38 results about "Spallation Neutron Source" patented technology

The invention discloses a liquid metal cooling reactor experimental system capable of realizing critical and subcritical running test. The liquid metal cooling reactor experimental system consists of a safety vessel (1), a main vessel (2), a reactor inner supporting structure (3), a reactor core (4), a central measuring column (5), a main heat exchanger (6), a reloading mechanism (7), a reactor top cover (8), a control bar drive mechanism (9) and a neutron source (10); when the critical running test is performed, the neutron source (10) adopts a californium-252 neutron source or a Be-Am neutron source; when the subcritical running test is performed, the neutron source (10) adopts a spallation neutron source or a deuterium tritium neutron source, an isotopic neutron source and a fuel component in the middle part of the reactor core are replaced by an accelerator neutron source according to the real requirement of the spallation neutron source, and the reactor can have the subcritical running test. The reactor experimental system is naturally and circularly cooled by adopting liquid lead-bismuth or lead, so that the usability of the reactor can be improved, the experimental cost can be reduced, and the multifunctional reactor experimental system characteristics can be achieved.

The invention relates to the technical field related to a spallation neutron source, in particular to a rotating disc type neutron chopper. The rotating disc type neutron chopper comprises a vacuum sealed cavity and a rotating disc. The rotating disc is arranged in the vacuum sealed cavity and is driven by a servo motor to rotate. The rotating disc is provided with a sector opening. Neutron beam windows are correspondingly arranged on the front side and the back side of the vacuum sealed cavity and are channels through which neutron beams pass the vacuum sealed cavity. The servo motor directly drives the rotating disc with the sector opening to cut the neutron beams to guarantee that the neutron beams conforming to the appointed wavelength range can pass the rotating disc type neutron chopper, and therefore the neutron beams with the appointed wave band can be accurately cut out. In addition, the rotating disc type neutron chopper is provided with the vacuum sealed cavity, the rotating disc type neutron chopper can run under the vacuum condition, and therefore scattering of the neutron beams in air when the neutron beams pass the rotating disc type neutron chopper can be reduced.

The invention provides a spallation neutron source target which comprises a target container of a single-layer structure, wherein the target container is provided with a target piece installation cavity, a target window is arranged at the front end of the target container, a cooling liquid inlet and a cooling liquid outlet are formed in the rear end of the target container, a plurality of target pieces are arranged in the target piece installation cavity side by side from the front side to the back side, and cooling liquid flowing gaps are formed between every two adjacent target pieces. The spallation neutron source target is of the single-layer structure, a cooling circuit is formed in the target piece installation cavity by means of the cooling liquid inlet and the cooling liquid outlet, the structure is simple, and machining is easy to achieve.

The invention provides a method for measuring the 1MeV equivalent neutron flux of a spalling neutron source on the basis of a grid control technology. The method solves the technical problem that existing means for measuring the low-pass 1MeV equivalent neutron flux of spalling neutron sources are limited. According to the method, by utilizing the characteristic of the linear relation between minority carrier lifetime reciprocals of bipolar transistors and the 1MeV equivalent neutron flux, the 1MeV equivalent neutron flux of the spalling neutron source is calculated on the basis of a minoritycarrier lifetime damage constant of 1MeV equivalent neutrons of a reactor on transverse transistors. The method can keep high measurement accuracy in a wide neutron flux range.

The invention provides a solid target slice for a spallation neutron source and a preparing method of the solid target slice to enhance the connecting strength of tantalum and tungsten in the target slice and prolong the service life of the target slice. The preparing method of the solid target slice for the spallation neutron source comprises the steps that a tungsten block and a tantalum plate which are to be welded are washed; the tantalum plate is tightly attached to the six faces of the tungsten block so that a tantalum box containing the tungsten block can be formed; the tantalum box is sealed and welded; the tantalum box which is sealed and welded is placed into a hot isostatic pressing furnace to be pressured in a hot isostatic mode and then is taken out, and then the target slice is obtained. According to the preparing method of the solid target piece for the spallation neutron source, other transition metal is not introduced, the tantalum plate and the tungsten block are directly connected in a diffusion mode on a large area, metallurgical bonding can be achieved between the tantalum and the tungsten in the manufactured target slice, the bonding strength is high, a tantalum coating is compact, the erosion corrosion resisting performance of the target slice is enhanced, and the service life of the target slice is prolonged.

