2012, Vol.15, No.2, pp.155-162
The radiative instability of the relativistic electron beam in a
periodic dielectric-filled cylindrical waveguide is considered.
The dependence of the beam instability increment on the radiated
wave frequency near the region of dispersion equation roots
degeneracy is studied. It is shown that sharp change in the
instability of the beam under the conditions of two-wave
diffraction in Compton generation regime, making the increment
proportional to the fourth root from the beam density
in contrast to conventional law
, brings radiation
generation (amplification) in the considered system to be
essentially improved in comparison with conventional devices (BWO,
TWT, FEL etc). Numerical calculations of the instability increment
for various parameters of the system are performed.
Key words:
photonic crystal, electron beam instability, two-wave difraction
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