Starting energy and current for a large diameter finite length backward wave oscillator operated at the fundamental mode
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Date
1995-04Author
Minami, K.
Ogura, K.
Aiba, Y.
Amin, M.
Zheng, X.
Watanabe, T.
Carmel, Y.
Destler, William
Granatstein, V.
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We study the starting conditions for a large diameter
(diameter/wavelength = 4.8) finite length backward wave oscillator
designed for 24-GHz operation at the fundamental T M o l
mode. This geometry is very promising for high power handling
capability. We analyze two separate threshold conditions. First,
finite length effects give rise to a threshold in electron beam
energy below which oscillations cannot be sustained at any beam
current. The second is the more familiar current threshold known
as a start current. It is also found that the growth rate for the
fundamental mode can be much larger than those of other higher
order modes thus leading to coherent operation of large diameter
source free from mode competition.
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