1428results about "Superconductor elements usage" patented technology

The invention discloses a method for improving deformation uniformity of a core wire of an NbTi superconducting wire, and belongs to the technical field of superconducting wire processing. The method comprises the following steps: performing deep hole drilling on an oxygen-free copper ingot rod, then assembling, welding and extruding the oxygen-free copper ingot rod and a single-core rod to obtain a composite rod, and performing multi-pass drawing on the composite rod to obtain the NbTi superconducting wire with high performance, low loss and high N value. The Jc of the prepared NbTi superconducting wire is 2880-3120 A / mm < 2 >, the loss is 450-550 mJ / cm < 3 >, the N value is 70-95, compared with a superconducting wire prepared through a conventional process, the N value is remarkably increased, the loss is remarkably reduced, the critical current density is increased, and the NbTi superconducting wire has wide application prospects in MRI magnets.

The invention relates to a 1400 MPa-grade nickel-based alloy for a second-generation high-temperature superconducting base band and a preparation method of the 1400 MPa-grade nickel-based alloy, and belongs to the technical field of materials. The nickel-based alloy comprises the following chemical components in percentage by weight: 15.0 to 17.0 percent of Cr, 13.0 to 15.0 percent of Mo, 5.5 to 9.0 percent of W, 5.0 to 7.0 percent of Fe, 0.4 to 0.6 percent of Mn, 0.01 to 0.05 percent of Si, 0.1 to 0.2 percent of V, 0.0 to 2.5 percent of Co, 0.1 to 0.2 percent of Al, 0.001 to 0.01 percent of B and Clt, 0.005%, Plt; 0.005%, Slt; 0.002%, Olt; 0.002%, Nlt; 0.002%, and the balance being nickel. On the basis of the Ni-Cr-Mo alloy, the composition design thought of increasing W and reducing Mo is adopted, the optimized hot working and heat treatment process is matched, and finally the strength of a base body is improved through cold deformation; the content of C is controlled, precipitation of carbides is controlled, and alloy elements are ensured to be completely dissolved into a matrix during homogenization treatment; and a pure smelting process is adopted, so that the oxygen content in the alloy is reduced, the inclusion content is controlled, and high purity is ensured.

The invention discloses a superconducting magnet quench detection early warning system and method based on skeleton current, and relates to the field of superconducting magnet quench detection, and the method comprises the steps: constructing an electrothermal coupling finite element model of a superconducting magnet and a conductive skeleton; simulating different quench events based on the electrothermal coupling finite element model; according to different quench events, quench judgment threshold values and different levels of quench severity index grading threshold values are determined; when the superconducting magnet is out of service, acquiring a skeleton current signal that the current of the superconducting magnet is shunted to the conductive skeleton; based on the skeleton current signal, according to the quench judgment threshold value and the quench severity index grading threshold value, grading early warning and protection response are conducted on the superconducting magnet quench, nondestructive testing can be conducted on the superconducting magnet quench, grading evaluation and optimization protection of the quench severity degree are achieved, and the safety of the superconducting magnet quench is improved. And the cost of the quench monitoring system is reduced.

The invention relates to a high-temperature superconducting cable and a manufacturing process thereof, and belongs to the technical field of electric wires and cables.The cable comprises a supporting framework, a buffer layer, a three-phase superconducting composite layer, a shielding layer, a heat insulation layer and a sheath layer which are sequentially arranged from inside to outside; the heat insulation layer comprises at least two layers of corrugated pipes formed by continuous rolling and welding, and the corrugated pipes are of periodic concave-convex structures obtained by conducting continuous rolling and side seam welding on metal strips to form closed pipe bodies and then conducting embossing treatment on the closed pipe bodies. A woven reinforcing layer wrapping the peripheries of the corrugated pipes is further arranged in the heat insulation layer, and the adjacent corrugated pipes are connected through supporting pieces to form a vacuum interlayer. According to the application, the corrugated pipe formed by continuous coiling and welding is combined with the combined structure of the braided reinforcing layer and the supporting piece, so that the continuous production of the large-length high-temperature superconducting cable can be conveniently realized, and the problems of axial stress concentration and seam accumulation defects existing in a heat insulating layer of a traditional prefabricated sleeve pipe can be eliminated; and the air tightness stability of the vacuum interlayer of the large-length high-temperature superconducting cable is ensured.

The invention belongs to the technical field of superconducting wires, and relates to a niobium-tin composite superconducting wire and a preparation method thereof. The invention provides a Nb3Sn composite superconducting wire. The Nb3Sn composite superconducting wire sequentially comprises an Nb3Sn superconducting wire core, a barrier layer, a stable layer, a transition layer, a substrate layer and a functional layer from inside to outside, the transition layer is formed by mixing copper and a dielectric polymer, and the copper content is continuously decreased in a gradient manner from inside to outside; the substrate layer is the dielectric polymer; the functional layer is a plurality of protruding metal microstructures. According to the invention, the functional layer with the broadband electromagnetic stealth function is integrated on the basis of the Nb3Sn superconducting wire rod, so that the radar cross section is obviously reduced while the Nb3Sn superconducting wire rod bears high-density superconducting current and generates a strong magnetic field, and the technical problem that a high-field superconducting magnet system is easy to detect in an electromagnetic environment is solved.

