Abstract: 2. In a reflex klystron tube apparatus, means for forming a beam of electrons, a resonator means positioned along the beam path, said resonator means being apertured for the passage of the beam of electrons therethrough for electromagnetic coupling to the beam, reflector means disposed on the side of the resonator remote from said means for forming the beam of electrons, said reflector means serving for reflecting the electrons incident upon the reflecting fields of said reflector means back through said resonator means substantially along the incident beam path, said means for reflecting the electrons formed and arranged to impart a slight transverse velocity to the electrons whereby they are caused to move transversely of and out of the beam in a small number of beam transits thereby minimizing unwanted amplitude and power modulation in the output signal of the tube apparatus.

Abstract: A traveling wave tube amplifier is disclosed. The amplifier employs a helix derived slow wave circuit arranged for electromagnetic interaction with a stream of electrons for amplifying wave energy applied to the slow wave circuit. A plurality of loading conductors are disposed about the outside surface of the slow wave circuit and extending lengthwise thereof. The conductors are arranged such that the spacing from the conductors to the slow wave circuit decreases toward its downstream end. The conductors are arranged such that they conduct radio frequency currents longitudinally of the slow wave circuit and do not appreciably conduct r.f. current in the direction circumferentially about the axis r.f. power flow on the slow wave circuit. Such loading conductors serve to decrease the phase velocity for wave energy on the circuit over the passband of the circuit. As a result, the interaction efficiency is substantially improved over the passband of the traveling wave tube amplifier.

Abstract: The invention relates to an X- and Gamma-ray sensitive image intensification tube for use in a so-called gamma camera or the like, which tube preferably has a single crystal input phosphor.