40results about "Radiation particle tracking" patented technology

A detector system for molecular imaging of a radionuclide comprises a 3D semiconductor detector comprising a plurality of sensor stacks of sensors made of a semiconductor material having an average atomic number Z below 40. A read-out circuitry connected to the pixels is configured to output, for each interaction induced by an incident gamma ray in the detector, a signal representative of a time, a position and an energy of the interaction in the detector. The interactions in the detector belonging to a same event induced by the incident gamma ray are predicted based on the output signals and used to estimate a direction of the incident gamma ray and reconstruct an image based on the estimated directions of incident gamma rays.

The invention discloses a muon monitoring device and a tunnel monitoring method thereof.The muon monitoring device comprises multiple layers of muon detection modules which are arranged in a laminated mode in the height direction, and each layer of muon detection module comprises a shell, a scintillator array, an optical reflection shielding layer, a front-end signal processing plate and a signal leading-out plate, and the scintillator array, the optical reflection shielding layer, the front-end signal processing plate and the signal leading-out plate are arranged in the shell; the scintillator array is arranged between the optical reflection shielding layer and the front-end signal processing board, and the front-end signal processing board of the muon detection module on the upper layer and the optical reflection shielding layer of the muon detection module on the lower layer of two adjacent layers are arranged oppositely, the scintillator array comprises a plurality of scintillator units arranged in a two-dimensional matrix mode, a photomultiplier is arranged at the bottom of each scintillator unit, the photomultipliers are fixedly installed on the front-end signal processing board, and the front-end signal processing board is in signal connection with the signal leading-out board arranged at the edge of the scintillator array.

The invention discloses a muon track reconstruction method and imaging method based on a muon detector, and the method comprises the following steps: S1, according to the numbers of a first scintillator, a second scintillator and a third scintillator hit by the muon in any muon breakdown event, determining the number of the first scintillator, the number of the second scintillator and the number of the third scintillator; determining azimuth angles of the first scintillator, the second scintillator and the third scintillator hit by the muon; s2, according to the azimuth angle of the first scintillator hit by the muon, the x-axis coordinate value and the y-axis coordinate value of the incidence point and the emergence point of the muon are determined; according to the azimuth angle of the second scintillator hit by the muon and the azimuth angle of the third scintillator hit by the muon, respectively determining z-axis coordinate values of an incidence point and an emergence point of the muon; and S3, determining the track of the muon according to the x-axis coordinate value, the y-axis coordinate value and the z-axis coordinate value of the incidence point and the emergence point of the muon. Compared with the prior art, the method has the advantages that the accuracy of z-axis positioning is remarkably improved while high detection efficiency is kept, so that the accuracy of muon track reconstruction and ore body imaging is improved.

The invention discloses a muon detector with variable scintillator spacing, which comprises a supporting base, and a bottom plate is arranged at the upper end part of the supporting base; the lower-layer detection part is fixedly arranged at the end part of the bottom plate, a multi-stage mechanical telescopic mechanism is arranged on the bottom plate, and an upper-layer detection part is arranged at the end part of the multi-stage mechanical telescopic mechanism; the main control data acquisition system is electrically connected with the multi-stage mechanical telescopic mechanism, the upper-layer detection part and the lower-layer detection part, and is used for setting and acquiring a distance value between the upper-layer detection part and the lower-layer detection part; and calculating according to the collected real-time spacing value, and performing corresponding data correction and image reconstruction according to the effective detection range and the optimal detection area under the current configuration. According to the method, the spatial resolution and the counting rate can be dynamically adjusted, so that the performance limitation caused by a fixed spacing design is broken through, and the comprehensive efficiency in a complex detection task is remarkably improved.

This invention discloses a muon detector and a muon localization method and track reconstruction method, comprising a first scintillator layer, a second scintillator layer, and a third scintillator layer. The first scintillator layer includes multiple annular first scintillators stacked vertically in a cylindrical shape. The second scintillator layer includes multiple elongated second scintillators spirally and tightly wound around the outer wall of the first scintillator layer. The third scintillator layer includes multiple elongated third scintillators extending vertically, distributed circumferentially along the outer wall of the second scintillator layer. Compared with the prior art, this invention can improve the axial positioning accuracy of the muon detector, increase the detection range, and shorten the imaging time without increasing the complexity of the muon detector. Furthermore, it can perform geometric consistency discrimination for false triggering, crosstalk, or inconsistent combination events, thereby improving positioning stability and reliability.

