Parametric up-conversion of electromagnetic waves by a gyrating relativistic electron beam
- Department of Physics, IIT Delhi Hauz khas, New Delhi-16 (India)
A gyrating relativistic electron beam supports negative energy modes near the harmonics of the electron cyclotron frequency. An electromagnetic wave passing through such a beam parametrically up-converts into high frequency electromagnetic radiation, producing a beam cyclotron mode. In the case when pump frequency {omega}{sub 0} is away from the harmonics of cyclotron frequency, {omega}{ne}{ital l}{omega}{sub {ital c}}/{gamma}{sub 0} and {omega}{gt}{omega}{sub {ital c}}/{gamma}{sub 0}, the beam response to the pump and sideband waves is obtained by the fluid theory whereas the response at the beam cyclotron mode is kinetic. In the case when {omega}{sub 0}{approximately}{ital l}{omega}{sub {ital c}}/{gamma}{sub 0} the beam response to all three interacting waves is taken to be fully kinetic. It is seen that the normalized growth rate decreases as {omega}{sub 0}{minus}{omega}{sub {ital c}}/{gamma}{sub 0} increases for Raman as well as Compton regimes of operation. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 383798
- Journal Information:
- Physics of Plasmas, Vol. 3, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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