265 results about "Klystron" patented technology

Multi-energy radiation sources comprising charged particle accelerators driven by power generators providing different RF powers to the accelerator, capable of interlaced operation, are disclosed. Automatic frequency control techniques are provided to match the frequency of RF power provided to the accelerator with the accelerator resonance frequency. In one example where the power generator is a mechanically tunable magnetron, an automatic frequency controller is provided to match the frequency of RF power pulses at one power to the accelerator resonance frequency when those RF power pulses are provided, and the magnetron is operated such that frequency shift in the magnetron at the other power at least partially matches the resonance frequency shift in the accelerator when those RF power pulses are provided. In other examples, when the power generator is a klystron or electrically tunable magnetron, separate automatic frequency controllers are provided for each RF power pulse. Methods and systems are disclosed.

The invention discloses a distribution terahertz oscillator, which relates to technique of THz (terahertz) electromagnetic wave sources and comprises an electron gun, an interaction region and a collector. The interaction region consists of a periodic slow wave structured modulation resonant cavity and an energy extraction cavity, and the modulation resonant cavity is in a periodic slow wave structure which can be operated in a backward wave mode or a forward wave mode to be interacted with electron beams in a distributive manner, so that the electron beams can be modulated in terms of speed and density. The distribution terahertz oscillator integrates advantages of a backward wave tube and a distribution klystron, and has the advantage of suitableness for generating THz electromagnetic waves.

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 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 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 relates to a multi-channel high-power klystron overcurrent real-time protection device with online self-checking function. The device comprises a klystron, a filament is arranged in the klystron, the two ends of the filament are connected to a filament transformer through a wire, the filament transformer is connected with a filament power supply through a wire, wires are respectively led out from the collector connecting terminal and the tube body connecting terminal of the klystron, the wire led out form the tube body connecting terminal is grounded after penetrating a hall sensor I , and the wire led out form the collector connecting terminal is grounded after penetrating a hall sensor II; one end of the filament is connected to the HVPS cathode through a current limiting resistor, the HVPS anode is grounded, and the output terminal is connected with a tommy bar through a wire; wires are respectively led out from the hall sensor I and the hall sensor II are connected to the respectively corresponding output terminals of the overcurrent protection circuit, and the signals of the hall sensors are input to the overcurrent protection circuit through wires. The invention works well in the 2.45G high-power low-hybrid wave system, can fully realize all the functions and has greatly enhanced reliability and stability at the same time.

The invention discloses an online long-pulse high-power directional coupler performance testing device and method. The online long-pulse high-power directional coupler performance testing device comprises a high-power klystron system and a vector network analyzer, the output end of the vector network analyzer is connected with a micro-wave amplifier through a micro-wave switch, the output end of the micro-wave amplifier is connect with the high-power klystron system through a first direct current break device, the output end of the high-power klystron system is connected with a bi-directional coupler through a circulator, coupling output signals of the bi-directional coupler are accessed into the vector network analyzer through a micro-wave cable after passing an attenuator and the direct current break device, and the wave guide output of the bi-directional coupler is connected to a high-power water load. The online long-pulse high-power directional coupler performance testing device uses the network analyzer as a testing apparatus and uses the output signals (about 10 mW) of the network analyzer as an oscillation source of the klystron, through testing under different klystron output power and recording S21 parameters obtained by the vector network analyzer under a long-pulse (more than 1000 s) stable running condition, the global performance of the directional coupler is obtained.

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.

A klystron has a hollow beam electron gun that has a circular planar electron emitting surface. A hollow electron beam is directed from the electron gun through a plurality of drift tubes, resonant chambers and magnetic fields to a collector. The hollow electron beam does not experience significant radial movement and can operate at a lower beam voltage which reduces the required length of the RF interaction circuit and lowers the risks of RF arcing.

A microscale vacuum electronic device (10) provides for a mechanical modulation of cathode (12) position allowing improved high-frequency modulation of an electron beam (24) useful for vacuum electronic devices such as klystrons, klystrodes, and high frequency triodes.