The application provides a synchronous accelerator multi-harmonic beam trajectory reconstruction method and system, and relates to the technical field of accelerators. The method comprises the following steps: obtaining an accelerating cavity high-frequency signal of the synchronous accelerator, so as to generate a frequency-synchronized reference waveform according to the accelerating cavity high-frequency signal; setting a phase trigger window based on the reference waveform, so as to control the synchronous acquisition of beam signals of a full ring of the synchronous accelerator by a beam diagnosis device of the full ring; performing time domain analysis on the beam signals to obtain an effective beam signal interval, so as to calculate position data of the beam signals based on the effective beam signal interval; and reconstructing the motion trajectory of the beam according to the position data of the beam signals, which can accurately identify and associate the data of the same beam in the multi-harmonic acceleration process.

The application belongs to the technical field of space plasma environment detection, and particularly relates to a device and method for measuring particle composition and incident direction, which comprises: a detection unit array, which is respectively provided with a plurality of independent charge input channels in an inner circumferential direction and an outer circumferential direction; each charge output channel is used for outputting different initial charge pulse signals in the inner circumferential direction and different terminal charge pulse signals in the outer circumferential direction after a space charged particle is incident at an incident angle, and delay and amplification are performed respectively; and a back-end circuit analysis processing module, which is used for obtaining actual time of flight and actual incident azimuth angle time of the charged particle according to different initial pulse signals and terminal pulse signals collected for each charge output channel, obtaining the composition of the charged particle according to the obtained actual time of flight of the charged particle, and obtaining the actual incident azimuth angle of the charged particle according to the actual incident azimuth angle time.

The invention relates to the technical field of detectors, and discloses a muon momentum reconstruction method based on particle tracks, which comprises the following steps of: 1, researching and developing an efficient energy detector, and processing position information of muons by adopting Kalman filtering and a REST framework in a gas time projection chamber so as to improve the energy measurement accuracy; 2, introducing a dynamic energy measurement algorithm, developing a self-adaptive algorithm, adjusting energy measurement parameters according to real-time feedback, optimizing muon energy estimation by using Kalman filtering, and reducing background noise influence at the same time; 3, realizing multi-detector array integration, designing a multi-detector array with reasonable layout, ensuring synchronous data acquisition, and enhancing the reliability of a measurement result by using cross validation; 4, data analysis is conducted through the machine learning technology, and a machine learning model is constructed and trained. According to the method, the energy of incident muons is estimated through Kalman filtering, the energy of the muons is screened when the muon scattering imaging technology is applied, and the imaging precision is improved.

The invention discloses a VLBI measurement multi-epoch data fitting and visualization method based on a regression voltage regulation stripping algorithm. The method is suitable for identification and matching of a radio astronomical jet flow component trajectory. The method comprises the following steps: firstly, reading multi-epoch observation data and carrying out self-adaptive preprocessing to extract effective data; the core is to strip an entanglement component through double-loop iterative fitting; a main loop identifies a local trajectory mode based on sampling point pseudo normal distribution; in the secondary cycle, a curve is fitted through orthogonal distance regression, extrusion-fine tuning is carried out by utilizing an adjustable cycle gain and a dynamic threshold value, and the corresponding relation of components among multiple epochs is automatically matched. According to the method, non-uniform sampling and linear and non-linear trajectories can be processed, and finally fitting parameters, physical quantities, a corresponding relation table and a multi-subgraph visualization result integrating fitting curves, residual errors and probability distribution are output. The whole process is highly automatic, false components are effectively eliminated through cross validation, the precision and efficiency of jet flow motion characteristic analysis are remarkably improved, and subjective errors are reduced.

