Before revision: O-type BWO The O-type carcinotron, or O-type backward wave oscillator ' , uses an electron beam longitudinally focused by a magnetic field, and a slow-wave circuit interacting with the beam.
After revision: O-type BWO The O-type carcinotron, or O-type backward wave oscillator , uses an electron beam longitudinally focused by a magnetic field, and a slow-wave circuit interacting with the beam.