High-Power Tunable Source of Chaotic Radiation Based on a Ka-Band Helical Gyro-BWO

We present results of experiments where Ka-band chaotic oscillation regimes with a bandwidth of about 1 GHz have been obtained in a pulsed gyrotron backward wave oscillator (gyro-BWO) using a helically corrugated waveguide. The averaged radiated power reached 40 kW with a pulse duration of about 120 μs and a repetition rate of up to 10 Hz. The variation of magnetic field allows for tuning of the central frequency of the radiation in the 32.5-35.5 GHz range.