The invention discloses a method for welding tantalum layers to six faces of a tungsten block in a diffusion manner. The method comprises the steps that an outer wrapping sleeve is made of at least one of titanium, iron and molybdenum and is provided with a cavity for containing the tungsten block, spacer sheets and tantalum sheets are sequentially laid on the inner wall of the cavity, and then the tungsten block is placed in the cavity; tantalum sheets and spacer sheets are sequentially laid on the surface of the part, on the end face of the outer wrapping sleeve, of the tungsten block, metal sheets are used for covering, and electron beam welding is carried out on the metal sheets and the outer wrapping sleeve under the vacuum condition; then hot isostatic pressure diffusion welding is carried out; and the outer wrapping sleeve is removed after welding is finished. According to the method, the tantalum sheets and the tungsten block are located through the outer wrapping sleeve, the step of manufacturing a tantalum box through electron beam welding is omitted, no air suction material is needed for wrapping, the technology is simple, and cost is low. Due to the spacer sheets, after diffusion welding is finished, products can be taken out very conveniently, simpleness and easy operation are achieved, the requirement for efficiently producing tantalum-tungsten composite materials in a batch manner can be met, and a basis is laid for research and wide application of spallation neutron sources.

The invention discloses an apparatus for testing an electronic peeling membrane, and an application thereof. The apparatus for testing the electronic peeling membrane comprises a cavity, a vacuum-pumping device, an electronic peeling membrane clamping assembly, an electronic gun, a first Faraday cup and a second Faraday cup, wherein the cavity is provided with a top cover which can be open and closed, and a sealed cavity is formed when the top cover is closed; the vacuum-pumping device employs cavity vacuum-pumping; the electronic peeling membrane clamping assembly is installed in the cavity; the electronic gun is installed at the inner side wall of the cavity and is used for bombarding an electronic peeling membrane to be tested; the first Faraday cup is fixed at a beam outlet of the electronic gun; and the second Faraday cup is arranged at the inner side wall of the cavity opposite to the electronic gun. The apparatus provided by the invention can simulate a vacuum and beam injection environment where the electronic peeling membrane works; the apparatus employs an electron beam, reduces the cost, reduces the radiation quantity and improves the equipment safety; and membrane performance can be more accurately grasped, and the apparatus has great significance on selection and design of an electronic peeling membrane of a spallation neutron source, reduces the development cost of the peeling membrane and improves the development efficiency.

The invention discloses a particle beam image coating used for a spallation neutron source and a preparation method of the particle beam image coating. The particle beam image coating is coated on the outer surface of a front window of a bombarded target, and the main active ingredient of the particle beam image coating is Cr3+doped Al2O3 powder. The preparation method includes coating the Cr3+doped Al2O3 powder on the outer surface of the front window of the target by means of low-power flame spraying to form the image coating. The image coating is developed specially for the spallation neutron source which is a second spallation neutron source using the image coating in the world after an American spallation neutron source is developed. The particle beam image coating is high in light emitting efficiency, using needs on accurately judging beam current distribution and strength at a target position during particle beam bombarding of high-energy proton beam current or ion beam current can be met, and a foundation is laid for further study and development of the spallation neutron source in China.

The invention relates to the spallation neutron source technology field and especially relates to a reflector used for a spallation neutron source. A whole body of the reflector is in a step cylinder shape. The reflector mainly comprises a lower segment of the reflector, a connecting ring, a middle segment of the reflector and an upper segment of the reflector which are connected through a long bolt. The connecting ring is used for connecting the lower segment of the reflector and a lower portion of the middle segment of the reflector. Aiming at an actual condition of spallation neutron source apparatus construction of our country, the invention provides the reflector which is customized for the spallation neutron source apparatus of our country. The reflector is suitable for a neutron source in a present situation of our country. A component structure adopted by the reflector satisfies each physical demand in the spallation neutron source. Components can be processed and manufactured, and installation and positioning are accurate. During an operation process, an internal temperature in the lower segment of the reflector can be monitored in real time so that an influence of a local high temperature on a material is prevented. In the invention, a service life is long, and remote control maintenance can be performed; after a service period is ended, through remote control operation, remote dismounting and hoisting are realized; and remote maintenance operation of a whole plug-in is realized too.

