28 results about "Electron pulse" patented technology

The invention discloses a new energy station intrusion detection method based on a linkage technology, equipment and a medium, and relates to the technical field of new energy station safety protection, electronic pulse fences, infrared correlation and video acquisition equipment are deployed, perimeter signals and images are acquired, multi-source data are fused through space-time calibration and a D-S evidence theory, a target is detected by using a YOLOv5 model, and a new energy station intrusion detection result is obtained. Kalman filtering is used for predicting a track, distinguishing normal operation and intrusion behaviors, setting a three-level response mechanism, triggering sound-light alarm, access control blocking and the like, data are stored, a model is optimized regularly, environment self-adaptive adjustment can be achieved, operation areas can be dynamically divided, and the detection reliability is improved. According to the invention, intelligent detection and linkage response of new energy station intrusion are realized, the false alarm rate is significantly reduced, the target detection precision and trajectory prediction accuracy are improved, the response time is shortened, the maintenance cost is reduced, the data security is enhanced, a security guarantee is provided for unattended operation, and the management efficiency and security are improved.

An embodiment of the present disclosure provides a pulse electron microscope device including: a pulse generator configured to emit a laser pulse; a first beam splitter configured to split the laser pulse into a first laser pulse and a second laser pulse; a second beam splitter configured to split the second laser pulse and to reflect a second-1 laser pulse; an interval controller configured to control a time interval between the first laser pulse and the second-1 laser pulse by controlling an optical path length of the first laser pulse; a column part including a photocathode, the photocathode configured to convert the first laser pulse into a first electron pulse and convert the second-1 laser pulse into a second electron pulse; and an inspection module configured to inspect electrical defects in the sample by detecting a change in potential occurring on a surface of the sample.

The invention relates to an X-ray diode signal reconstruction method. The method comprises the following steps: determining an electronic pulse time broadening multiplying power function; determining an MCP gain function; acquiring an electronic pulse signal output by the X-ray diode system; performing primary processing on the electronic pulse signal based on the electronic pulse time broadening multiplying power function to obtain a primary processing pulse signal; performing secondary processing on the primary processing pulse signal based on an electronic pulse time broadening multiplying power function to obtain a secondary processing pulse signal; and processing the secondary processing pulse signal according to the MCP gain function to obtain a reconstructed signal. According to the invention, the influence of inconsistent electronic pulse time broadening multiplying power at each slope position of the cathode pulse and inconsistent MCP gain on the measurement precision of the X-ray diode system can be reduced, the accurate reconstruction of the input signal of the X-ray diode system is realized, and the measurement precision of the X-ray diode system is effectively improved.

The application discloses a kind of ultrafast electron pulse pulse width measurement system and measurement method based on time amplification stripe scanning, solve the existing pulse width measurement technology to the pulse width measurement of ultra-short electron pulse, there is the problem of low measurement precision, complex measurement system and high cost when meeting the measurement demand of the length of ultrafast electron pulse beamlet of electron pulse width less than hundred femtosecond;The method of the application utilizes femtosecond order ultrafast electron pulse itself space charge effect and vacuum dispersion effect to occur time broadening effect, and is broadened to picosecond order that can be detected by traditional stripe scanning method, the time broadening amount of electron pulse can be obtained using space-time broadening theory;Ultrafast electron pulse pulse width after broadening is obtained using stripe scanning deflection method, and the pulse width of ultrafast electron pulse can be obtained by inversion;The method of the application can accurately characterize femtosecond order ultrafast electron pulse pulse, and has high time resolution, simple system principle and easy realization.

