7 results about "Velocity modulation" patented technology

The invention provides an open type absorption cavity for a TM220 higher-order mode klystron and a preparation method and application of the open type absorption cavity. The open type absorption cavity is arranged in a magnetic field distribution area of a TM120 mode and a TM210 mode in an output cavity of a high-order mode klystron, and comprises a frame structure and an attenuation material body filled in the frame structure, the frame structure comprises an upper base, a lower base and a plurality of connecting pieces, the upper base and the lower base are arranged in parallel, the connecting pieces are vertically connected between a plurality of pairs of aligned corners of the upper base and the lower base respectively, a cavity structure with an open side face is defined by the upper base, the lower base and the connecting pieces, and the cavity structure is filled with the attenuation material body; the outer side faces of the attenuation material body and the peripheral face of the connecting piece are arranged in a coplanar mode, the open state of the four outer side faces of the attenuation material body is kept through the frame structure, the open outer side faces make direct contact with and are coupled with a magnetic field generated in an output cavity of the high-order mode klystron, and suppression and absorption of a TM120 mode and a TM210 mode are achieved.

The invention relates to a V-band high-power microwave oscillator based on distributed extraction, a solenoid magnetic field is electrified to generate a magnetic field, under the guidance of the magnetic field, an electron beam is transmitted into a drift tube, and is transmitted to two sections of V-band slow wave structure areas of an internal coaxial electromagnetic structure along the axial direction; in the area of the first section of slow wave structure, the beam and the wave are synchronized to enable the beam to generate speed modulation, the speed modulation obtained by the beam in the first section of slow wave structure is converted into density modulation in the drift cavity through drift motion, finally, the electron beam and the coaxial slow wave structure generate beam-wave action in the second section of slow wave structure, energy is given to a microwave field, and therefore HPM is generated. The second coaxial microwave output waveguide is communicated and coupled with the seventh slow-wave structure period and the twelfth slow-wave structure period of the second section of slow-wave structure, so that a part of energy given to microwaves by electron beams is output from the second coaxial microwave output waveguide, and the distributed extraction effect is achieved; and the power capacity of the device is effectively improved.

The application provides a mixing method, device and system, which can modulate a baseband signal or a low-middle frequency signal into a high frequency signal. The mixing of the signal is realized through the interaction between the electron beam and the signal, which overcomes the efficiency and power problems in generating a high frequency mixing signal in the prior art. In addition, the embodiment of the application can also realize the functions of generating a high frequency signal and amplifying a high frequency signal. The application uses a low-middle frequency signal to modulate the electron beam at two levels of speed, and then filters and releases the energy of the electron beam after two-stage speed modulation, so as to obtain a mixing signal in a high frequency band.

The invention provides a high-frequency system for a third harmonic klystron and a design method. The high-frequency system comprises an electron beam channel for transmitting electron beams and a resonant cavity communicated with the electron beam channel. The resonant cavity is configured to work in a hybrid mode of a fundamental mode and a target high-order mode, so that when the electron beam moves in the electron beam channel and passes through the resonant cavity, the electron beam can interact with high-frequency electric fields of the fundamental mode and the target high-order mode at the same time; the range of the proportion of the resonant frequency of the target high-order mode to the resonant frequency of the fundamental mode is 2.9-3.1. Through the high-frequency system, the problems of insufficient harmonic current and low efficiency caused by the fact that a traditional harmonic klystron only extracts harmonic energy from an output cavity are fundamentally solved.

The application discloses a mixed material input cavity for a pulse magnetic field klystron and an optimization method thereof. The mixed material input cavity comprises an inner conductor, a first outer conductor and a second outer conductor which are sleeved on the inner conductor. A drift tube cavity is formed between the outer wall of the inner conductor and the inner walls of the first outer conductor and the second outer conductor. An injection waveguide is formed between the first outer conductor and the second outer conductor. The injection waveguide and the drift tube cavity are communicated through an input cavity. The input cavity inner wall parts of the inner conductor, the first outer conductor and the second outer conductor are made of metal materials with different electric conductivities. The optimization method comprises optimizing the structure of the mixed material input cavity so that the response time of the metal materials with different electric conductivities to a magnetic field is as consistent as possible. The mixed material input cavity for the pulse magnetic field klystron aims to reduce microwave loss of injected microwaves and reduce eddy current loss.

This invention relates to a V-band high-power microwave oscillator based on distributed extraction. A magnetic field is generated by energizing a solenoid magnetic field. Under the guidance of this magnetic field, an electron beam is transmitted to a drift tube and propagates axially into two V-band slow-wave structure regions within an internal coaxial electromagnetic structure. In the first slow-wave structure region, beam-wave synchronization induces velocity modulation in the beam. This velocity modulation is converted into density modulation within the drift cavity through drift motion. Finally, in the second slow-wave structure, the electron beam and the coaxial slow-wave structure undergo beam-wave interaction, transferring energy to the microwave field, thereby generating HPM (High-Power Microwave Oscillator). The second coaxial microwave output waveguide is coupled to the seventh and twelfth slow-wave structure periods of the second slow-wave structure, allowing a portion of the energy transferred from the electron beam to the microwaves to be output from the second coaxial microwave output waveguide, achieving a distributed extraction effect. For non-distributed extraction structures, this effectively improves the device's power capacity.

The invention discloses a laser light path control method and system for micropore machining, and belongs to the technical field of laser precision machining, and the method comprises the steps: obtaining surface light feedback data of a to-be-machined area, judging the surface integrity based on the surface light feedback data, and generating a machining permission instruction when the judgment is passed; in response to the processing permission instruction, negative spatial angular dispersion distribution is preset for a laser beam to counteract positive dispersion distortion generated by subsequent scanning deflection, so that a to-be-processed light field of which the wavefront is subjected to space-time calibration is constructed; executing spiral scanning by using a to-be-processed light field, modulating pulse frequency based on real-time scanning linear velocity, and generating a cut-off signal when entering a track center singular region; plasma radiation characteristics in the scanning process are monitored, and an instruction for switching to a concentric ring pumping track from spiral scanning is generated when slag discharging blockage is recognized. According to the method, the plasma radiation characteristics in the scanning process are monitored, so that the process stability and the yield of deep hole machining are improved.