38 results about "Spallation Neutron Source" patented technology

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 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 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 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 pre-cut beam splitter used for beam pulse control. The pre-cut beam splitter comprises an electrostatic deflection plate installed at a magnetic-focusing and matched-structure low-power transmission line tail end, a power supply providing a voltage for the electrostatic deflection plate and an attached device which matches with and is used with the electrostatic deflection plate. The attached device is installed on the low-power transmission line tail end and is located in front of the electrostatic deflection plate. The electrostatic deflection plate is formed by two flat electrode plates. The two electrode plates are symmetrically installed in a mirror image mode. A width and an installation distance of the two electrode plates present positive correlation linearity changes along with a diameter of a beam envelop. By using the pre-cut beam splitter, the electrode plates which change along with the beam envelop are taken as the electrostatic deflection plate; an electrostatic cutting beam is firstly used in the Chinese spallation neutron-source magnetic-focusing and matching-structure low-power transmission line; cutting beam rise / falling edge time is less than 15ns; and a new device and a new method are provided for a pre-cut beam of a spallation neutron source.

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 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 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.