The application discloses a silicon pixel in-diameter track detector service structure with high heat dissipation capacity and high integration degree and a mounting method thereof, which comprises a service bucket, a four-claw flange, a fixing ring, a cable output bucket, a composite sleeve ring and a heat dissipation bucket. The service bucket is composed of a variable-diameter conical half bucket, the front end of which is connected with the composite sleeve ring, and the rear end of which is connected with the fixing ring; the claw arms of the four-claw flange are rigidly connected with the service bucket; the cable output bucket is quickly assembled with the fixing ring and is used for combing and fixing cables and cooling pipelines; the heat dissipation bucket is fixed to the inner wall of the service bucket, and a closed flow channel is arranged in the heat dissipation bucket and forms a closed water cooling cavity with the inner wall of the service bucket. The three-section coaxial heat dissipation bucket and the water cooling circulation loop are adopted in the application, the variable-diameter service bucket and the annular hollow combing plate are combined, the unification of high heat dissipation capacity and high integration degree is realized, the limit performance requirement of a super silicon in-diameter track detector can be met, and the stable and high-precision operation of the detector in an extreme environment with high brightness and strong radiation can be ensured.

The invention belongs to the technical field of space environment detection, and relates to a high-resolution azimuth angle parallel detection device, which comprises an anode assembly, a front placing plate and a digital acquisition processing plate, and is characterized in that the anode assembly comprises a top anode plate and a bottom anode plate which are stacked up and down and are divided into a plurality of anode sectors, and anodes on the upper and lower layers are arranged in a staggered manner; the adjacent anodes are positioned on different anode plates to realize physical isolation and suppress crosstalk, each anode output is connected in series with a current-limiting resistor, and a charge signal output by each anode is transmitted to a front amplifier plate through an inter-plate connector; the preamplifier adopts an integrated charge sensitive amplifier, amplifies multiple paths of charge signals output by the anode assembly, outputs multiple paths of digital pulses, and inputs the digital pulses to the digital acquisition and processing board through an inter-board connector; and the digital acquisition processing board performs parallel detection counting on multiple paths of digital pulses output by the pre-amplification board according to scientific data acquisition logic, avoids an electromagnetic interference time period, and periodically packs and outputs the digital pulses to a PC (Personal Computer) end.

The invention discloses a method and a system for measuring the height of a low-altitude aircraft based on muon detection, and the method comprises the steps: deploying a muon detector array on the aircraft for muon event detection, and obtaining the motion trail of muons and the zenith angle of the muons; performing flux calculation and angular distribution statistics on the motion trails of the muons and zenith angles of the muons to obtain muon flux and muon angular distribution characteristic values; and constructing a muon characteristic parameter and height corresponding relation model, matching muon flux and muon angular distribution characteristic values, and introducing external geographical environment parameters to perform inversion calculation to obtain an aircraft height value. According to the method, noise caused by rapid fluctuation of low-altitude atmosphere in muon detection can be suppressed, and the calculation precision of the height value of the aircraft is further improved. The method and system for measuring the height of the low-altitude aircraft based on muon detection can be widely applied to the technical field of flight height measurement.

A method for monitoring precipitation of magnetospheric particles includes detecting charged magnetospheric particles by a particles detector, processing the detection data to associate a respective estimate or measurement of kinetic energy with the detected magnetospheric particles, obtaining a first count value NH associated with a relatively higher estimate or measurement of kinetic energy, obtaining a second count value NL associated with a relatively lower estimate or measurement of kinetic energy, detecting a relative variation of the second count value NL with respect to the first count value NH, determining that an impulsive event of precipitation of charged magnetospheric particles (MPP event) in the magnetosphere occurred, assigning to the MPP event geomagnetic longitude and time, defining one or more groups of MPP events occurred in a time range at a same geomagnetic longitude, and identifying a group of MPP events indicative of an activity of terrestrial origin.

This invention discloses a muon track reconstruction method and imaging method based on a muon detector, comprising the following steps: S1, determining the azimuth angles of the first, second, and third scintillators hit by the muon in any muon penetration event; S2, determining the x and y coordinates of the muon's incident and exit points based on the azimuth angle of the first scintillator; determining the z-axis coordinates of the muon's incident and exit points based on the azimuth angles of the second and third scintillators; S3, determining the muon's track based on the x, y, and z-axis coordinates of the incident and exit points. Compared with existing technologies, this invention significantly improves the accuracy of z-axis positioning while maintaining high detection efficiency, thereby improving the accuracy of muon track reconstruction and ore body imaging.

