41 results about "Proton energy" patented technology

The invention discloses a medical proton linear accelerator. The medical proton linear accelerator comprises an ECR ion source, an RFQ accelerator, an SDTL and a traveling wave proton accelerator which are connected in sequence; a separated type drift tube linear accelerator, namely SDTL, is adopted in an intermediate energy acceleration section; the traveling wave proton accelerator is adopted in a high energy acceleration section, so that the medical proton linear accelerator is more compact in structure and smaller in occupied space; the energy of the emitted proton beams can be continuously adjustable within a rang of 70-250MeV, so that the requirement of adjusting energy of different beams in a patient body due to different tumor positions in tumor treatment can be satisfied; in addition, the SDTL and the traveling wave proton accelerator both adopt a structure which is formed by multiple sections connected in sequence, and can be constructed in different periods and different stages, so as to satisfy requirement on proton energy of different hospitals; and energy upgrading also can be performed according to treatment demands in post periods.

An improved ³He nuclear reactor with provision for direct electric conversion of a relativistic proton stream into useable electric power at a voltage level compatible with the national power grid (one million V DC). Various embodiments include multiple collector cages for extracting relativistic protons of various energy levels, diverter wires for deflecting high-energy proton streams to either side of lower energy cages to avoid unwanted impact. Other embodiments include arrangements for dividing multi-megavolt voltages down to a useable one megavolt level compatible with the national power grid. Further embodiments comprise guiding the proton stream by the cusps of magnetron cavities to permit conversion of the relativistic proton energies into microwave power. A proposal is also made for harvesting ³He from the Moon to supply earth-bound and space-bound reactors. A solution to the problem of charging a potential well-forming anode in an electrostatic fusion reactor without electrical arcing is further disclosed.

The invention discloses a neutron capture therapy system, being applicable to different targets, in particular comprising: a proton beam; a neutron generating part including a detachable target material on which a neutron beam is generated by proton beam bombardment; a beam shaping body for adjusting the neutron beam to conform to the treatment standard, comprising a moderator, a beam filter, a collimator, a target material of lithium or beryllium, a proton beam energy of a fixed value, a moderator, a reflector, a collimator and a beam filter of a fixed value in length and width; the target material can be replaced in lithium target and beryllium target without changing the energy of proton beam and the size of beam shaper. As a result, the neutron capture treatment system can be simultaneously applied to a lithium target and a beryllium target. When the target material is replaced by a lithium target or a beryllium target, the proton energy and the beam shaping body structure do not need to be changed, and the emitted neutron beam can still meet the irradiation requirements, so as to effectively treat the patient.

The invention relates to a heavy ion testing data based device proton overturning cross section retrieving method. The method comprises the following steps that proton energy is confirmed; the material type and the thickness of a metal wiring layer and an oxidation layer of a device are confirmed; materials and the thickness of a sensitive area of the device are confirmed; an energy deposition differential spectrum of a proton in the sensitive area is analyzed; the energy deposition differential spectrum in the sensitive area is converted into an equivalent LET differential spectrum; the overturning cross section of the device under the proton irradiation is calculated. The influence of the nuclear reaction in the metal wiring layer and the oxidation layer of the device is considered, the method is more suitable for a device under a modern technological condition, the calculation of the influence exerted on the proton by the device is more accurate, and the reliability is greatly enhanced.

The invention provides a fast neutron imaging system. The fast neutron imaging system comprises a neutron conversion screen, a mirror, an image detector, an optical adjustment frame, a camera obscura,a shielding module and a computer control system, wherein the neutron conversion screen, the mirror, the image detection and the optical adjustment frame are arranged in the camera obscura, and the shielding module is arranged at one side, facing a neutron beam, of the camera obscura; the neutron conversion screen comprises a neutron-proton conversion layer, a proton energy selection layer, an electron multiplication layer and a fluorescent layer; the image detector adopts a silicon photomultiplier tube array or an image enhancement CCD camera; the optical adjustment frame comprises a first translation stage and a second translation stage; one end of the first translation stage is provided with the mirror, the other end of the first translation stage is connected with a second translationstage, and the second translation stage is provided with the image detector opposite to the mirror; the computer control system remotely controls the movement of the first translation stage and second translation stage. The fast neutron imaging system has the advantages that the structure is simple and compact, and the imaging requirements of different views fields and resolutions can be met.

The present invention discloses a conical cylinder shaped magnet based proton magnetic spectrometer. The proton magnetic spectrometer comprises a collimating slit, a conical cylinder shaped magnet device and a CR39 medium, wherein the collimating slit is used for introducing protons and filtering protons with relatively large horizontal divergence angles; the conical cylinder shaped magnet device comprises an outer shell, an inner shell, and permanent magnets which are fixed between the outer shell and the inner shell and are distributed radially; a space surrounded by all the permanent magnets forms a magnetic field loop capable of enabling the motion direction of filtered protons to be deflected; and the CR39 medium is used for recording proton signals after deflection so as to obtain proton energy spectrum information. The conical cylinder shaped magnet based proton magnetic spectrometer disclosed by the present invention is reasonable in structure, ingenious in design and small in volume, well solves the technical defects of large volume, low magnetic field strength and nonuniform magnetic field distribution of an existing proton magnetic spectrometer, and realizes effective acquisition of proton signals, therefore, the conical cylinder shaped magnet based proton magnetic spectrometer disclosed by the present invention is suitable for popularization and application.

