24 results about "Beam pulse" patented technology

The invention discloses a self-delay double-target collision plasma generating device and method, and belongs to the technical field of plasmas, the self-delay double-target collision plasma generating device comprises a laser system, a vacuum chamber and a target material assembly arranged in the vacuum chamber, and the target material assembly comprises a first composite target and a second plane target in the laser propagation direction; the first composite target comprises a film substrate and a first tin layer; the second planar target comprises a second tin layer; and a preset distance is set between the thin film substrate and the second tin layer. The laser system emits a single beam of pulse laser to be focused on the first composite target, ablates the first tin layer to generate first plasma and breaks down the film substrate, transmitted laser energy ablates the second tin layer to generate second plasma, and the first plasma and the second plasma collide oppositely to form a stagnation layer. The single-beam laser and a special composite target material structure are utilized, self-delay plasma collision is achieved through a physical mechanism, the system structure is simplified, and the constraint performance of a plasma stagnation layer is improved.

To provide a charged particle microscope system for synchronizing various signals.SOLUTION: A method for characterizing a light beam in a charged particle column includes directing a light beam pulse toward a sample in a charged particle column, directing a charged particle beam pulse toward the sample, detecting charged particles that have interacted with the sample based at least in part on the light beam pulse and the charged particle beam pulse, determining a time delay between the charged particle beam pulse and the light beam pulse based at least in part on the charged particles, and determining at least one characteristic of the light beam pulse based at least in part on the time delay.SELECTED DRAWING: Figure 5

The invention relates to a high-current pulse proton accelerator beam synchronous control system and method, belongs to the technical field of particle accelerator control, and solves the problem of high operation risk of a high-current pulse proton accelerator in the prior art. The beam synchronous control system comprises a beam control system, a particle source acceleration power supply system, a particle source extraction power supply system and each high-frequency acceleration cavity system; the beam control system determines a beam mode and a beam pulse width according to a received user beam output instruction, and synchronously sends a boost event code to the particle source acceleration power supply system and a turn-off event code to the particle source extraction power supply system; the particle source acceleration power supply system, the particle source extraction power supply system and each high-frequency acceleration cavity system respectively trigger hard interruption after receiving corresponding event codes, and execute corresponding events in the hard interruption to realize synchronization of beam current and high-frequency feedforward. And the operation risk is reduced.

The invention provides an electron beam information detection method and system and a regulation and control method of an electron emission device, and belongs to the technical field of electron beam detection.The method comprises the steps that to-be-detected electron beam pulses are emitted, and the to-be-detected electron beam pulses pass through a preset changing magnetic field; the time scale of the preset variable magnetic field is set to correspond to the pulse width time scale of the to-be-measured electron beam pulse; and detecting the pulse performance of the to-be-detected electron beam pulse passing through the preset variable magnetic field, wherein the pulse performance is used for determining the stability information of the electron beam under the pulse width time scale of the to-be-detected electron beam pulse. Through the electron beam information detection method provided by the invention, the detection resolution range of the electron beam information is expanded, the method is not limited to the application of femtosecond-order time scale any more, and the technical problem that the detection range of a traditional measurement method based on a microwave deflection cavity is narrow is solved.

To provide a method for mixed signal synchronization for a charged particle column.SOLUTION: A method for mixed signal synchronization for a charged particle column includes: generating an optical pulse signal from a light source that emits optical beam pulses toward a sample in the charged particle column; generating a radio frequency (RF) signal associated with an RF cavity that pulses the charged particle beam toward the sample; generating a composite signal using at least the RF signal and the optical pulse signal; and controlling, based at least in part on the composite signal, at least one of i) the light source or ii) the RF signal for the RF cavity such that the optical beam pulses and the charged particle beam pulses are synchronized at the sample.SELECTED DRAWING: Figure 9

The invention discloses a vacuum insulation design method between accelerator electrodes for a neutral beam negative ion source, which belongs to the field of direct-current high-voltage vacuum insulation, and comprises the following steps: preliminarily designing the shape of an accelerator electrode, calculating the track of electron beam pulse emitted by the surface of a cathode, and evaluating the breakdown possibility on the track of the electron beam pulse. And calculating the track of particles emitted by the anode surface after breakdown, and changing and optimizing the electrode structure according to the calculation result. According to the method, the problems that the vacuum insulation performance between the existing accelerator electrodes is poor and the breakdown position cannot be accurately found by the existing design method are solved, and the accurate and effective vacuum insulation design between the accelerator electrodes is realized.

