244results about "Klystrons" patented technology

According to the present invention, a non-isochronous magnetic field distribution in which the magnetic field increases as the radius increases is formed and a distribution of fixed-frequency accelerating RF voltage is formed, said non-isochronous magnetic field distribution and said distribution of fixed-frequency accelerating RF voltage being formed so that a harmonic number defined as a ratio of the particle revolution period to the period of the accelerating RF voltage decreases in integer for every particle revolution.

A drift tube linear accelerator (linac) that can be used for the acceleration of low energy ion beams. The particles enter the linac at low energy and are accelerated and focused along a straight line in a plurality of resonant accelerating structures interposed by coupling structures up to the desired energy. In the accelerating structures, excited by an H-type resonant electromagnetic field, a plurality of accelerating gaps is provided between drift tubes supported by stems, for instance alternatively horizontally and vertically disposed. A basic module composed of two accelerating structures and an interposed coupling structure, or a modified coupling structure connected to a RF power generator, is if necessary linked to a vacuum system and equipped with one or more quadrupoles.

This device allows the variation of the coupling between two points in an RF circuit in a very simple way while maintaining the RF phase relationship and varying the relative magnitude of the RF fields. The device is characterized by a simple mechanical control of coupling value, that has negligible effect on the phase shift across the device. This is achieved by the simple rotation of the polarisation of a TE111 mode inside a cylindrical cavity. Such a device does not contain resistive elements, and the sliding mechanical surfaces are free from high RF currents. This device finds an application in standing wave linear accelerators, where it is desirable to vary the relative RF field in one set of cavities with respect to another, in order that the accelerator can operate successfully over a wide range of energies.

An RF device comprising a plurality of drift tubes, each drift tube having a plurality of gaps defining resonant cavities, is immersed in an axial magnetic field. RF energy is introduced at an input RF port at one of these resonant cavities and collected at an output RF port at a different RF cavity. A plurality of electron beams passes through these drift tubes, and each electron beam has an individual magnetic shaping applied which enables confined beam transport through the drift tubes.

A slot resonance coupled, linear standing wave particle accelerator. The accelerator includes a series of resonant accelerator cavities positioned along a beam line, which are connected by resonant azimuthal slots formed in interior walls separating adjacent cavities. At least some of the slots are resonant at a frequency comparable to the resonant frequency of the cavities. The resonant slots are offset from the axis of the accelerator and have a major dimension extending in a direction transverse to the radial direction with respect to the accelerator axis. The off-axis resonant slots function to magnetically couple adjacent cavities of the accelerator while also advancing the phase difference between the standing wave in adjacent cavities by 180 degrees in addition to the 180 degree phase difference resulting from coupling of the standing wave in each cavity with the adjacent slot, such that the signals in each cavity are in phase with one another and each cavity functions as a live accelerating cavity. The resonance frequency of the slot is the comparable to the resonance frequency of the cavities, resulting in coupling of the cavities while also eliminating the need for side-cavity or other off-axis coupling cavities.

A multibeam electron tube with several approximately parallel electron beams passing through a body. Among the beams, at least some define an interbeam volume, each beam defining the interbeam volume being subjected to a perturbing azimuthal magnetic field induced by all the other beams. The tube includes an element allowing, in at least one conducting element located in the interbeam volume, flow of a reverse current in the opposite direction to that of the current of the beams, this reverse current generating, in the beams defining the interbeam space, a magnetic correction field whose purpose is to oppose the perturbing magnetic field. Exemplary embodiments of the present invention especially apply to the multibeam klystrons or traveling wave tubes.

The invention provides an S-waveband 12.1% bandwidth klystron which comprises an electron gun assembly, a cluster segment assembly and an output segment assembly. The electron gun assembly is used for emitting an electron beam which moves forwards along a drift channel under the constraint of a magnetic field; the cluster segment assembly modulates the speed and density of the electron beam emitted by the electron gun assembly to generate a high-frequency electron beam; and the output segment assembly makes beam-wave interaction with the high-frequency electron beam provided by the cluster segment assembly, wherein energy of the electron beam is converted into microwaves in an output cavity, and the microwaves are output. The S-waveband 12.1% bandwidth klystron has unique advantages in the aspects of improving the bandwidth and power.

