부산대학교 도서관

Cylindrical magnetrons are well-studied high-power microwave devices. The recirculating planar magnetron (RPM) increases the current and heat handling1 capabilities to generate higher microwave power. Efficient microwave extraction is an important issue for the RPM. The Recirculating Planar Magnetron with Coaxial-All-Cavity Extraction (RPM-CACE) achieves efficient power extraction from a 12-cavity magnetron by means of 6 extraction ports. Each port connects two cavities via a coaxial cavity. The six, coaxial microwave output lines are adapted to rectangular waveguide from which power is measured. This magnetron is driven by MELBA at - -300 kV, 1–10 kA, and pulse lengths of several 100 ns to oscillate at 1.9 GHz. The total instantaneous power from all six outputs was shown to be 10s of MW in experiment2. These previous experiments showed that at 1–2 kA currents the frequency, phase, and oscillation time were not well-locked between the 6 extraction ports. Simulations were performed utilizing the ICEPIC and CST codes. Simulations and experiments will be reported that explore various techniques to better lock the phase and frequency, including microwave feedback between output ports and strapping between cavities.