The invention discloses a particle beam image coating used for a spallation neutron source and a preparation method of the particle beam image coating. The particle beam image coating is coated on the outer surface of a front window of a bombarded target, and the main active ingredient of the particle beam image coating is Cr3+doped Al2O3 powder. The preparation method includes coating the Cr3+doped Al2O3 powder on the outer surface of the front window of the target by means of low-power flame spraying to form the image coating. The image coating is developed specially for the spallation neutron source which is a second spallation neutron source using the image coating in the world after an American spallation neutron source is developed. The particle beam image coating is high in light emitting efficiency, using needs on accurately judging beam current distribution and strength at a target position during particle beam bombarding of high-energy proton beam current or ion beam current can be met, and a foundation is laid for further study and development of the spallation neutron source in China.

The invention discloses a preparation method of a Fresnel lens group for focusing of a neutron small-angle scattering spectrometer. According to the preparation method of the Fresnel lens group, underthe condition of minimum Q layout of a neutron small-angle scattering spectrometer, the focal length of a Fresnel focusing lens is determined, the number of lenses and the wavelength of incident neutrons are selected to determine the focal length of a single Fresnel lens, the curvature radius of a spherical or parabola-shaped concave lens is determined with the center of a wafer as the vertex ofthe concave lens, and then sawtooth-shaped vertex angles are manufactured on the periphery of the concave lens. The method is combined with a neutron small-angle scattering spectrometer based on a reactor and a spallation neutron source, and the neutron flux of the sample position can be enhanced under the minimum Q layout of the neutron small-angle scattering spectrometer.

The invention discloses a device using a neutron small-angle diffraction spectrometer to quickly locating sample location. The device is characterized in that a beam-limiting diaphragm which is fixedly arranged in a collimator cavity is connected with a stepping motor; a brake part in the collimator cavity is rigidly connected with a high-precision laser level; a pneumatic unit is fixedly connected with a rail, a control computer and an air compressor; the brake part is rigidly connected with the rail; the high-precision laser level is connected with an operation handle, and is rigidly connected with the brake part; a source diaphragm is arranged at the front end of the exterior of the collimator cavity; a collimation telescopic pipe is fixedly connected with the collimator cavity; a sample diaphragm is arranged on the collimation telescopic pipe; the brake part can do three-dimensional movement; in the debugging process, the high-precision laser level is used for pushing the position of a neutron beam flow, a horizontal and vertical rotation mechanism of the brake part is adjusted, and the emitted laser beams can simultaneously penetrate through the beam-limiting diaphragm. The device has the advantages that the device is jointly used together with the neutron small-angle diffraction spectrometer based on a reactor and a spallation neutron source, and the sample in different in-situ environment equipment can be quickly positioned.

The invention provides a spallation neutron source target, which comprises a single-layer structure target container, the target container has a target plate installation cavity, the front end of the target container is provided with a target window, and the rear end is provided with a cooling liquid inlet and a cooling liquid outlet, and a plurality of target pieces are arranged side by side in the target piece installation cavity from front to back, and there is a coolant flow gap between every two adjacent target pieces. The spallation neutron source target provided by the present invention has a single-layer structure, and a cooling circuit is formed in the target mounting cavity through a cooling liquid inlet and a cooling liquid outlet, and has a simple structure and is easy to process.

The invention discloses bendable and foldable organic silicon rubber with high neutron shielding effectiveness and a preparation method thereof. According to the method, 110 silicone rubber is used as base rubber, fumed silica, nuclear power grade B4C powder or a foaming agent is added, and hot-pressing vulcanization molding is performed under the action of a vulcanizing agent. According to different components of the material, the neutron shielding rate of the boron silicon rubber can reach 99.9% or above for fast neutrons, medium energy neutrons or slow neutrons. The organic silicon rubber can be widely applied to spallation neutron source, nuclear facility pipeline neutron protection and neutron radiation field personnel protection; meanwhile, the material is simple in preparation process and can be subjected to continuous extrusion molding.

