Extraction of Microwave Pulses from a Superconducting Cavity

Kato Keizo, Kobayashi Osamu, Miyazaki Akira, Minami Kazuo, Kimura Akio, Saeki Koshiro, Awano Mitsuru, Ohtsuka Mieko

doi:10.1585/jspf1958.49.13

An experiment is carried out to prove a new principle for a high-power microwave pulse source utilizing a superconducting cavity for energy storage. The stored energy in the cavity can be released, in a short time, by changing the coupling between the cavity and an output circuit.<BR>A stainless steel cryostat of 112 cm height and 45 cm outer diameter is designed and constructed. Inside the cryostat, a TE₀₁₁ mode cylindrical cavity made of copper is installed. Inner surface of the cavity is electroplated by lead at a thickness of the order of 20 μm. The resonant frepuency of the cavity at 4.2 K is 2.876 GHz, and the internal Q value is greater than 10⁶. The microwave power of 30 mW is incident on an input port to store the energy. At an output port, a circular waveguide which includes a movable center conductor is connected. An impulse current is given to a magnetic coil to hit up the conductor. The quick movement of the conductor causes a rapid change in the coupling between the cavity and the output circuit. We obtain microwave pulses which exceed considerably the input power, and time width of the pulse is of the order of 1 msec. It is emphasized that the output power will increase by improving the parameters of the apparatus.

Extraction of Microwave Pulses from a Superconducting Cavity

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