The application provides a pulse laser and a processing method, comprising: a first oscillator, a pulse shaper and an amplifier; the first oscillator is used for providing a main light beam; the pulse shaper is arranged at an output end of the first oscillator, and is used for modulating the main light beam in a time domain based on a processing depth or shape requirement, so as to generate a seed light beam with a preset pulse width and / or a preset pulse shape; and the amplifier is arranged at an output end of the pulse shaper, and is used for amplifying the seed light beam. The pulse laser and the processing method can realize accurate control of the processing depth, improve the processing speed under the condition of ensuring the processing quality, obtain a large processing depth by using low energy, and further greatly improve the energy utilization rate.

Provided are a FLASH radiotherapy dose control method and apparatus, and an electronic device. The method comprises: calculating the number of delivered pulses of at least two beam pulses having different pulse widths, the total beam delivery time, and the beam repetition frequency of the beam pulses, issuing the beam repetition frequency to a beam generation system, and issuing a set beam termination dose threshold, a pulse conversion dose threshold obtained by means of calculation, and a beam termination time threshold to a beam sampling controller; determining whether a real beam delivery dose is greater than or equal to the pulse conversion dose threshold; determining, on the basis of the determination result, whether to output a level control signal for adjusting the pulse width to the beam generation system; then determining whether the real beam delivery dose is greater than or equal to a beam termination dose threshold, and at the same time, determining whether a real beam delivery time is greater than or equal to the beam termination time threshold; and determing, on the basis of the determination result, whether to output a level control signal for beam termination to the beam generation system. The accuracy of FLASH beam dose control is improved.

This invention discloses a weak target detection method based on adjacent beam pulse accumulation, comprising the following steps: dividing the scanning range of a pulse-based radar into M beam positions; determining the pulse accumulation result A of the received beam i based on the transmitted beam i at the first time t1 and the transmitted beam i+1 at the second time t2. i The pulse accumulation result A of the received beam i+1 i+1 According to the pulse accumulation result A of the received beam i i The pulse accumulation result A of the received beam i+1 i+1 Phase compensation data matrix B i+1 The optimal weighting coefficients of the pulse accumulation results of two adjacent beams are used to determine the data matrix C; target detection is performed on the data matrix C, and the detection results are output. This invention improves the detection performance of pulse-based radar for weak targets by performing coherent accumulation of echo signals from the same target received by adjacent beams at different times. Based on the actual model of adjacent beam signal reception, and according to the maximum signal-to-noise ratio criterion, the optimal weights for coherent accumulation of adjacent beam outputs are calculated.

The invention relates to a pulse charged particle beam dose monitoring system and a monitoring method thereof.The pulse charged particle beam dose monitoring system comprises an ACCT sensor, a signal conditioning module, a high-speed data acquisition module and a data processing and interaction module, the ACCT sensor is installed on a beam vacuum pipeline, and the output end of the ACCT sensor is connected to the signal conditioning module; the output end of the signal conditioning module is connected to the high-speed data acquisition module, and the output end of the high-speed data acquisition module is connected with the data processing and interaction module; the method comprises the following steps: carrying out system calibration to obtain a conversion coefficient k in a preset signal-dose conversion relation; performing dose-time spectrum real-time monitoring and analysis by adopting a system; and obtaining a dose-time spectrum of the charged particle beam. By adopting the system and the method disclosed by the embodiment of the invention, real-time and non-destructive monitoring on the beam pulse time structure and the corresponding dose-time distribution can be realized, so that support and guarantee are provided for accurate dose control and safe treatment.

A LiDAR system includes a laser for delivering a beam pulse comprised of multiple wavelengths that is directed toward and reflected off a target, a dispersive optic for receiving and temporally dispersing wavelengths within the beam pulse, and only one single-pixel sensor for receiving the beam pulse after it has been temporally dispersed and measuring and outputting separate intensity values for the different wavelengths in the beam pulse. The dispersive optic includes a first photonic lantern, a second photonic lantern downstream of the first photonic lantern, and a plurality of single-mode fibers connecting the first and second photon lanterns. At least one of the first photonic lantern, the second photonic lantern, and the plurality of single-mode fibers is configured to provide chromic induced delays and / or fiber-length delays on the different wavelengths in the beam pulse to obtain the desired temporal dispersion consistent with the specific spectral LiDAR spectrum.