The invention provides a ground simulation test method of a spatial comprehensive environment effect of a polymeric material used for spacecraft, and relates to the field of a spatial environment effect. The invention aims to solve the problem that the prior art is lack in the adoption of a ground simulation test to conduct comprehensive study on a polymer and a composite material thereof which affect a spatial spacecraft with single coefficient and multiple coefficients. The purpose of ground simulation of the spatial comprehensive environment effect of the polymer and the composite material thereof is achieved by choosing control vacuum degree and control thermal cycle temperature, adding electron energy and flux, proton energy and flux and heavy ion and flux simultaneously into a sealing cavity body or adding the electron energy and flux, the proton energy and flux and the heavy ion and flux in sequence. The ground simulation test method of the spatial comprehensive environment effect of the polymeric material used for spacecraft is used for ground simulation of the degree that the polymer material is damaged by the spatial comprehensive environment.

The invention discloses a compact single-chamber proton therapy system which comprises a superconducting cyclotron system, an energy-reducing device system, a beam-flow conveying system, a scanning treating head system, a patient support system and a treatment plant; the superconducting cyclotron system generates fixed energy and proton beam flows in a certain flow intensity range, the proton energy is continuously adjustable in the range of 70-200MeV via the energy-reducing device system, the beam-flow conveying system guides the proton beam flows from the energy-reducing device system to thescanning treating head system; the scanning treatment head system is used for implementing a scanning scheme according to the treatment plan, adjusts the transverse position of the proton beam flows,and realizes the two-dimensional scanning of the beam flows. The patient support system supports, fixes and positions the patient, and cooperates with the superconducting cyclotron system, the energy-reducing device system, the beam-flow conveying system and a scanning treatment head system for realizing three-dimensional conformal and dose-modulated proton therapy. The device is good in innovation, high in practicability and compact in structure, and the construction site and cost of the proton therapy system can be reduced while the treatment effect is guaranteed.

The invention relates to a test method for measuring the low-energy proton single-event upset sensibility of a nanoscale device. According to the method, the correlation of the direction of incident protons and the direction of the channel width of the device is considered; a proton incident direction as well as an angle selection method and determination principle are provided in a low-energy proton single-event test; a metal film coarse adjustment energy reduction and air layer fine adjustment energy reduction-combined proton energy selection and acquisition method is provided; the thickness of a metal film layer and the thickness of an energy reduction air layer are obtained; and therefore, energy required by the low-energy proton single-event test can be obtained, a component for astronavigation can be realized, low-energy proton single-event effect evaluation of high-integration and small-characteristic size deep submicron and nanoscale devices can be realized, and needs for satellite anti-radiation reinforcement design can be satisfied to the maximum extent. With the test method of the invention adopted, nanoscale devices can be selected for space projects, reference data can be provided for the application of reinforcement design, and reference data can be also provided for the research and development of anti-radiation reinforcement nanoscale devices.

The invention belongs to the technical field of physical experiment radiation detection, and particularly relates to a high-flux anti-electromagnetic interference proton energy spectrum and intensitydetector. The detector comprises a scintillator, an optical fiber coupling cone, a transmission optical fiber, an optical fiber splitter, a gated photomultiplier, a digitizer and a data storage system. The physical process is as follows: high-flux ions bombard a scintillator to generate scintillation light, and the scintillation light is coupled to an optical fiber through the optical fiber coupling cone; afterwards, the scintillation light is transmitted to a far end through the optical fiber and is coupled to the gated photomultiplier; under the control of a gate signal, the gate-controlledphotomultiplier can avoid a high-intensity electromagnetic pulse at a zero moment and convert an optical signal into an electric pulse signal; and the digitizer converts the electric pulse signal intodigits and inputs the digits into the computer for recording and storage. The detector can be used for measuring various high-flux ions in occasions where strong electromagnetic pulse possibly blindsa traditional detector system and in various complex electromagnetic environments, and has the characteristics of strong anti-electromagnetic interference performance, large proton receiving flux andthe like.

The invention provides a compact proton energy spectrum measuring device, which solves the problems of low efficiency and risk of contacting pollutants when a stack detector is adopted to detect a proton energy spectrum in the prior art. The device comprises a wedge-shaped filter disc, a scintillator, an imaging lens and a detector which are sequentially and coaxially arranged along the proton emitting direction, the thickness of the thin edge of the wedge-shaped filter disc is 0.2 mm-2 mm, and the thickness of the thick edge of the wedge-shaped filter disc is 1.0 mm-10 mm; the imaging lens adopts an object space telecentric system; proton beams enter the wedge-shaped filter disc and enter the scintillator after being filtered by the energy spectrum of the wedge-shaped filter disc, visiblephotons are excited and enter the imaging lens, and the imaging lens images a spatial distribution image of the visible photons to an image enhancement target surface of the detector. The energies ofthe protons penetrating through different thickness positions of the wedge-shaped filter disc are different, so that the continuous energy spectrum information of the protons can be obtained throughthe wedge-shaped filter disc, and the efficient measurement of the proton energy spectrum is achieved.

