Linear analysis of a finite length plasma-filled backward wave oscillator
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Date
1992-04Author
Ali, M.
Orgura, K.
Minami, K.
Destler, William
Granatstein, V.
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Show full item recordAbstract
Absolute instability in a plasma-filled backward wave oscillator with sinusoidally corrugated
slow wave structure driven by an intense relativistic electron beam has been analyzed
numerically. The maximum spatial growth rate of the plasma-filled waveguide is found to be
larger than that of an optimally designed vacuum structure. The excitation of a finite length
structure is investigated. Although the spatial growth rates obtained in the linear theory
increase with plasma density in the finite length plasma-filled structure for the fundamental
TM01 mode of oscillation, negative global spatial growth rates prevent the coherent oscillation
for intermediate ranges of plasma density, beam current, and even for structure length.
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