This invention belongs to the field of precision scientific instruments and vacuum technology, and discloses a liquid ultrafast electron diffraction experimental station integrating a THz diagnostic structure. The station includes a vacuum chamber, a double-sided flange arranged upstream of the liquid film location along the electron beam transmission path, a position adjustment structure, a vacuum differential pipe, and a THz diagnostic structure. The double-sided flange is fixed between the vacuum pipe flange outside the vacuum chamber and the vacuum chamber itself. The position adjustment structure is axially and adjustablely fixed coaxially within the double-sided flange. The vacuum differential pipe is coaxially fixed within the position adjustment structure and passes through the sidewall of the vacuum chamber. The THz diagnostic structure is positioned between the vacuum differential pipe and the liquid film location. This invention integrates a vacuum differential system and a THz electron beam diagnostic system in situ within a single vacuum chamber, achieving synchronous compatibility between liquid-phase ultrafast electron diffraction and electron pulse time-domain diagnostics, ensuring the accuracy of time-resolved assessment of liquid-phase structure dynamics.

The invention relates to the technical field of electron emission, and discloses a large-current pulse micro-channel plate electron emission source and an X-ray generation device. According to the electron emission source, an electron emission function layer at the head end of an MCP assembly is excited by adopting a rapidly regulated and controlled UV LED light source, and ultrafast time sequence modulation of electron beams is realized through an avalanche multiplication process of the electron beams in the MCP. By adopting a specific high-lead, low-alkali or alkali-free glass component or ceramic substrate composite functional film layer structure, the MCP assembly has long service life stability of low resistance, high current output and high power density operation. Independent bias voltage and gating voltage synchronous with electronic pulse are applied to the MCP assembly through the driving control unit, accurate thermal management is carried out in combination with a pulse-charging circulation mode, and the problems of charge compensation and thermal limitation under large current output are effectively solved. The electron emission source breaks through the bottleneck, supports peak current density exceeding 100 mA / cm under submicrosecond pulse, and realizes hundred microampere level steady-state current output under millisecond level long pulse.

The application relates to an X-ray diode signal reconstruction method, which comprises the following steps: determining an electron pulse time expansion multiple function; determining an MCP gain function; obtaining an electron pulse signal output by an X-ray diode system; performing first processing on the electron pulse signal based on the electron pulse time expansion multiple function to obtain a first processing pulse signal; performing second processing on the first processing pulse signal based on the electron pulse time expansion multiple function to obtain a second processing pulse signal; and processing the second processing pulse signal according to the MCP gain function to obtain a reconstructed signal. Through the application, the influence of the inconsistency of electron pulse time expansion multiples at different slope positions of a cathode pulse and the inconsistency of MCP gains on the measurement accuracy of the X-ray diode system can be reduced, the input signal of the X-ray diode system can be accurately reconstructed, and the measurement accuracy of the X-ray diode system can be effectively improved.

The invention provides a substance detection system and method and diagnostic equipment, and belongs to the technical field of electron diffraction, and the substance detection system comprises an electron emission module, a laser emission module and a detection module. The electron emission module comprises an electron emitter and a grid electrode. The electron emission module is used for emitting electronic pulses to the to-be-detected sample in the excited state. The grid electrode is arranged on the periphery of the electron emitter and regulates and controls electron beams emitted by the electron emitter. The laser emission module is used for emitting laser pulses to a to-be-detected sample, so that the to-be-detected sample reaches an excited state. And the detection module is used for detecting detection signals obtained by the laser emission module and the electron emission module acting on the to-be-detected sample. The electronic emission module, the laser emission module and the detection module are arranged to be in mutual time synchronization. According to the substance detection system and method provided by the invention, the dynamic process of different substances in different time scales can be represented, and the technical problem that the application range of a traditional system is narrow is solved.

The application discloses a dose control device and method of a medical electronic linear accelerator, which comprises an electronic pulse generator, a microwave pulse generator, a control computer, a trigger pulse generator, a counting frequency divider, a dose counter, a switch, a first circuit, a second circuit and an ionization chamber; the output end of the trigger pulse generator is in communication connection with the input end of the dose counter through the counting frequency divider, the output end of the dose counter is in communication connection with the input end of the switch, and the output end of the switch is in communication connection with the input end of the electronic pulse generator through the first circuit; the output end of the trigger pulse generator is also in communication connection with the input end of the switch; and the output end of the trigger pulse generator is also in communication connection with the input end of the microwave pulse generator through the second circuit. The application has the advantages of simple structure, high reliability and the ability to realize meticulous, more accurate and more balanced dose distribution.