This invention relates to a data processing method for single-event multi-track detection based on a time projection chamber, belonging to the field of particle track analysis technology. The method includes the following steps: S1: Denoising preprocessing of the original points; S2: Reconstructing and correcting all tracks in the event using three-dimensional iterative Hough transform and weighted least squares method, outputting the linear equation of each track; S3: For a given straight line, calculating the distance from all points in the event to the straight line, setting a distance threshold, and considering points less than the threshold as points located on the straight line, thereby achieving track splitting; S4: Overfitting processing of the split tracks. This invention improves the processing effect of time projection chamber and other particle track detectors on single-event multi-track detection, providing a practical solution for high-energy particle multi-track detection and identification.

The application relates to a kind of beam transverse operating point measurement method and device, method includes: in time sequence to Schottky signal sampling;Current frame power spectrum is obtained based on current frame data;Unified physical frequency axis under current frame target power spectrum is obtained based on current frame power spectrum;Adaptive smoothing filtering is carried out to obtain the smoothed target power spectrum of current frame;The frequency coordinate of the smoothed target power spectrum of current frame is normalized to dimensionless operating point coordinate to obtain the normalized power spectrum of current frame;The normalized power spectrum of current frame is resampled to obtain the resampled power spectrum of current frame;Determine the reference power spectrum of current frame and the reference transverse operating point of current frame;Determine the candidate transverse operating point of current frame;The reference transverse operating point and candidate transverse operating point of each frame in frame sequence are determined by current frame, the preceding several frames of the current frame, and the optimal estimation value of the transverse operating point of the current frame is determined.

A method includes receiving a plurality of data sets, wherein the plurality of data sets includes a measured low-energy electrons that is less than or equal to 1.5 MeV, and wherein the plurality of data sets further includes data associated with solar wind. The method further includes receiving measured data associated with higher electron events of greater than or equal to 2 MeV. In response to a selection of at least two data sets from the plurality of data sets, and further in response to a selection of one or more machine learning (ML) algorithms from a plurality of ML algorithms, and further in response to a selection of a number of window size, a plurality of ML models is generated based on the selections as an input and the measured data associated with higher electron events of greater than or equal to 2 MeV as its output.

The invention relates to a simulation calculation and imaging method, device and equipment for a proton blocking capability, and belongs to the technical field of ionizing radiation calculation. The method comprises the following steps: partitioning incident proton energy, and obtaining a motion step length of a proton in a target substance based on the energy partitioning; in each motion step length, electron blocking capability calculation based on energy partition, nuclear blocking capability calculation based on a nuclear blocking section and compound blocking capability calculation based on a compound element are sequentially carried out, and the total blocking capability in each motion step length is comprehensively obtained, simplified into the same value and stored; and energy loss rate simulation calculation and imaging of the target material for different incident proton energies are realized. The method can effectively improve the precision and efficiency of proton energy loss rate calculation imaging.

The present invention belongs to the field of particle position and energy detectors, preferably proton tracking detectors and residual range detectors in proton imaging systems. The object of the invention relates to a subassembly for a detector for detecting particles, preferably protons, and a detector comprising at least one subassembly. The invention further relates to an imaging system comprising said subassembly and / or detector. The subassembly consists of one layer of scintillating fibers, wherein each fiber within the layer is at least at one end provided with one photon detector, preferably a SiPM. Since each fiber of the subassembly is provided with its own photon detector, there is no need to form fiber bundles and combine them into separate channels for photon detection, which was a significant disadvantage of the currently known solutions.

The application discloses a method for calculating an interplanetary cross scaling coefficient according to particle phase space density correlation characteristics, comprising the following steps: obtaining particle flux sequences of a standard A star and a to-be-scaled B star; under a T89c external magnetic field model, respectively calculating a modified third adiabatic invariant and a second adiabatic invariant of the A star and the B star, and calculating a local magnetic field intensity; performing uniform grid division on time and the third adiabatic invariant, and performing logarithmic uniform grid division on the first adiabatic invariant and the second adiabatic invariant; obtaining a local pitch angle and energy in the grid; screening out points with data in the same grid to obtain particle phase space densities of the A star and the B star respectively; calculating a particle phase space density average in the grid; respectively establishing particle phase space density matrices of the A star and the B star; screening out points with data in the same grid of the particle phase space density matrices of the two stars to obtain a cross scaling coefficient of the B star.

