Pulsed radiation generation in closed and open cavity gyrotrons
- Univ. of Southern California, Los Angeles, CA (United States). Dept. of Electrical Engineering
Recent nonlinear, time-dependent studies indicate that radiation pulses can be generated using a tapered closed-cavity gyrotron oscillator. A cavity composed of a radially tapered section and a straight section of waveguide is designed, built and cold-tested. The resonant TE{sub 11n} modal set is almost equally spaced in frequency. Using a sinusoidal current density modulation with an amplitude of 5% of the d.c. current and frequency of 280 MHz (the inter-mode frequency spacing), the simulation results show radiation output in a train of narrow pulses ({approximately} 1 ns) at a 280 MHz repetition rate. Pulsed radiation using an open-cavity (quasi-optical) cavity gyrotron is under investigation. In this case the electron beam passes through a Fabry-Perot resonator and modes are typically weakly coupled. Velocity or current density modulation at half of the bounce frequency in cavity is used to generate short-pulse periodic output from the quasi-optical gyrotron. Numerical simulations based on low time scale equations for the electron momentum and the amplitude and phase of the electromagnetic field are presented.
- OSTI ID:
- 178255
- Report Number(s):
- CONF-950612--; ISBN 0-7803-2669-5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of mode locking in tapered cavity gyrotron oscillators
Nonlinear theory of large-signal mode locking in a gyrotron oscillator