An electron beam device 100 for generating a pulsed electron beam 1 including a sequence of electron pulses comprises an irradiation source device 10 for generating a sequence of emitter excitation pulses 2, in particular laser pulses; an electron source device 20 having a photoemission electron source 21 for irradiation-induced emission of source electron pulses 3 in response to irradiation with the emitter excitation pulses 2; a number-state disperser 30 for spatially separating the source electron pulses 3 into sub-pulses 4, 4A, each sub-pulse 4, 4A including an integer number n of electrons, where n = 1, 2, 3, ...; and a number-state selection device 40 for selecting sub-pulses 4, 4A including at least one set of predetermined electron number states as the generated pulsed electron beam 1. Preferably, the photoemission electron source 21 is configured to generate countable low-charge electron pulses, e.g., including 1, 2, 3, or 4 electrons per pulse. Methods for generating the pulsed electron beam 1 and for using the electron beam device are also described.

The application discloses a kind of ultra-high space-time resolution imaging method and imaging system based on carbon nanotube electron source, it is related to ultrafast optics and atomic level imaging technical field.Carbon nanotube is assembled to tungsten needle tip tip end to construct carbon nanotube electron source;Design ultrafast pulsed laser pumping-detection system, pumping light will sample from ground state to excited state, probe light is formed on carbon nanotube electron source to form ultrafast photoelectron pulse, and two beams of light keep certain optical path difference;Electron pulse is projected to screen by point projection imaging system to project the ultrafast transient information of sample.The application can effectively avoid the broadening caused by vacuum dispersion effect and space charge effect when carrying out high spatial resolution imaging, to a certain extent, retain the narrow pulse width characteristics of electron source induced by ultrafast laser when emitting and the characteristics of extremely high spatial coherence of carbon nanotube electron source.

An electron beam source includes a vacuum chamber containing a cathode and an anode separated by a vacuum gap forming a local full-voltage capacitive structure storing electrical energy at an operating voltage. A high-voltage power supply charges the capacitive structure without an intervening Marx generator, linear transformer driver, Tesla transformer, pulse-forming network, or pulse-forming transmission line. A triggering arrangement initiates electron emission to produce electron pulses traversing the vacuum gap, with discharged electrical energy transferred predominantly to electrons crossing the gap. In some embodiments, the local capacitive structure stores a majority of total electrical energy stored at the operating voltage in capacitances directly coupled between conductors at cathode and anode potentials. Multi-beam configurations, beam steering, passive synchronization, and contamination management features may be included.

The invention discloses a high-frequency radiation source based on photoinduced ultrafast and ultrashort electron pulses. The radiation source comprises a cathode structure (11), a first insulating ceramic sheet (32), a grid structure (12), a second insulating ceramic sheet (33), a focusing electrode structure (13), a third insulating ceramic sheet (34), an anode structure (14), a fourth insulating ceramic sheet (35), an output section component (20), a fifth insulating ceramic sheet (36), and a collector structure (15), which are arranged in sequence and all have through holes at their centers. A small ultrafast laser (50) is arranged on the other side of the collector structure (15); the small ultrafast laser (50) generates laser light that irradiates the surface of a nano cold cathode (111) through the through hole, and the surface of the nano cold cathode (111) generates ultrafast and ultrashort electron pulses that are transmitted to the output section component (20) to generate electromagnetic waves. The radiation source disclosed by the invention has a simple structure, a small size, good stability, and low cost.

The invention discloses a transition radiation polarized wave regulation and control method and system based on an isotropic material. The regulation and control method comprises the following steps: calculating an equivalent current according to an oblique incidence electronic pulse velocity vector and converting the current into a frequency and wave number space; calculating an electron radiation field equation and an interface radiation field equation according to the Maxwell equation set; solving the electron radiation field equation and the interface radiation field equation to obtain an electron radiation field and an interface radiation field; adopting a phase matching algorithm to calculate a total field on two sides of the regulation and control material interface; calculating a transverse magnetic wave far-field radiation angular spectrum and a transverse electric wave far-field radiation angular spectrum excited during electron incidence by adopting boundary phase matching; and regulating and controlling the separation of the transition radiation polarized waves in space according to the relationship between the calculated energy angular spectrum spatial distribution of the transition radiation field and the incident angle of the electronic pulse and / or the electromagnetic parameters of the regulation and control material. According to the invention, the problem that excitation of different modes of transition radiation waves and separation of different modes of radiation fields in space are difficult to autonomously regulate and control in the prior art is solved.

