45 results about "Beam pulse" patented technology

A cup to hold liquid Xe is disposed in a vacuum chamber. The cup has an open top. A piezoelectric transducer is disposed in the cup to generate acoustic waves through the liquid Xe in the cup. The acoustic waves create liquid Xe droplets that fly out of the cup. A laser may generate laser-beam pulses, which are focused by optics onto respective liquid Xe droplets that have flown out of the cup, to generate EUV light.

This invention discloses a pulsed laser deposition apparatus and its deposition method, comprising a frame, an internal coating vacuum chamber, a target cylinder, and a cathode target mounted on the target cylinder. The frame is equipped with a target cylinder rotation drive mechanism for driving the target cylinder to rotate. The coating vacuum chamber contains a substrate transfer device. The apparatus also includes a wide-line-beam pulsed laser and a reflector that works in conjunction with the wide-line-beam pulsed laser. The wide-line-beam laser beam is reflected by the reflector and then irradiates the axial surface of the cathode target facing the substrate. This apparatus utilizes the coordination of the wide-line-beam laser beam and the target movement. The uniformity of the film thickness in the direction parallel to the target is ensured by the consistency of the wide-line-beam laser distribution, and the uniformity of the film thickness in the direction perpendicular to the target is ensured by the uniformity of the substrate movement speed.

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.

A method for treating dental hard tissue to decrease sensitivity by occluding dentin tubules. A CO2 laser source generates a pulsed laser beam having a wavelength of 9-11 microns. A laser beam width is defined and the pulsed laser beam focused at or near the dental hard tissue. A pulse energy is controlled with at least one beam pulse having a fluence profile in a working range of the laser beam having: a maximum local fluence less than a minimum fluence that causes damage of the dental hard tissue, and at least one other local fluence greater than a fluence that causes a minimum amount of occlusion of the dentin tubules. The pulsed laser beam is directed to respective dental hard tissue locations to occlude the dentin tubules, without delivery of cooling fluid while directing the pulsed laser beam to respective tissue locations.

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.

The present invention relates to a multipoint optical measurement device (1) comprising a source (2) for the emission of laser pulses, at least two separation modules (4) intended to be traversed by said pulses and to separate an incident laser beam (7) into several parallel beams (8), at least one convergence optic (5) which is interposed between the source (2) and the separation module (4), a measurement zone (6) which is intended to receive a medium or a sample to be measured (10) and which is located in a focal plane (16) of said convergence optic (5), each separation module (4) comprising on the one hand a first uniaxial birefringent crystal and on the other hand a second identical crystal disposed after the first crystal in the path of the pulses, the first birefringent crystal being configured to separate an incident laser beam (7) into an ordinary secondary beam and an extraordinary secondary beam,the second birefringent crystal being oriented with respect to the first crystal such that the extraordinary secondary beam from the laser beam (7) traverses an ordinary path of the second birefringent crystal, and the ordinary secondary beam from the laser beam (7) traverses an extraordinary path of the second birefringent crystal, the pulses of the beams (8) at the output of the modules (4) simultaneously and at multiple points (9) reaching the medium or the sample to be measured (10). Figure for the abstract: Fig. 1,

A cup to hold liquid Xe is disposed in a vacuum chamber. The cup has an open top. A piezoelectric transducer is disposed in the cup to generate acoustic waves through the liquid Xe in the cup. The acoustic waves create liquid Xe droplets that fly out of the cup. A laser may generate laser-beam pulses, which are focused by optics onto respective liquid Xe droplets that have flown out of the cup, to generate EUV light.

A method for the material-removing machining of a workpiece by laser beam pulses. The laser beam pulses are directed to impact points on the surface of a volume to be removed of the workpiece in order to cut away material from the volume to be removed. Cutting away the volume to be removed results in a new contour surface to be produced on the workpiece. An impact angle of the laser beam pulses relative to the contour surface to be produced is set in accordance with a predefined condition during the removal of at least part of the volume to be removed that directly adjoins the contour surface to be produced. According to this condition, the impact angle is the same as a threshold angle (as), or somewhat smaller.

A method for tuning temporal overlap between a pulsed charged particle beam and a pulsed optical beam includes directing pulses of the pulsed charged particle beam to impinge an area of a screen. A property of the screen changes as a result of interaction with the pulsed charged particle beam. The method also includes temporally scanning a delay between the pulsed optical beam and the pulsed charged particle beam. The method further includes while temporally scanning the delay, repeatedly measuring the property of the screen. The method further includes determining, based on the repeated measurements of the property of the screen, a temporal relationship between the pulsed charge particle beam and the pulsed optical beam. The method further includes tuning, based on the temporal relationship, the delay between the pulsed optical beam and the pulsed charged particle beam.

The invention discloses an accelerator output energy adjusting method and device, equipment and a storage medium. By adjusting one or more of the current of the electron gun, the width and the amplitude of pulse current output by the magnetron modulator, the current of the magnetron magnet and the phase relation between electron beam pulse emitted by the electron gun and microwave pulse of the magnetron, the ray energy and the dose rate output by the accelerator are changed to meet the requirements. According to the invention, various ray energies and dose rates with different sizes can be output, and the requirements of multiple energies and accurate positioning of the accelerator are met.

