Miniaturized THz source with free-electron beams

The paper presents a novel miniaturized tunable, portable THz source for this frequency range using the Dynatron oscillator to control two miniaturized field emitter electron beam sources of high brightness, which emit charge pulses in each half wave´s time to fly across a resonator, however through opposite apertures with opposite directions. The emitted infra-red dipole radiation is guided by a resonator and focused by lenses to the object. The output power at 0.2 THz to 10 THz is estimated do reach 0.5 W.