The invention provides a ray generator, which comprises a magnetron used for generating microwave energy under the action of a magnetic pulse sequence; the electron gun is used for generating electron beams under the action of the electronic pulse sequence; the accelerating tube is used for introducing microwave energy and electron beams and accelerating the electron beams according to the microwave energy; the controller is used for acquiring target accumulated dose data within target time and determining an electronic pulse sequence and a magnetic pulse sequence based on the target accumulated dose data, the magnetic pulse sequence comprises N magnetic pulses, and the N magnetic pulses are arranged at intervals in the time sequence; at least one electronic pulse in the electronic pulse sequence is synchronized with the N magnetic pulses in time sequence, and the number of the N magnetic pulses synchronized with the at least one electronic pulse in time sequence is adjustable. The invention further provides a ray generation method and radiation equipment.

The utility model relates to a lamp electronic pulse test generating circuit which comprises a lamp to be tested, a test voltage switching module, an analog quantity generating module, an optocoupler control module and an output level control chip. In the test voltage switching module, a first switch and a second switch are connected with a first high-voltage power supply, and a third switch and a fourth switch are connected with a second high-voltage power supply. In the analog quantity generation module, a pin 4 of an analog quantity generation chip is connected with a first high-voltage power supply in the test voltage switching module; and a pin 7 of the analog quantity generation chip is connected with a second high-voltage power supply in the test voltage switching module. A first optocoupler, a second optocoupler and a third optocoupler in the optocoupler control module control the first switch, the second switch, the third switch and the fourth switch to be connected through a NOT gate isolation chip. Compared with the prior art, the system has the advantages of high flexibility, high accuracy, high safety and the like.

The present invention relates to a terahertz-driven femtosecond electron pulse chopping and compression device, comprising a laser light source, a beam splitter, an ultraviolet laser pulse generator, a single-cycle terahertz pulse generator, an electron gun, an electron focusing device, an electron beam deflection device, an electron pulse chopping device, an electron pulse length measurement device, a fluorescent screen, and a camera. Laser pulses generated by the same laser light source are split into three paths: one laser beam enters the ultraviolet laser pulse generator for electron beam generation, and the other two beams are incident on the single-cycle terahertz pulse generator. The two generated terahertz pulses are incident on the electron beam deflection device and the pulse length measurement device for electron modulation. The electron pulses are excited by ultraviolet light, and the electron focusing device focuses them on the electron beam deflection device. The deflected electrons are chopped and compressed before being collected by a detection system. The present invention has a time resolution of up to 50 femtoseconds and good time synchronization, making it widely applicable to the study of ultrafast dynamics.

The invention relates to a high-temporal-spatial-resolution diagnosis system which comprises an electronic pulse energy dispersion regulation and control system, an electronic pulse space dispersion regulation and control system, a gated imaging system, an ultrafast electric pulse generator and a high-voltage narrow pulse generator. The electronic pulse energy dispersion regulation and control system comprises a micro-strip cathode structure based on electric pulse reflection superposition enhancement, an anode and an electronic flight tube; the gated imaging system comprises a micro-channel plate, a fluorescent screen, a light cone and a camera; and after each path of ultrafast electric pulse in the plurality of paths of ultrafast electric pulses is respectively input to the microstrip cathode corresponding to the microstrip cathode structure, superposition of double paths of electric pulse signals is formed through the reflection effect of the microstrip cathode structure, and the microstrip cathode structure is excited. The micro-strip cathode structure is utilized to reflect ultrafast electric pulses, so that voltage compensation is realized, the problem of non-uniform spatial voltage distribution of the micro-strip cathode is solved, the imaging size is improved, large-imaging-size detection is realized, the slope of ultrafast electric pulse signals is enhanced, and the time resolution is further improved.

