Progress in developing a high efficiency IOT for ionospheric heating

We report progress on the development of a high-power, high-efficiency source for a moveable ionospheric heater. The source is based on the Inductive Output Tube concept. The application requires operation in the 3–10 MHz range, thus opening the possibility to achieve true class — D operation and with that high efficiency. Our designs incorporate a solid-state driver, a grid-less gun, and a tunable output circuit. Preliminary results on a scaled device will be presented.