The invention discloses a connection sealing device for a spallation neutron source target container and a target vehicle. The connection sealing device comprises a W-shaped elastic ring, a slot is respectively formed on an outer periphery on each of two ends of the elastic ring, and a flexible graphite ring is arranged in the slot. By the adoption of the connection sealing device for the spallation neutron source target container and the target vehicle, the sealing performance is promoted, and hidden safety risks are eliminated.

The invention discloses a liquid metal cooling reactor experimental system capable of realizing critical and subcritical running test. The liquid metal cooling reactor experimental system consists of a safety vessel (1), a main vessel (2), a reactor inner supporting structure (3), a reactor core (4), a central measuring column (5), a main heat exchanger (6), a reloading mechanism (7), a reactor top cover (8), a control bar drive mechanism (9) and a neutron source (10); when the critical running test is performed, the neutron source (10) adopts a californium-252 neutron source or a Be-Am neutron source; when the subcritical running test is performed, the neutron source (10) adopts a spallation neutron source or a deuterium tritium neutron source, an isotopic neutron source and a fuel component in the middle part of the reactor core are replaced by an accelerator neutron source according to the real requirement of the spallation neutron source, and the reactor can have the subcritical running test. The reactor experimental system is naturally and circularly cooled by adopting liquid lead-bismuth or lead, so that the usability of the reactor can be improved, the experimental cost can be reduced, and the multifunctional reactor experimental system characteristics can be achieved.

The invention discloses an experiment device and test method for testing electrical performance of a multi-contact electrical connection structure, and relates to the technical field of spallation neutron source. The experiment device includes a lower base, a fixed base, and a movable base, the movable base can perform elevating motion, a thermocouple upper component is embedded into the bottom surface of the movable base, a thermocouple lower component is embedded into the upper surface of the lower base, when the movable base performs the elevating motion, and the distance between the thermocouple upper component and the thermocouple lower component is changed. The test method includes the following steps: (1): assembling thermocouple; (2): assembling the movable base; (3): assembling the lower base and the fixed base; (4): adjusting the distance , and the like. An assembling mode between a target plug-in and a target plug-in support in the spallation neutron source can be simulated,and the electrical connection performance of the multi-contact electrical connection structure of the thermocouple can be predicted and verified in the possible assembling error range.

The invention discloses a method for welding tantalum layers to six faces of a tungsten block in a diffusion manner. The method comprises the steps that an outer wrapping sleeve is made of at least one of titanium, iron and molybdenum and is provided with a cavity for containing the tungsten block, spacer sheets and tantalum sheets are sequentially laid on the inner wall of the cavity, and then the tungsten block is placed in the cavity; tantalum sheets and spacer sheets are sequentially laid on the surface of the part, on the end face of the outer wrapping sleeve, of the tungsten block, metal sheets are used for covering, and electron beam welding is carried out on the metal sheets and the outer wrapping sleeve under the vacuum condition; then hot isostatic pressure diffusion welding is carried out; and the outer wrapping sleeve is removed after welding is finished. According to the method, the tantalum sheets and the tungsten block are located through the outer wrapping sleeve, the step of manufacturing a tantalum box through electron beam welding is omitted, no air suction material is needed for wrapping, the technology is simple, and cost is low. Due to the spacer sheets, after diffusion welding is finished, products can be taken out very conveniently, simpleness and easy operation are achieved, the requirement for efficiently producing tantalum-tungsten composite materials in a batch manner can be met, and a basis is laid for research and wide application of spallation neutron sources.

The invention discloses a square hole particle beam collimator with continuously adjustable aperture and an aperture adjusting method thereof, in the collimator, a rotating disc is arranged in a collimator main body, a disc through hole and a plurality of arc-shaped guide grooves are formed in the rotating disc, a pair of first collimation blocks and a pair of second collimation blocks are respectively arranged on two sides of the rotating disc, and the first collimation blocks and the second collimation blocks are arranged on the two sides of the rotating disc. Each collimation block is also provided with a contact sleeve, and each contact sleeve slides along the arc-shaped guide groove when the rotating disc rotates. A linkage assembly connected with the power output tail end of the aperture adjusting driving mechanism is further arranged on the outer side of the rotating disc. According to the aperture adjusting method, when the rotating disc rotates, the arc-shaped guide grooves drive the contact sleeve to move so as to drive the first collimation block and the second collimation block to conduct opening and closing actions, and when the channel distance between the first collimation block and the second collimation block changes, the aperture of the square hole changes along with the change of the channel distance between the first collimation block and the second collimation block. The collimator is compact in structure and convenient to use, and can be well applied to Chinese spallation neutron source associated proton beams.