The invention relates to a low-yield and ultra-fast pulse gamma ray beam pulse width monitoring system and method, in particular to a low-yield and ultra-fast pulse gamma ray beam pulse width monitoring system and method based on back scattering array coincidence detection, and solves the problem that an existing system is difficult to meet the requirement for online real-time monitoring of output pulse width during an LCS beam experiment. The system comprises a scattering target, a coincidence detector array, a coincidence data processing circuit and a power supply circuit for providing a stable power supply, the scattering target is arranged in the beam direction of the pulse gamma ray device; the coincidence detectors are distributed on a ring with the optical axis of the pulse gamma ray device as the central axis. Each coincidence detector comprises a detector shell, and a scintillator crystal, a light guide layer, a silicon photomultiplier SiPM and a SiPM high-frequency readout circuit which are arranged in the detector shell and are connected in sequence; the output end of the SiPM high-frequency reading circuit is connected with the input interface of the coincidence data processing circuit, and the pulse width is obtained and output through the coincidence data processing circuit.

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.

The present invention discloses a deuterium beam pulse modulation device and a pulse neutron generator, including a fixing bolt and a mounting seat, wherein a sliding cavity is provided inside the mounting seat, a sliding hole is provided at one end of the mounting seat, one end of the fixing bolt passes through the sliding hole and is located in the sliding cavity and fixedly connected to a circular plate, the outer wall of the mounting seat is sleeved with a coil fixing cylinder, the fixing cylinder does not contact the mounting seat, a gap channel is provided between the coil fixing cylinder and the mounting seat, the inner wall of the coil fixing cylinder is located in the gap channel and fixedly connected to a pulse magnetic field modulation coil, the coil fixing cylinder is fixedly connected to an anode sleeve near the edge of one end of the fixing bolt, and the end of the coil fixing cylinder is fixedly connected to a metal electrode ring. The present invention has a compact structure and a simple power supply method, can effectively improve the deuterium ion yield and proportion, and can also widen the beam pulse waveform to obtain a better flat-top pulse waveform, providing effective guarantee for subsequent use in a pulse neutron generator device to obtain a small beam spot and a high neutron yield.

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.

The invention relates to the technical field of electronic packaging, in particular to a preparation method and application of an all-intermetallic compound film. Comprising the following steps that (1) in an inert atmosphere, a double-target double-beam pulse laser deposition technology is adopted to deposit a metal particle film on the surface of a wafer, and a main target and an auxiliary target selected for deposition are both made of metal; in the initial deposition stage, the heating temperature of the wafer is 260-300 DEG C, and the air pressure is 50-500 Pa; in the later stage of deposition, the heating temperature of the wafer is 220-260 DEG C, and the air pressure is 500-1500 Pa; and (2) carrying out heat treatment on the deposited wafer to obtain the full IMC film covering the surface of the wafer. According to the preparation method provided by the invention, the deposition speed of full IMC film preparation can be increased, the film quality can be improved, the energy consumption and the equipment complexity can be greatly reduced, and the reliability and the performance stability of a device can be remarkably improved when the prepared full IMC film is applied to electronic packaging.

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.

The present invention provides a FLASH radiotherapy dose control method, device and electronic equipment, comprising: calculating the number of beam outputs, the total beam output time and the beam output frequency of beam pulses of at least two different pulse widths, and sending them to a beam generating system, and sending the set beam stop dose threshold and the pulse conversion dose threshold and beam stop time threshold obtained by calculation to a beam sampling controller; judging whether the actual beam output dose is greater than or equal to the pulse conversion dose threshold, judging whether to output a level control signal for adjusting the pulse width to the beam generating system according to the judgment result, then judging whether the actual beam output dose is greater than or equal to the beam stop dose threshold, and judging whether the actual beam output time is greater than or equal to the beam stop time threshold, and judging whether to output a level control signal for stopping beam output to the beam generating system according to the judgment result, thereby improving the accuracy of FLASH beam dose control.

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.

A laser emission assembly of the underwater laser detection equipment comprises a plurality of emission sources and a wavelength beam combiner, each emission source emits different laser beams to the wavelength beam combiner at a repetition frequency, and the wavelength beam combiner combines the laser beams to form a combined beam; the pulse selection assembly is arranged in the irradiation direction of the combined light beam so as to form a pulse selection light beam emitted outwards; the receiving assembly comprises an acquisition structure and an analysis structure so as to analyze an echo light beam or an echo signal generated after the pulse selection light beam irradiates the underwater target object. According to the invention, the problems that when the laser beam is propagated in water, the laser beam is influenced by absorption and scattering, so that the reflection of the laser and the effect of collecting the reflected beam are greatly interfered, the influence of water body scattering is serious, and the distance measurement or imaging of the target object cannot be accurately carried out are effectively solved.

There is provided a system, method, and lighting module for fast-moving particle characterization. The lighting module can include a light source directed at the particles to generate a light beam of incoherent or semi-coherent light; and a pulse generator connected to the light source to direct the light source to generate the light beam when in receipt of a trigger signal, the pulse including a time period on a nanosecond scale. In some cases, the light beam can be conditioned with optical elements into a homogeneous flat-top profile. In some cases, the trigger signal is generated by a camera module, which is passed through a synchronization board to compensate for any noise.

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.