate is formulated for the Raman regime. Numerical calculations are also carried out for both fast electromagnetic wave and whistler wigglers propagating opposite to the relativistic electron beam. In the case of a fast wave wiggler, the background plasma can enhance the growth rate considerably, and a much larger growth rate can be obtained around cyclotron resonance [omega][sub [ital i]][similar to][Omega][sub 0], where [omega][sub [ital i]] is the angular frequency of pump wave, and [Omega][sub 0] represents the cyclotron frequency of the background plasma electrons. However, in the case of a whistler wiggler, the growth rate decreases rapidly as the plasma density increases, and a considerable decrease also occurs when [omega][sub [ital i]] is near [Omega][sub 0].

• OSTI ID: 6615038
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:12; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340 -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
BEAMS
COLD PLASMA
DISPERSION RELATIONS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
FREE ELECTRON LASERS
INSTABILITY GROWTH RATES
LASERS
LEPTON BEAMS
NOISE
PARTICLE BEAMS
PLASMA
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
RELATIVISTIC PLASMA
WHISTLERS