Technology is described for vacuum electron device (e.g., sheet beam klystron) that includes a hollow tube structure. In one example, the hollow tube structure includes at least three resonant cavities and at least two drift tube sections. Each resonant cavity includes a cavity width along a major axis and a cavity height along a minor axis. Each drift tube section includes a drift tube section width and a drift tube section height, and the cavity height is greater than the drift tube section height. A first drift tube section is disposed between a first resonant cavity and a second resonant cavity. A second drift tube section is disposed between the second resonant cavity and a third resonant cavity. A drift tube section width of the first drift tube section is substantially different from a drift tube section width of the second drift tube section.

According to one embodiment, a klystron device includes a klystron body and a focusing magnetic field device. The klystron body has an electron gun section, a collector section, a plurality of cavity resonators, and a plurality of drift tubes. The cavity resonators have nose sections that face each other in an axial direction and form a gap section that is connected to the drift tubes. At least one of the cavity resonators has an electric field correction section in a part of the nose section that makes a space of the gap section different with respect to a space between the nose sections.

According to one embodiment, a klystron device includes a klystron body and a focusing magnetic field device. The klystron body has an electron gun section, a collector section, a plurality of cavity resonators, and a plurality of drift tubes. The cavity resonators have nose sections that face each other in an axial direction and form a gap section that is connected to the drift tubes. At least one of the cavity resonators has an electric field correction section in a part of the nose section that makes a space of the gap section different with respect to a space between the nose sections.

A millimeter-wave extended interaction device, including: a device body; resonant cavities; electron beam tunnels; an output waveguide; and a coupling hole. The device body includes a shell and a core, and an annular coupling channel is disposed between the shell and the core. The resonant cavities are a set of ring-shaped cavities with a radial height of 2/5, to 3/5, parallel and equally spaced around an axis of the core. The electron beam tunnels are arranged at equal radian intervals and parallel to the axis of the core. The output waveguide is disposed in the middle of the shell and communicates with the annular coupling channel through a coupling hole. The core and the inner surface of the shell are sealed and fixed, and the output waveguide and the shell are sealed and fixed.

A millimeter-wave extended interaction device, including: a device body; resonant cavities; electron beam tunnels; an output waveguide; and a coupling hole. The device body includes a shell and a core, and an annular coupling channel is disposed between the shell and the core. The resonant cavities are a set of ring-shaped cavities with a radial height of 2/5, to 3/5, parallel and equally spaced around an axis of the core. The electron beam tunnels are arranged at equal radian intervals and parallel to the axis of the core. The output waveguide is disposed in the middle of the shell and communicates with the annular coupling channel through a coupling hole. The core and the inner surface of the shell are sealed and fixed, and the output waveguide and the shell are sealed and fixed.

A millimeter-wave extended interaction device, including: a device body; resonant cavities; electron beam tunnels; an output waveguide; and a coupling hole. The device body includes a shell and a core, and an annular coupling channel is disposed between the shell and the core. The resonant cavities are a set of ring-shaped cavities with a radial height of 2 /5 , to 3/5 , parallel and equally spaced around an axis of the core. The electron beam tunnels are arranged at equal radian intervals and parallel to the axis of the core. The output waveguide is disposed in the middle of the shell and communicates with the annular coupling channel through a coupling hole. The core and the inner surface of the shell are sealed and fixed, and the output waveguide and the shell are sealed and fixed.

A millimeter-wave extended interaction device, including: a device body; resonant cavities; electron beam tunnels; an output waveguide; and a coupling hole. The device body includes a shell and a core, and an annular coupling channel is disposed between the shell and the core. The resonant cavities are a set of ring-shaped cavities with a radial height of 2 /5 , to 3/5 , parallel and equally spaced around an axis of the core. The electron beam tunnels are arranged at equal radian intervals and parallel to the axis of the core. The output waveguide is disposed in the middle of the shell and communicates with the annular coupling channel through a coupling hole. The core and the inner surface of the shell are sealed and fixed, and the output waveguide and the shell are sealed and fixed.

According to one embodiment, a klystron device includes a klystron body and a focusing magnetic field device. The klystron body has an electron gun section, a collector section, a plurality of cavity resonators, and a plurality of drift tubes. The cavity resonators have nose sections that face each other in an axial direction and form a gap section that is connected to the drift tubes. At least one of the cavity resonators has an electric field correction section in a part of the nose section that makes a space of the gap section different with respect to a space between the nose sections.

According to one embodiment, a klystron device includes a klystron body and a focusing magnetic field device. The klystron body has an electron gun section, a collector section, a plurality of cavity resonators, and a plurality of drift tubes. The cavity resonators have nose sections that face each other in an axial direction and form a gap section that is connected to the drift tubes. At least one of the cavity resonators has an electric field correction section in a part of the nose section that makes a space of the gap section different with respect to a space between the nose sections.