The invention provides a band-shaped beam klystron multi-gap cavity output apparatus. The apparatus comprises an upper cover plate, a lower cover plate, a coupling transition sheet and an output waveguide, wherein the upper cover plate and the lower cover plate are buckled for coupling, and a multi-gap output cavity is formed between the upper cover plate and the lower cover plate; the coupling transition sheet has one end disposed in a bulge structure and the other end extending out of the bulge structure through a square hole formed at the side surface of the upper cover plate and the lower cover plate, and the middle of the coupling transition sheet is provided with a transition hole whose one end is connected with the bulge structure; and the output waveguide is connected with the other end of the transition hole in the coupling transition sheet for outputting microwaves in the multi-gap output cavity to an external load. The apparatus provided by the invention improves the field coupling of interacting gaps and can adjust cavity frequency.

A multi-beam electron gun provides a plurality N of cathode assemblies comprising a cathode, anode, and focus electrode, each cathode assembly having a local cathode axis and also a central cathode point defined by the intersection of the local cathode axis with the emitting surface of the cathode. Each cathode is arranged with its central point positioned in a plane orthogonal to a device central axis, with each cathode central point an equal distance from the device axis and with an included angle of 360/N between each cathode central point. The local axis of each cathode has a cathode divergence angle with respect to the central axis which is set such that the diverging magnetic field from a solenoidal coil is less than 5 degrees with respect to the projection of the local cathode axis onto a cathode reference plane formed by the device axis and the central cathode point, and the local axis of each cathode is also set such that the angle formed between the cathode reference plane and the local cathode axis results in minimum spiraling in the path of the electron beams in a homogenous magnetic field region of the solenoidal field generator.

The invention belongs to the technical field of high-power microwaves, and discloses a three-axis relativistic klystron amplifier capable of suppressing a non-rotational symmetric clutter mode. The amplifier comprises a cathode seat 201, a cathode 202, an anode outer cylinder 203, an inner conductor 204, an injection cavity 205, a first reflection cavity 206, a first clustering cavity 207, a second reflection cavity 208, a second clustering cavity 209, a third reflection cavity 210, an extraction cavity 211, a conical waveguide 212, a feedback ring 213, an electron beam collector 214, a support rod 215, a microwave output port 216, a solenoid magnetic field 217 and an injection waveguide 218. The whole structure is in rotational symmetry relative to the central axis. Through the reasonabledesign of an electromagnetic structure of the amplifier, the defects that a lateral dual-port injection structure in an existing three-axis relativistic klystron amplifier is complex, non-rotationalsymmetric mode self-excited oscillation is difficult to completely inhibit from a physical mechanism and the like are overcome, and the three-axis relativistic klystron amplifier has good frequency-locking and phase-locking characteristics; the amplifier has important reference significance for designing a similar klystron amplifier required by high-power microwave space coherent power synthesis.

The invention provides a device and a method for performing cold test on an intermediate resonant cavity of a small-size sheet beam klystron. According to the device, the two sides of an intermediate resonant cavity are provided with through holes communicated with the two sides of a resonant cavity body. The device comprises a tuning pin, a test output flange and a vector network analyzer. The narrow end of the tuning pin is inserted into the through hole on the first side of the intermediate resonant cavity to form a cavity wall of the intermediate resonant cavity, and the wide end of the tuning pin is connected with a stepper motor. The test output flange is fixed to the second side of the resonant cavity body, the first side of the test output flange is a rectangular step, is inserted into the second side of the resonant cavity body and is sunk to the bottom, the center of the test output flange is provided with a waveguide hole which has the same size with the cross section of the through hole on the second side of the intermediate resonant cavity, and a first side of the waveguide hole is aligned at the intermediate resonant cavity. A test port of the vector network analyzer is connected to the first side of the waveguide hole in the center of the test output flange. The cold test device of the invention has the advantages of simple structure, small size, low cost and light weight, can be used for testing the tuning characteristics of the intermediate resonant cavity, and has broad application prospects.