Studies of a low-impedance coaxial split-cavity oscillator
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, No. 11, Beijing 100088 (China)
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.
- OSTI ID:
- 20764341
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 12; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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