The invention discloses a connection sealing device for a spallation neutron source target container and a target vehicle. The connection sealing device comprises a W-shaped elastic ring, a slot is respectively formed on an outer periphery on each of two ends of the elastic ring, and a flexible graphite ring is arranged in the slot. By the adoption of the connection sealing device for the spallation neutron source target container and the target vehicle, the sealing performance is promoted, and hidden safety risks are eliminated.

The invention discloses an apparatus for testing an electronic peeling membrane, and an application thereof. The apparatus for testing the electronic peeling membrane comprises a cavity, a vacuum-pumping device, an electronic peeling membrane clamping assembly, an electronic gun, a first Faraday cup and a second Faraday cup, wherein the cavity is provided with a top cover which can be open and closed, and a sealed cavity is formed when the top cover is closed; the vacuum-pumping device employs cavity vacuum-pumping; the electronic peeling membrane clamping assembly is installed in the cavity; the electronic gun is installed at the inner side wall of the cavity and is used for bombarding an electronic peeling membrane to be tested; the first Faraday cup is fixed at a beam outlet of the electronic gun; and the second Faraday cup is arranged at the inner side wall of the cavity opposite to the electronic gun. The apparatus provided by the invention can simulate a vacuum and beam injection environment where the electronic peeling membrane works; the apparatus employs an electron beam, reduces the cost, reduces the radiation quantity and improves the equipment safety; and membrane performance can be more accurately grasped, and the apparatus has great significance on selection and design of an electronic peeling membrane of a spallation neutron source, reduces the development cost of the peeling membrane and improves the development efficiency.

The invention relates to a propulsion device for a spallation neutron source target vehicle. The propulsion device comprises a heavy guide rail, a target vehicle base, a whole vehicle propulsion device, a propulsion block, a locking rod and a secondary propulsion device, wherein the target vehicle base is slidably mounted on the heavy guide rail; the heavy guide rail is mounted on a base; the target vehicle base is connected with the whole vehicle propulsion device; the propulsion block and the target vehicle are mounted on the target vehicle base; the locking rod is fixedly mounted on the propulsion block; the locking rod is matched with a locking hole in the base; the secondary propulsion device comprises a light guide rail, a servo motor, a gearbox body and a transmission screw; the light guide rail is slidably mounted on the target vehicle base; the servo motor and the gearbox body are mounted on the light guide rail; an output shaft of the servo motor is connected with the gearbox body; an output shaft of the gearbox body is connected with the transmission screw; a nut base is arranged on the propulsion block; the transmission screw is connected with the nut base; and an axis of the transmission screw is parallel to a propulsion direction of the target vehicle. The propulsion device for the spallation neutron source target vehicle can effectively ensure sealing property and is excellent in reliability.

The invention provides a method for measuring the 1MeV equivalent neutron flux of a spalling neutron source on the basis of a grid control technology. The method solves the technical problem that existing means for measuring the low-pass 1MeV equivalent neutron flux of spalling neutron sources are limited. According to the method, by utilizing the characteristic of the linear relation between minority carrier lifetime reciprocals of bipolar transistors and the 1MeV equivalent neutron flux, the 1MeV equivalent neutron flux of the spalling neutron source is calculated on the basis of a minoritycarrier lifetime damage constant of 1MeV equivalent neutrons of a reactor on transverse transistors. The method can keep high measurement accuracy in a wide neutron flux range.