The application aims at solving the technical problem that the time resolution of the system is difficult to break through the technical barrier of 100 femtoseconds due to the phase jitter between the radio frequency field and the pump laser in the prior art, and providing an ultrafast electron pulse non-jitter static magnetic time compression device and compression method; the device comprises a femtosecond laser, an ultrafast electron gun, an electron beam collimation transmission assembly, an Omega type static magnetic time compression assembly, an electron beam aberration correction and final stage focusing assembly and a sample cavity which are sequentially arranged on the light output path of the femtosecond laser; the Omega type static magnetic time compression assembly is used for introducing an energy related time delay to the ultrafast electron pulse, compensating the initial time chirp of the electron pulse, and compressing the pulse width of the ultrafast electron pulse to below 100 femtoseconds. In the process of electron pulse acceleration and pulse compression, the device does not need to consider the time jitter between the radio frequency field and the femtosecond laser, and can maximize the time resolution of the ultrafast characterization instrument.

Systems and methods extending operational lifetime of field emission array vacuum tubes. A getter within the vacuum tube is selectively activated based on operational state trigger conditions like gate current, time intervals, or electron pulse counts. Getters may be activated through conductive or inductive heating. The method involves providing a vacuum tube, FEA construct, and getter; evacuating and sealing the tube; and getter activation based on predetermined trigger conditions. This approach efficiently manages vacuum quality, prolonging tube life.

The invention relates to a self-adaptive cleaning method suitable for a display screen and a display system. The self-adaptive cleaning method comprises the steps that S1, a starting instruction is received; s2, controlling a sensor to detect a screen; s3, receiving data detected by the sensor; s4, according to the data detected by the sensor, judging the oil stain type; s5, selecting an adaptive duty ratio to drive a vibration circuit to generate vibration with a corresponding preset hertz value according to the types of the oil stains; s6, after cleaning is completed, the steps S2-S5 are repeated; and S7, sending an ending instruction under the condition that the clean state is judged. Self-adaptive cleaning of the surface of the screen is achieved through the electronic pulse vibration and intelligent detection technology, the screen is cleaned in a liquid-free and consumable-free full-electronic control mode, and the scheme has the advantages of being low in cost, wide in application range and easy and convenient to maintain.

An electron beam pulser suitable for SEM systems directs ≤30 keV electrons through a stripline kicker. RF waves or voltage pulses deflect the beam to periodically impinge on an aperture, thereby creating electron pulses from 100 fs to 100 ns in width. In RF embodiments, the RF frequency is tuned to provide 180-degree phase slippage between the RF and the electron beam, thereby generating pulse repetition rates up to 20 GHz without divergence. The RF can be reverse propagated through the kicker to reduce kicker size and / or increase the maximum pulse repetition rate. Voltage pulse embodiments provide flexible pulse widths and timing with repetition rates up to 1 GHz. A DC bias is applied to enable electron transit only during the voltage pulses, or offset voltage pulses of opposite sign can produce narrow electron pulses only during voltage pulse overlap. The EMMP can be synchronized for pump-probe experiments.

The invention provides an adaptive control method and system for a klystron of a medical accelerator, the medical accelerator comprises an excitation source used for generating microwave pulses and an accelerating tube used for accelerating injected electronic pulses, and the method comprises the following steps: acquiring a reflected wave signal at the input end of the accelerating tube; calculating the current resonant frequency of the accelerating tube according to the reflected wave signal; and calculating the frequency deviation between the current output frequency of the excitation source and the current resonant frequency of the accelerating tube, and outputting a frequency tuning instruction to the excitation source based on the frequency deviation so as to adjust the output frequency of the excitation source and enable the output frequency of the excitation source to track the resonant frequency of the accelerating tube. The technical problem of logic failure caused by dislocation of a control object in a traditional automatic frequency control scheme is solved, the output frequency of the excitation source is dynamically adjusted through closed-loop control, efficient injection of microwave energy is ensured, and the system stability and clinical reliability of the system are improved to a great extent.