A method for mixed signal synchronization for a charged particle column includes generating an optical pulse signal from a light source that emits a light beam pulse towards a sample within the charged particle column, generating a radio frequency (RF) signal associated 5 with a RF cavity that pulses a charged particle beam towards the sample, generating a composite signal using at least the RF signal and the optical pulse signal, and controlling, based at least in part on the composite signal, at least one of i) the light source or ii) RF signals for the RF cavity such that light beam pulses and charged particle beam pulses are synchronized at the sample.

A method for characterizing a light beam within a charged particle lens barrel, the method comprising: directing a light beam pulse towards a sample within the charged particle lens barrel; directing the charged particle beam pulse towards the sample; detecting charged particles that interact with the sample based at least in part on the beam pulse and the charged particle beam pulse; determining a time delay between the charged particle beam pulse and the beam pulse based at least in part on the charged particles; and determining at least one characteristic of the beam pulse based at least in part on the time delay.

A multispectral laser detection and ranging device including a spectral delay unit configured for delaying the broadband laser beam pulse depending on the wavelength, to give a wavelength comb selected in the spectral range, such that the broadband laser beam pulse is transformed into a pulse-train wherein each pulse in the train is at a different wavelength of the wavelength comb.

An aesthetic laser apparatus for performing treatment by irradiating a human skin to be treated by a variable pulsed laser beam is disclosed. This apparatus includes a laser source which emits variable waveform output of treatment laser beam pulses; a flexible beam delivery for delivering the treatment laser beam emitted from the laser source, the flexible beam delivery includes at the distal end automated optical scanner comprising of 2 moving mirrors; and a surgical instrument is connected to an end of the scanner and used for irradiating the treatment laser beam delivered therein to the treatment human skin. By having the ability to vary the laser's output pulse frequency, pulse width, and pulse energy, multiple tissue effects can be achieved using one laser surgical apparatus.

A method for mixed signal synchronization of a charged particle lens barrel includes generating a light pulse signal from a light source emitting light beam pulses to a sample within the charged particle lens barrel; generating a radio frequency (RF) signal associated with a radio frequency (RF) cavity that emits a pulse of a charged particle beam to the sample; generating a composite signal using at least the RF signal and the optical pulse signal; and controlling at least one of i) the light source or ii) the RF signal for the RF cavity based at least in part on the composite signal to synchronize the beam pulse and the charged particle beam pulse at the sample.

The application relates to the technical field of particle acceleration, and particularly discloses a high-repetition nanosecond beam pulsing system and method, wherein the high-repetition nanosecond beam pulsing system comprises, in sequence along a beam transmission direction, a direct current ion source, a low-energy beam transmission section, a radio frequency quadrupole field accelerator, a high-energy beam transmission section and a target chamber, adopts a three-stage structure of 'front-end pulsing + middle-stage acceleration + rear-end purification', and is helpful to stably realize high-repetition, nanosecond narrow pulse width output; through pre-chopping and post-bunching, the pulse width is ensured, and invalid particles are reduced to enter a subsequent acceleration channel; the working frequency of the radio frequency chopper is half of the target pulse repetition frequency, the difficulty of synchronous control can be reduced, time sequence accuracy and phase synchronization can be ensured, beam loss and phase disorder can be avoided, pulse time sequence consistency can be ensured, and beam utilization rate can be improved; and the high-repetition nanosecond beam pulsing is stably ensured.

A method for operating a LIDAR device by a control unit is provided. At least one beam pulse is emitted into a sampling range by a beam source, and beams that are reflected and / or back-scattered from the sampling range are received by a detector that includes multiple single-photon avalanche diode (SPAD) cells, and converted into electrical counting pulses. The at least one beam pulse is generated with a lengthened falling intensity edge, and the detector is read out by a DC-coupled readout electronics system. Moreover, a control unit and a LIDAR device are provided.