A source emits a pulse to an object to generate a particle, and an imaging detector produces a light flash at an X / Y hit position of the particle. The detector outputs a waveform arising from the particle. An event-driven camera provides a signal from the detector that includes intensity and time-over-threshold signals related to the light flash, time-of-arrival information of the event, and the X and Y hit position of the particle. A photodiode determines a time origin of the pulse from the source. A timing circuit is coupled to the detector and to the photodiode, and determines time-of-flight (TOF) of the particle based on the waveform, and based on the time origin of the pulse. The 3D coordinates are generated based on the X / Y hit position synchronized with the TOF of the particle.

The invention belongs to the technical field of gyrotron adjustment, and particularly discloses a gyrotron system electron beam circulation test method and device. The method is applied to the gyrotron system, the gyrotron system comprises a gyrotron body, the gyrotron body comprises an electron gun area, a resonant cavity area and a collector area, and the method comprises the following steps: when the gyrotron system is in a running state and the gyrotron body meets a first resistance balance condition, starting the electron gun area; respectively acquiring first current data of ground diversion of the collector region and second current data of ground diversion of the electron gun region; performing comparative analysis according to the first current data and the second current data, and determining an electron beam circulation test result of the gyrotron system; wherein the first resistance balance condition is that the sum of the resistances of the collector region and the ground diversion loop is equal to the sum of the resistances of the resonant cavity region, the electron gun region and the ground diversion loop of the electron gun region. According to the invention, the precision of the electron beam circulation test result can be greatly improved, the test effect is stable, and the economic cost is low.

The invention provides a charged particle beam measuring device, a charged particle beam measuring method and semiconductor equipment, and relates to the technical field of charged particle beam application, the measuring device comprises a shielding part, a current collecting array and a current measuring array, the shielding part comprises a shielding part and a plurality of knife edges, and two adjacent knife edges are arranged on the shielding part at intervals; the current collection array is provided with a plurality of absorption cavities, openings of the plurality of absorption cavities are arranged opposite to the shielding piece, and the absorption cavities are used for collecting the charged particle beams and generating current; the current measurement array is located on the side, away from the shielding piece, of the absorption cavity and used for measuring the intensity of the current generated by the current collection array, the current measurement array directly measures the intensity of the current generated by the current collection array, the kinetic energy of the charged particle beam is prevented from being lost in the process of converting the kinetic energy into other energy, and the energy utilization rate of the charged particle beam is improved. The signal-to-noise ratio of a measurement result is improved, the signal acquisition time is shortened, and high-speed and accurate measurement is realized.

The present application relates to nuclear radiation detection and nuclear electronics technical field, specifically to a kind of radiation field dose self-discrimination detection system and method;It contains double-channel signal acquisition circuit, phase space mapping and manifold curvature entropy analysis module;System utilizes original signal and analog differential signal to construct real-time phase space trajectory, and introduces reference particle attractor model;Its core is to calculate trajectory manifold curvature entropy and carry out hierarchical discrimination: low entropy is determined as single particle, high entropy is determined as accumulation distortion and triggers inverse calculation repair process to deconstruct it;Finally, the energy is updated dose library by phase space closed loop volume integral calculation;The present application uses hardware differentiation to avoid digital quantization noise, ensures that trajectory topological surface is smooth, and significantly improves the measurement accuracy under high dynamic range.

The invention discloses a three-dimensional track reconstruction method and device for muon imaging, and relates to the field of signal detection and ray imaging, and the method comprises the steps: obtaining an original waveform signal of muon imaging, and carrying out the preprocessing of the original waveform signal; performing channel waveform analysis on the preprocessed original waveform signal by adopting a waveform identification technology to obtain a channel waveform analysis result; in combination with a detector-electronics channel mapping table, decoding continuous channel information by utilizing hit continuity characteristic channel clustering; on the basis of the continuous channel information, utilizing a spatial point clustering algorithm to take spatially adjacent electronic signals in the continuous clusters as the same electronic cloud cluster; and based on the three-dimensional barycentric coordinates of the plurality of electronic clouds, completing three-dimensional track reconstruction by using a screening reconstruction algorithm. According to the method, the problem of fuzzy reconstruction of a small-angle incident muon example is solved through channel waveform analysis, hit cluster searching and three-dimensional track reconstruction.

