The Dusty reactor from India is said to use, "Ultrasonic vibration at 1 MHz applied to fuelled zone in tube in order to fluidise the fuel components" and "Between 15-30 W used for the ultrasonic fluidisation".
However, when looking around for a 1 MHz ultrasonic transducer that outputs (or consumes) 15 W, I don't find anything. Does anyone know more about this subject?
Here is the Dusty reactor link: