According to one embodiment, a klystron includes an electron gun unit, a plurality of resonant cavities, a collector, and a plurality of drift tubes. The resonant cavities include an input cavity, a plurality of intermediate cavities, and an output cavity, positioned sequentially along the traveling direction of electrons from the electron gun unit. The intermediate cavities include a plurality of second harmonic cavities. The collector captures the electrons that have passed through the resonant cavities. The drift tubes are provided between the electron gun unit and the input cavity, between the resonant cavities, and between the output cavity and the collector.

A microwave energy tool including a sheet beam klystron that includes a tube body for carrying an electron sheet beam that has a plurality of cavities and a magnetic solenoid wound directly on the tube body.

A microwave energy tool including a sheet beam klystron that includes a tube body for carrying an electron sheet beam that has a plurality of cavities and a magnetic solenoid wound directly on the tube body.

To suppress both influence of electron emission from a cathode side surface and consumption of energy to be supplied to a heater, while being provided with a grid, an electron gun of the present invention includes: a cathode capable of emitting electrons by heating; a grid capable of controlling the electron emission; and a cathode shield which is an conductor including a material portion located in the vicinity of a side surface of the cathode and facing at least a portion of the side surface via a gap or a heat insulating material, and not being made in direct physical coupling nor in direct physical contact with the cathode.

Embodiments include a vacuum device, comprising: an enclosure configured to enclose a vacuum, comprising an external base forming at least a portion of the enclosure; an internal base within the enclosure; and at least one thermal dissipative strap assembly, comprising: an internal base thermal conductive base in contact with the internal base, an external base thermal conductive base in contact with the external base, and a flexible thermal dissipative strap coupling the internal base thermal conductive base to the external base thermal conductive base.

Embodiments include a vacuum device, comprising: an enclosure configured to enclose a vacuum, the enclosure including an external base including an opening; an internal base within the enclosure; and an adjustable support assembly adjustably coupling the internal base to the external base and extending through the opening, the adjustable support assembly comprising: a threaded shaft extending along a longitudinal axis and coupled to the internal base; a threaded hole component threadedly engaged with the threaded shaft and coupled to the external base such that the threaded hole component is axially constrained in a direction along the longitudinal axis relative to the external base independent of the threaded shaft; and a flexible component coupled to the external base and the threaded shaft and sealing the opening.

An electron beam 3D printing machine (1), comprising a chamber (2) for generating and accelerating an electron beam and an operating chamber (3) in which a metal powder is melted, with the consequent production of a three-dimensional product. The chamber (2) for generating and accelerating an electron beam houses means (4) for generating an electron beam and means (6) for accelerating the generated electron beam, while the operating chamber (3) houses at least one platform (16) for depositing the metal powder, metal powder handling means (18) and electron beam deflection means (15). The accelerator means for the generated electron beam comprise a series of resonant cavities fed with an alternating signal.

An electron beam 3D printing machine (1), comprising a chamber (2) for generating and accelerating an electron beam and an operating chamber (3) in which a metal powder is melted, with the consequent production of a three-dimensional product. The chamber (2) for generating and accelerating an electron beam houses means (4) for generating an electron beam and means (6) for accelerating the generated electron beam, while the operating chamber (3) houses at least one platform (16) for depositing the metal powder, metal powder handling means (18) and electron beam deflection means (15). The accelerator means for the generated electron beam comprise a series of resonant cavities fed with an alternating signal.

Provided is a klynac including: a klystron input cell configured to form a first resonant circuit; a klystron output cell; and a plurality of linac cells configured to form a second resonant circuit with the klystron output cell.

Provided is a klynac including: a klystron input cell configured to form a first resonant circuit; a klystron output cell; and a plurality of linac cells configured to form a second resonant circuit with the klystron output cell.