This invention relates to a high-time-resolution X-ray radiation flow diagnostic system. The system includes a microstrip cathode, a first anode grid, a vacuum drift tube, a short magnetic lens, a microchannel plate, a second anode grid, an anode, and a high-speed oscilloscope, arranged sequentially on the same axis. The microstrip cathode is subjected to a negative DC bias voltage and a curve-broadening pulse output from a high-voltage pulse generator. The microchannel plate is subjected to a gain compensation pulse, which is delayed by the broadening pulse. The delay time is the flight time required for photoelectrons generated by the microstrip cathode to travel from the microstrip cathode to the microchannel plate in the vacuum drift tube. This invention utilizes an electron pulse broadening system to broaden the time width of the photoelectron beam, achieving temporal amplification of the electron beam. Then, an electron signal sampler with an ultrafast time response is used to measure the time-amplified electron beam, thereby improving the system's time resolution.

The invention provides a magnetic field detection method, an X-ray tube magnetic field detection method, an X-ray tube magnetic field detection system and a control method, and belongs to the technical field of magnetic field detection.The method comprises the steps that electronic pulses are emitted to a to-be-detected magnetic field area, and the electronic pulses are generated according to preset time delay; detecting electron beam spot information after the electronic pulse passes through the magnetic field area to be detected; the electron beam spot information is used for determining magnetic field change information of the to-be-detected magnetic field area. The electronic pulse provided by the invention is used as an electronic probe with time resolutions of picosecond magnitude, nanosecond magnitude, microsecond magnitude, millisecond magnitude and the like, the change process of a magnetic field in a passing magnetic field region to be detected can be detected, and then magnetic field detection with a wider time scale can be realized. Through the magnetic field detection method provided by the invention, the coverage range of the time resolution is expanded, the blank of time scale measurement technology below nanosecond magnitude can be further effectively filled up, and the technical problem that the detection time scale range of a traditional ultrafast magnetic field detection method is narrow is solved.

The invention belongs to the technical field of water body radioactivity detection devices, and discloses a water body NaI (T1) detector with a temperature peak position correction function, and a NaI (T1) scintillator is used for converting gamma rays into optical signals; a crystal shell of the NaI (T1) scintillator is provided with a thermometer; the photomultiplier is used for converting the optical signal into photoelectrons and multiplying the photoelectrons; the high-voltage module is used for providing voltage for the photomultiplier; the temperature correction module is used for storing a temperature-high-voltage gain curve, adjusting high-voltage gain and stabilizing the spectrum in real time; the pre-amplifier is used for amplifying the electronic pulse; the multichannel analysis module is used for converting the pulse signal into a digital signal, carrying out statistical calculation on a pulse amplitude to obtain gamma energy spectrum data, and carrying out secondary spectrum stabilization through a characteristic peak; according to the invention, through real-time temperature monitoring and high-voltage gain dynamic adjustment, in combination with 40K characteristic peak auxiliary calibration, the problem of energy spectrum peak drift in a water body low background environment is solved, and real-time spectrum stabilization can be carried out on the detector.

Electronic generator of pulse signals under modulated carrier and associated radio frequency signal transmitter This electronic generator of pulse signals under modulated carrier includes a module (15) for modulating a pulse train whose position and amplitude are controllable, forming a switching signal (S3); a switching module (16), connected at the output of the pulse train modulation module (15), comprising at least one transistor (22), controlled by said switching signal (S3); a voltage-controlled frequency-locked oscillation module (18), having a frequency-locked band around a free oscillation frequency controlled by a control voltage, connected at the output of the switching module (16); the switching module allowing the injection of a periodic pulse signal (S4) having a frequency spectrum comprising at least one frequency line in said frequency-locked band.This arrangement allows the output of the oscillation module to produce pulsed signals (S5) with a modulated carrier controlled in frequency, phase, and amplitude. See Figure 1 for abbreviations.