13 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.

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 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 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.

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.

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.

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.