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Plasma effects in a free electron laser

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2 Author(s)
Tripathi, V.K. ; Dept. of Phys., Indian Inst. of Technol., New Delhi, India ; Chuan Sheng Liu

The introduction of a plasma and a strong guide magnetic field in a free electron laser (FEL) slows down the phase velocity of radiation, significantly reducing the requirements on beam energy for generating frequencies below the electron-cyclotron frequency (ω1≲ωc). Around plasma resonance (ω1p), the FEL mode couples to two-stream instability (TSI), attaining a large growth rate, comparable to that of the wiggler-free TSI. At plasma densities comparable to beam density, the beam-induced local depression in the electron density of the plasma acts as a waveguide for guiding any high-frequency radiation when the beam current is ≳17 kA

Published in:

Plasma Science, IEEE Transactions on  (Volume:18 ,  Issue: 3 )

Date of Publication:

Jun 1990

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