The invention discloses a method for acquiring a low-LET-value heavy ion single event upset cross section. The method comprises the following steps: acquiring device packaging information, information of a multilayer metal wiring layer or a substrate above a sensitive region, and thickness information of a device STI isolation oxide layer; carrying out an irradiation experiment of single event upset caused by direct ionization of low-energy protons of a nano device, extracting a single event upset peak cross section sigma peak of the low-energy protons of the device, and recording the thickness of a corresponding energy reduction sheet; obtaining a critical charge of the device generating single event upset, and calculating an LET threshold value of the device generating single event upset; based on the LET threshold value, judging a proton energy interval which causes the device to generate single event upset, calculating the percentage epsilon of the number of protons in the energy interval in a sensitive region of the device at the low-energy proton single event upset peak value position in the total number of incident protons, and calculating corresponding average proton energy and an average LET value; and dividing the single event upset peak cross section of the low-energy proton by the percentage epsilon of the number of protons, and calculating an effective single event upset cross section corresponding to the average LET value.

The invention provides a portable neutron and gamma ray dose measuring device, which comprises a detector, a counter and a data processing module, wherein the detector is a semiconductor detector containing a Cd-113 material and is used for detecting and recording gamma rays released by a capture reaction between thermal neutrons and the Cd-113 material and generating a thermal neutron prompt signal; the counter is a gas proportional counter tube containing a hydrogen-rich material and is used for detecting and recording proton energy released by a nuclear recoil reaction between the hydrogen-rich material and the fast neutrons and generating a fast neutron prompt signal; and the detector and the counter are respectively connected with the data processing module so as to send the thermal neutron prompt signal and the fast neutron prompt signal to the data processing module. According to the portable neutron and gamma ray dose measuring device, the neutron and gamma ray dose is measured through the combination of the tellurium-zinc-cadmium detector and the hydrogen-containing proportional counter tube, the overall size of the measuring device can be reduced, and meanwhile high measuring precision is achieved.

The invention discloses a proton energy parent rock amorphous nanometer composite material. The material is prepared from oxides, namely more than or equal to 26 weight percent and less than or equal to 33 weight percent of calcium oxide and more than or equal to 16 weight percent and less than or equal to 21 weight percent of manganese oxide, and more than or equal to 0.1 weight percent and less than or equal to 0.3 weight percent of trace elements, namely barium, zirconium, germanium, beryllium, magnesium, potassium, scandium, vanadium, chromium, cobalt, nickel, gallium, niobium, molybdenum, technetium, palladium, silver, indium, tin, antimony, hafnium, tantalum, tungsten, platinum, manganese, iron, aluminum, sodium, titanium, silicon and copper. The material can be nano-scale, warming articles can be prepared by adding the material into clothes and quilts in the process of producing the clothes and the quilts, and the material has good effects of improving sleeping, promoting blood circulation and the like.

The invention discloses a sector magnet energy selection optimization and proton medical power spectrum regulation and control device and method. The device comprises a laser, a target, a first focusing magnet, a sector magnet, a porous matched blocking piece, and a second focusing magnet. The device employs the porous matched blocking piece, and the porous matched blocking piece is a curved surface, wherein the curved surface is parallel to y axis, and the projection of the curved surface in the xz plane is coincided with a curve formed by the image points of proton beams with different energy in the xz plane; The device carries out the selection of the proton beams when the proton beams with different energy are focused at a minimum position, and the proton beams with the same energy and different divergent angles at the image point are converged to a very small size on the x axis, so the proton beams can be selected precisely. The device controls the transmission rate, improves the proton energy spatial resolution capability of the sector magnet, and can meet the requirements of dosage distribution of tumor treatment.

The invention discloses a method for using proton irradiation to prepare an ultrafast response GaN photoconductive switch. The method uses proton beams as irradiation sources, and adopts two proton beams of different energy and fluence to radiate a GaN photoconductive switch device successively, thereby obtaining an ultrafast response characteristic. The prepared GaN photoconductive switch includes a sapphire substrate and a GaN layer, the GaN layer includes a AlN nucleating layer, a GaN high-temperature buffer layer, an i-GaN layer and an n-GaN layer, and a Ni/Cr/Au metal electrode is led out from the n-GaN layer. The proton irradiation conditions adopted by the invention are that the proton fluence is 1*10<11>~9*10<18>/cm2, and proton energy is 0.5~10 MeV. By use of the method, a response characteristic of a photoelectric conduction device can be obviously improved, an ultrafast response GaN photoconductive switch device can be prepared, and the method can be applied to the fields of ultrafast photoelectronics, large-power electromagnetic pulse generation and the like, and has great scientific value and broad application prospects.