A method for mixed signal synchronization for a charged particle column includes generating an optical pulse signal from a light source that emits a light beam pulse towards a sample within the charged particle column, generating a radio frequency (RF) signal associated with a RF cavity that pulses a charged particle beam towards the sample, generating a composite signal using at least the RF signal and the optical pulse signal, and controlling, based at least in part on the composite signal, at least one of i) the light source or ii) RF signals for the RF cavity such that light beam pulses and charged particle beam pulses are synchronized at the sample.

Charged particle beam apparatus includes: a charged particle optical system to irradiate a sample with a pulsed charged particle beam; an optical system to irradiate the sample with light; a detector configured to detect a secondary charged particle emitted by irradiating the sample with the pulsed charged particle beam; a control unit configured to control the charged particle optical system to irradiate the sample with the pulsed charged particle beam under a predetermined electron beam pulse condition, and control the optical system to irradiate the sample with the light under a predetermined light irradiation condition; and a computation device configured to set the predetermined light irradiation condition based on a difference between a secondary charged particle signal amount detected under a first electron beam pulse condition and a secondary charged particle signal amount detected under a second electron beam pulse condition different from the first electron beam pulse condition.

This invention discloses a device and method for generating a 100-femtosecond pulse-length free-electron laser based on electron beam cutting. The device includes: an electron beam generating device, an electron beam accelerating device, a beam focusing device, an electron beam cutting device, a free-electron laser generating device, an electron beam pulse length measuring device, and a free-electron laser measuring device. This invention can cut an electron beam into a 100-femtosecond electron beam using the electron beam cutting device, thereby obtaining a 100-femtosecond pulse-length free-electron laser. This free-electron laser has good quality and can be used for experimental research on the 100-femtosecond timescale.

The application discloses a self-delayed double-target collision plasma generating device and a generating method, and belongs to the technical field of plasma, which comprises a laser system, a vacuum chamber and a target assembly arranged in the vacuum chamber, wherein the target assembly comprises a first composite target and a second plane target along the laser propagation direction; the first composite target comprises a film substrate and a first tin layer; the second plane target comprises a second tin layer; and a predetermined interval is arranged between the film substrate and the second tin layer. The laser system emits a single-beam pulsed laser focused on the first composite target, ablates the first tin layer to generate a first plasma, breaks through the film substrate, transmits the laser energy to ablate the second tin layer to generate a second plasma, and the first plasma and the second plasma collide with each other to form a stagnation layer. The application utilizes a single-beam laser and a special composite target structure to realize self-delayed plasma collision through a physical mechanism, simplifies the system structure and improves the confinement performance of the plasma stagnation layer.

The present application belongs to the technical field of laser processing, and relates to a laser composite processing method for an inclined deep hole, comprising the following steps: a laser path scanning system controls a first short pulse laser beam to remove processing layer by layer from top to bottom along a hole axis until a flat area perpendicular to the hole axis is formed by removing an inclined part of a workpiece; a laser processing head emits a long pulse laser beam pulse train to process the flat area, forming a through hole with a minimum cross-sectional size smaller than that of a target hole; and the laser path scanning system controls a second short pulse laser beam to remove processing from top to bottom along the hole axis until a complete hole fully corresponding to the three-dimensional size of the target hole is processed. The method can realize the processing of an extreme inclined hole with an included angle β between the axis of the target hole and the normal of the hole surface being greater than 70°, and simultaneously adopts a three-step composite method of short pulse laser-long pulse laser-short pulse laser, giving consideration to processing quality and processing efficiency, and can realize the processing of equal-diameter holes and variable-diameter special-shaped holes.

A method for layer-wise additive manufacturing of a shaped body made up of slices of processed layers, including the steps:creating a layer of a slurry, the slurry including binder, a dispersing medium and a particulate filler material,solidifying the slurry layer,directing electromagnetic radiation to the solidified layer for processing it by debinding and / or sintering, andrepeating the above-mentioned steps to successively build the shaped body.A laser induced forward transfer (LIFT) process utilizing a laser to direct laser beam pulses acts on a coating of slurry on a carrier to transfer droplets of slurry to a receptor surface to create the slurry layer which is then processed further by above-mentioned steps of solidifying, and debinding and / or sintering.