TITLE

Studies of a low-impedance coaxial split-cavity oscillator

AUTHOR(S)
Wenyuan Yang; Wu Ding
PUB. DATE
June 2005
SOURCE
Physics of Plasmas;Jun2005, Vol. 12 Issue 6, p063105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A low-impedance coaxial split-cavity oscillator (SCO) for high output power is proposed and studied by simulation in this paper. By using the coaxial structure, the space-charge limiting current can be improved markedly, and thus more intense electron beams can be used for microwave generation. Compared with the conventional SCO, the modulation and extraction cavities are combined into one split cavity with an output window, whose quality factor Q is very low. And the cavity length of each section is not equal. Simulations have verified that the output power is high at medium beam voltage, the time for saturation is relatively short (about 12 ns), and the efficiency stays at almost the same level as a conventional SCO. By using an annular electron beam of 400 kV and 25 kA, the rms efficiency can reach 19% at an output power of 1.9 GW at 1.235 GHz. Simulations also show that the efficiency is insensitive to the beam power and the operating frequency is determined mainly by the structure parameters.
ACCESSION #
17636485

 

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