The invention discloses a repetition-frequency low-magnetic-field axial C-waveband high-power microwave device. The device comprises an anode, a cathode, a guiding magnetic field generator, slow wave structures and a coaxial internal conductor, the anode is internally provided with an emission area and a beam wave interaction area, the cathode is arranged in the emission area, the slow wave structures and the coaxial internal conductor are arranged in the beam wave interaction area of the anode, the cathode is coaxial with the coaxial internal conductor, the slow wave structures are fixed to the inner side of the anode and arranged in the periphery of the coaxial internal conductor, a vacuum cavity is formed by vacuum pumping in the repetition-frequency low-magnetic-field axial C-waveband high-power microwave device, and the vacuum degree of the vacuum cavity does not exceed 10mPa. A baffle plate is arranged between the emission area and the beam wave interaction area. The baffle plate is provided with an annular inlet for guiding high-current electron beams generated by the cathode into the beam wave interaction area, and the diameter of the annular inlet is consistent with that of the cathode. The device is characterized by being capable of generating C-waveband high-power microwaves in repetition frequency and high in the beam wave conversion efficiency.

A slow wave structure for coupling RF energy with an electron beam comprises a co-propagating RF section including a plurality of pins having a uniform separation from the plane of an electron beam axis. An output aperture is positioned a half wavelength from a reflection section comprising a change in depth of the pintles, such that RF energy reflected by the change in pintle depth is added to the RF energy traveling with the electron beam. One or more rows of pintles are removed in the region of the output aperture to enhance coupling to the output aperture. The device may include a beam shaper for shaping the electron beam to surround the pintles, and the beam shaper and pintles may share common channels which are longitudinal to the electron beam axis. The slow wave structure may operate in forward and backward wave modes, and may be used in conjunction with other structures to form amplifiers and oscillators.

A particle accelerator device structured and arranged for use in a subterranean environment. The particle accelerator device comprising: one or more resonant Photonic Band Gap (PBG) cavity, the one or more resonant PBG cavity is capable of providing localized, resonant electro-magnetic (EM) fields so as to one of accelerate, focus or steer particle beams of one of a plurality of electrons or a plurality of ions. Further, the particle accelerator device may provide for the one or more resonant PBG cavity to include a geometry and one or more material that is optimized in terms of RF power losses, wherein the optimization provides for a PBG cavity quality factor significantly higher than that of an equivalent normally conducting pill-box cavity.

The invention discloses a same frequency heterotypical cyclotron traveling wave klystron amplifier which is characterized by comprising an input cavity, no or a plurality of bunching cavities, one or more drift segments and a traveling wave amplification segment. The input cavity, the bunching cavities and the traveling wave amplification segment are respectively connected with drift segments to form a whole. The input cavity, the bunching cavities and the traveling wave amplification segment of the same frequency heterotypical cyclotron traveling wave klystron amplifier work at the same harmonic and the same frequency, with the same working waveguide mode angular orientation index. The input cavity, the bunching cavities of the same frequency heterotypical cyclotron traveling wave klystron amplifier work under the same waveguide mode with lower order, while the traveling wave amplification segment work under the waveguide mode with higher order than the input cavity.

The invention discloses a frequency-multiplier klystron and a manufacture method thereof, relating to the technique of electron tubes. A microwave actuating signal with the frequency of f is used as an input signal; electron beams are in manual action with multiple resonant cavities of the conventional klystron in vacuum; ultraharmonics components in the Fourier spectrum of the electron beams are obviously increased after good cybotaxis is achieved; an output structure adopts the output structure of a wave band where frequency nf is positioned or utilizes the higher order mode of the conventional structure; the ultraharmonics components of the frequency nf, namely, the input frequency f and the output frequency nf, are derived from the electron beams in high cybotaxis so that the microwave small signal is amplified and the frequency is multiplied to nf from f strictly in integer multiples. The method of the invention is simple and easy to implement, and the manufactured frequency-multiplier klystron can keep comparative frequency multiplication grain, good spectrum purity, wider absolute frequency multiplication bandwidth and higher power capability.

The invention discloses a radial EIO (extended interaction oscillator) for a high-power source, belongs to the technical field of vacuum electronics, and relates to a high-power micro-wave and millimeter wave source technology. The invention designs a radial EIO adopting circular sheet electron beam under the limit of the cathode current emission density. The radial EIO comprises two disk bodies, a cathode, an insulated circular ring-shaped piece and an electron beam channel, wherein the disk bodies are symmetrically arranged in the longitudinal direction, and each disk body is provided with a control anode head and circular ring-shaped grooves. The EIO can obtain higher power under small current density by increasing the electron emission area and an electron beam channel area; compared with EIOs adopting other structures, the EIO can meet the requirement for high-power output; the EIO has better cooling capacity, and meanwhile, due to the specific cylindrical symmetry structure, machining becomes simple, and the assembly error can be effectively reduced; the cathode of an electron-optical system is located in the center of a device, the structure is compact, and the shock-proof performance is better.

A device for generating a particle beam includes a particle source, and a structure having a first section and a second section, the first section coupled to the particle source, the first section having a first power input, and the second section having a second power input, wherein the first section is configured to produce a particle beam having a first energy E₁, and the second section is configured to increase or decrease the first energy E₁ by an amount E₂, the absolute value of E₂ being less than E₁.