An experimental CW klystron for generating 0.4-mm waves

A klystron frequency multiplier for 0.4-mm waves is described, generating its own driving power by means of an oscillating extended interaction buncher. By making use of the 18th to 22nd harmonics and two catcher cavity modes, the tube is tunable over a 15 percent band. The maximum output power is 1 mW CW at 673 GHz.