A method (100) for monitoring particle deposition in the magnetosphere comprises the steps of: detecting (101) charged magnetospheric particles by means of at least one particle detector (10) installed on at least one satellite vehicle (1) in orbit (3), associating the detected particles with respective detection data; processing (102) the detection data to associate respective kinetic energy estimates or kinetic energy measurements with the detected magnetospheric particles; obtaining a first count value N H (104) relating to the number of charged particles detected over a time period, the first count value being associated with relatively higher kinetic energy estimates or kinetic energy measurements comprised in a first energy range; obtaining a second count value N L (105) relating to the number of charged particles detected over said time period, the second count value N L being associated with relatively lower kinetic energy estimates or kinetic energy measurements comprised in a second energy range; detecting (106) a relative variation value of the second count value N L with respect to the first count value N H ; determining (107) that a pulse event of particle deposition in the magnetosphere - MPP event - has occurred over the aforementioned time period, comparing the aforementioned variation value with a threshold value; assigning (109) to said MPP event the geomagnetic longitude and time at which said MPP event occurred; defining (110) one or more groups of MPP events, each group comprising MPP events occurring over a time range, at the same geomagnetic longitude or at relatively close geomagnetic longitudes; identifying (111) a group of MPP events as indicative of a surface-originated activity, such as a pre-seismic activity or a seismic activity, based on the number of MPP events comprised in the group and / or based on the associated variation value found in the detection step (106).

A computer-implemented method, an apparatus, a computer program product and a sensor are disclosed. The method comprises: acquiring (300) muon flux data measured by one or more muon detectors configured to measure a muon flux through the pipe; detecting (302) an anomaly in the pipe based on the muon flux data; and outputting (304) the detected anomaly.

The application belongs to the technical field of biological materials, and provides a seed embryo heavy ion track acquisition method based on biological stacking, which comprises the following steps: pretreating an initial biological stack to obtain a target biological stack and an initial scanning diagram of the target biological stack; scanning the target biological stack to obtain the initial scanning diagram of the target biological stack; marking the initial scanning diagram based on the center position of the seed embryo for the first time to obtain a target scanning diagram; adhering the target scanning diagram and a detection sheet of the target biological stack to obtain an initial adhering piece, and marking the initial adhering piece on a non-contact surface based on the center position of the seed embryo for the second time to obtain a target adhering piece; scanning the target adhering piece by using a preset laser confocal microscope to obtain an imaging diagram of the seed embryo, and cutting out an actual projection of the seed embryo on a preset projection contour based on the imaging diagram and the center position of the seed embryo in the imaging diagram; and identifying a heavy ion track of the seed embryo according to the actual projection.

The present specification provides a detector for an X-ray imaging system. The detector includes at least one high resolution layer having high resolution wavelength-shifting optical fibers, each fiber occupying a distinct region of the detector, at least one low resolution layer with low resolution regions, and a single segmented multi-channel photo-multiplier tube for coupling signals obtained from the high resolution fibers and the low resolution regions.

An electronic tracking system is provided for solving the problem of electron trajectory loss in long-distance electron transport. A short-distance vacuum target channel is built to simulate the vacuum motion environment of electrons under the action of an external magnetic field (the geomagnetic field). The fluorescent position of the target surface inside the target channel is captured by a camera and uploaded to the host computer for analysis, thereby realizing the tracking of the electron trajectory under the action of the geomagnetic field. First, the motion speed information of the electrons at the accelerator outlet is calculated according to the electron energy. Then, the local geomagnetic field information is measured by a magnetometer. Subsequently, the conversion relationship between the reference coordinate system and a new coordinate system with the direction of the external magnetic field vector as the coordinate axis is established according to the coordinate transformation principle. Finally, the influence of the external magnetic field on the moving electrons is calculated in the new coordinate system, the position of the target electron at the terminal point is determined, and the coordinate transformation is performed to obtain the target electron position in the reference coordinate system. According to the appropriate target electron position, the key indicators such as the length and diameter of the vacuum target channel can be determined.