A microwave tube comprises an electron gun that emits an electron beam; a magnetic circuit that focuses the electron beam emitted from the electron gun; a collector that captures the electron beam that has passed through the magnetic circuit; a high frequency circuit that is spirally arranged around the electron beam focused by the magnetic circuit and that transmits a high frequency; and a magnetic body part arranged around the electron gun so as to be movable in an emission direction of the electron beam, wherein a high frequency output from the high frequency circuit is controlled to be constant by moving the magnetic body part in an emission direction of the electron beam.

A microwave tube comprises an electron gun that emits an electron beam; a magnetic circuit that focuses the electron beam emitted from the electron gun; a collector that captures the electron beam that has passed through the magnetic circuit; a high frequency circuit that is spirally arranged around the electron beam focused by the magnetic circuit and that transmits a high frequency; and a magnetic body part arranged around the electron gun so as to be movable in an emission direction of the electron beam, wherein a high frequency output from the high frequency circuit is controlled to be constant by moving the magnetic body part in an emission direction of the electron beam.

A coaxial amplifier having at least one electron beam is provided. The amplifier may include a conductive rod, a plurality of parallel discs on the rod, a cathode array for producing at least one electron beam. When a plurality of electron beams are formed they are arranged in an annular configuration around said rod and disks, and directed along said rod and coaxially thereof. A first waveguide may apply electromagnetic wave energy to one end of said disc and rod assembly to induce propagation of said energy along said assembly. A second waveguide may extract the amplified electromagnetic energy from the other end of the disc and rod assembly.

A coaxial amplifier having at least one electron beam is provided. The amplifier may include a conductive rod, a plurality of parallel discs on the rod, a cathode array for producing at least one electron beam. When a plurality of electron beams are formed they are arranged in an annular configuration around said rod and disks, and directed along said rod and coaxially thereof. A first waveguide may apply electromagnetic wave energy to one end of said disc and rod assembly to induce propagation of said energy along said assembly. A second waveguide may extract the amplified electromagnetic energy from the other end of the disc and rod assembly.

Vacuum electron devices (VEDs) are produced having a plurality of two-dimensional layers of various materials that are bonded together to form one or more VEDs simultaneously. The two-dimensional material layers are machined to include features needed for device operation so that when assembled and bonded into a three-dimensional structure, three-dimensional features are formed. The two-dimensional layers are bonded together using brazing, diffusion bonding, assisted diffusion bonding, solid state bonding, cold welding, ultrasonic welding, and the like. The manufacturing process enables incorporation of metallic, magnetic, and ceramic materials required for VED fabrication while maintaining required positional accuracy and multiple devices per batch capability. The VEDs so produced include a combination of magnetic and electrostatic lenses for electron beam control.

A high-power vacuum electron device source of 10 mm-0.1 mm wavelength radiation is composed of an electron gun joined to a RF vacuum electronic circuit. The electron gun includes a cathode, a focus electrode, and a grid. It generates an electron beam that is injected into the circuit for amplifying RF waves. The circuit is composed of metal circuit plates, e.g., copper alloy, that mate with each other and are shaped to provide a beam tunnel and RF circuit envelopes. Precision alignment pins made of nickel super alloy, are used to mutually align the metal circuit plates using elastic averaging implemented by positioning the precision alignment pins in precision alignment holes in the metal circuit plates. Preferably, the electron gun is aligned with the circuit using quasi-kinematic coupling.

A high-power vacuum electron device source of 10 mm-0.1 mm wavelength radiation is composed of an electron gun joined to a RF vacuum electronic circuit. The electron gun includes a cathode, a focus electrode, and a grid. It generates an electron beam that is injected into the circuit for amplifying RF waves. The circuit is composed of metal circuit plates, e.g., copper alloy, that mate with each other and are shaped to provide a beam tunnel and RF circuit envelopes. Precision alignment pins made of nickel super alloy, are used to mutually align the metal circuit plates using elastic averaging implemented by positioning the precision alignment pins in precision alignment holes in the metal circuit plates. Preferably, the electron gun is aligned with the circuit using quasi-kinematic coupling.

A microwave tube includes an electron gun that emits an electron beam; a magnetic circuit that focuses the electron beam emitted from the electron gun; a collector that captures the electron beam that has passed through the magnetic circuit; a high frequency circuit that is spirally arranged around the electron beam focused by the magnetic circuit and that transmits a high frequency; and a magnetic body part arranged around the electron gun so as to be movable in an emission direction of the electron beam. A high frequency output from the high frequency circuit is controlled to be constant by moving the magnetic body part in an emission direction of the electron beam.

A microwave tube includes an electron gun that emits an electron beam; a magnetic circuit that focuses the electron beam emitted from the electron gun; a collector that captures the electron beam that has passed through the magnetic circuit; a high frequency circuit that is spirally arranged around the electron beam focused by the magnetic circuit and that transmits a high frequency; and a magnetic body part arranged around the electron gun so as to be movable in an emission direction of the electron beam. A high frequency output from the high frequency circuit is controlled to be constant by moving the magnetic body part in an emission direction of the electron beam.

Described herein is a traveling wave tube (TWT), comprising an electron gun configured to generate an electron beam (E-beam); a signal injector configured to generate a radio frequency (RF) signal; a slow wave structure (SWS) having an aperture configured to combine the E-beam and the RF signal; an outer wall enclosing the SWS; and at least one electromagnetically-active material on one of (1) at least one projection on at least one of a periphery of the SWS and on a side of the outer wall facing the SWS and (2) the periphery of the SWS configured to receive at least one electromagnetic signal to control, on-the-fly, amplification of the RF signal by maximizing dampening of spurious modes while minimizing dampening of operating modes.