The invention relates to a propulsion device for a spallation neutron source target vehicle. The propulsion device comprises a heavy guide rail, a target vehicle base, a whole vehicle propulsion device, a propulsion block, a locking rod and a secondary propulsion device, wherein the target vehicle base is slidably mounted on the heavy guide rail; the heavy guide rail is mounted on a base; the target vehicle base is connected with the whole vehicle propulsion device; the propulsion block and the target vehicle are mounted on the target vehicle base; the locking rod is fixedly mounted on the propulsion block; the locking rod is matched with a locking hole in the base; the secondary propulsion device comprises a light guide rail, a servo motor, a gearbox body and a transmission screw; the light guide rail is slidably mounted on the target vehicle base; the servo motor and the gearbox body are mounted on the light guide rail; an output shaft of the servo motor is connected with the gearbox body; an output shaft of the gearbox body is connected with the transmission screw; a nut base is arranged on the propulsion block; the transmission screw is connected with the nut base; and an axis of the transmission screw is parallel to a propulsion direction of the target vehicle. The propulsion device for the spallation neutron source target vehicle can effectively ensure sealing property and is excellent in reliability.

The invention relates to the field of spallation neutron source emission, and more particularly to a mobile type shielding iron box which is formed by piling up twelve models of twenty-three iron lumps in total, the iron lumps are: one No. one iron lump, one No. two iron lump, one No. three iron lump, one No. seven iron lump, two No. four iron lumps, two No. five iron lumps, two No. six iron lumps, two No. nine iron lumps, two No. eleven iron lumps, two No. twelve iron lumps, three No. eight iron lumps, and four No. ten iron lumps. The mobile type shielding iron box adopts a reasonable piling up manner, and can carry out better shielding to multiple kinds of ray radiation entering the interior of a box.

The invention discloses a preparation method of a diamond neutron detector for eliminating a polarization effect. The preparation method comprises the following steps: carrying out chemical cleaning and plasma surface treatment on a diamond body material; growing a silicon nitride passivation layer on the front surface of the diamond body material; preparing ohmic contact electrodes and polarization electrodes on the front surface and the back surface of the diamond respectively through high-vacuum equipment, wherein the back polarization electrodes must be located at the dead center position of the back of the diamond; arranging a silicon nitride passivation isolation layer between the ohmic contact electrodes and the polarization electrodes on the front surface of the diamond; connecting the polarized electrodes to two ends of a direct-current small-voltage power supply; and connecting the ohmic contact electrode to two ends of a high-voltage power supply. The preparation method of the diamond neutron detector for eliminating the polarization effect has the advantages of high charge collection efficiency, neutron detection efficiency, counting rate and the like, and has important application value in fast neutron detection in occasions of high-energy particle detection, spallation neutron sources, nuclear reactors and the like.

The invention provides a solid target piece for a spallation neutron source and a preparation method thereof, which are used to enhance the connection strength between tantalum and tungsten in the target piece and improve the service life of the target piece. Among them, a method for preparing a solid target for a spallation neutron source, comprising: cleaning the tungsten block and the tantalum plate to be welded; attaching the tantalum plate to the six faces of the tungsten block to form a tungsten block A tantalum box; sealing and welding the tantalum box; putting the sealed and welded tantalum box into a hot isostatic pressing furnace for hot isostatic pressing and taking it out to obtain a target piece. The preparation method of the solid target for the spallation neutron source provided by the present invention does not introduce other transition metals, and directly diffuses and connects the tantalum plate and the tungsten block in a large area, so that the tantalum and tungsten in the prepared target can achieve metallurgical bonding and the bonding strength High, dense tantalum coating, which enhances the anti-erosion corrosion performance of the target and improves the life of the target.

The invention discloses a method and a system for measuring a high-energy proton beam spot in front of a target, and the method comprises the steps: arranging a pinhole device which can be used for pinhole imaging between a gamma ray detector and a target station, and transmitting an image of a secondary gamma ray of a target surface in a dihedral direction of the target station to a pixel type gamma ray detector by combining a pinhole imaging principle, so that the beam spot distribution information of the incident protons on the target surface can be obtained through the detected distribution information of the secondary gamma rays on the target surface, and a distribution image of the beam spots of the incident protons can be obtained in real time. Due to the fact that the method and the system for measuring the pre-target high-energy proton beam spot can avoid a strong-radiation target area, the system is suitable for measuring the pre-target high-energy proton beam spot of a high-power spallation neutron source, an accelerator driving subcritical system and other large devices, and the higher the power of the incident proton beam for targeting is, the better the measuring effect is.