The invention discloses a superconducting coil shape preserving tool, which relates to the technical field of superconducting coils and is used for preserving the shape of a coil in a heat treatment process of the superconducting coil, and the coil is wound in a ring shape and is provided with a radial inner side surface, a radial outer side surface and two axial end surfaces. The superconducting coil shape-preserving tool comprises a support and a plurality of fixing structures, wherein the support forms an annular shape; the multiple fixing structures are connected with the support and arranged at intervals in the circumferential direction of the support, each fixing structure comprises multiple pressing plates, and the multiple pressing plates comprise the first pressing plate, the second pressing plate and the third pressing plate; the first pressing plate is used for limiting the radial inner side face of the coil, the second pressing plate is far away from the center of the support relative to the first pressing plate and used for limiting the radial outer side face of the coil, and the third pressing plate is arranged between the first pressing plate and the second pressing plate and used for limiting the two axial end faces of the coil. The superconducting coil shape preserving tool can be used for preserving the shape of the coil so as to reduce the deformation of the coil in the heat treatment process.

The invention belongs to the technical field of cable processing, and relates to a preparation method and application of a flexible superconducting coaxial cable outer conductor. The preparation method comprises the following steps: mixing Nb powder and Ti powder by adopting a vibrating ball mill to prepare NbTi composite powder; a substrate of laser powder bed melting equipment is preheated, the NbTi composite powder is spread on the substrate of the laser powder bed melting equipment, a melting powder layer is scanned through the laser powder bed melting technology, a three-dimensional communicated grid structure is formed through interlayer staggered scanning, finally, the NbTi net-shaped alloy pipe is placed in a strong acid solution to be soaked for a short time, redundant metal powder is removed, and the NbTi net-shaped alloy pipe is obtained. And finally, the preparation of the flexible superconducting coaxial cable outer conductor for the quantum computer is realized.

The invention relates to the technical field of electric wires and cables, and discloses an ultrahigh-conductivity electric wire and cable and a preparation method thereof. A graphene enhancement layer; a nano composite insulating material layer; an inner semi-conductive layer; a conductive copper strip shielding layer; a silver-plated copper wire woven mesh shielding layer; an intelligent monitoring and protection sheath; the method comprises the following steps: step S01, preparing a superconducting core wire strand; step S02, preparing a nano composite insulating material layer; s03, preparing a shielding layer; step S04, intelligent monitoring and protection sheath preparation; the superconducting core wire strand formed by twisting a plurality of YBCO superconducting material filaments forms a stable structure with excellent conductivity under the precise control of twisting process parameters, so that the resistance is effectively reduced, the loss in the electric energy transmission process is reduced, the electric energy transmission efficiency is improved, high-density current can be borne for stable transmission, and the service life of the cable is prolonged. And the requirement of the modern electrical engineering field on high conductivity of wires and cables is met.

The invention provides a method for preparing an iron-based superconducting material single crystal in a microgravity environment, and belongs to the field of superconducting materials. The method specifically comprises the following steps: carrying out a microgravity crystal growth experiment in a high-temperature experiment cabinet of a space station, putting a solid-phase sintered or pre-melted rod-like raw material into a furnace body, heating and melting, then slowly solidifying, and finally growing the iron-based superconducting material single crystal with large size and extremely low defect density.

To suppress reduction of an electrification performance (current value) in an end structure for a superconducting cable.SOLUTION: An end structure for a superconducting cable comprises at least a multilayer conductor 10 and an electrode part 30, and the multilayer conductor 10 is configured by laminating a plurality of superconducting wires 20, each presenting a tape shape, in a thickness direction of the superconducting wire 20. The electrode part 30 includes at least a plurality of slits 40. The multilayer conductor 10 is divided into a plurality of wire units 11, and stored in the slit 40 for each wire unit 11. When storing two superconducting wires 20 in the slit 40, it is preferable that directions of faces of the superconducting wires 20 are adjusted in such a manner that faces at the sides of a superconducting layer 23 and a stabilizing layer 24 constituting the superconducting wire 20 is brought into contact with or made close to an inner wall surface of the slit 40.SELECTED DRAWING: Figure 1

The invention discloses a superconducting magnet coil quenching detection method and a related device, and relates to the technical field of superconducting magnets, and the method comprises the steps: collecting the total voltage of two ends of a superconducting magnet coil and the current of any end of the superconducting magnet coil in real time in the operation process of a superconducting magnet; based on a relation curve that the inductance of the superconducting magnet coil changes along with the current, the resistive voltage in the superconducting magnet coil is determined through the total voltage at the two ends of the superconducting magnet coil and the current at any end of the superconducting magnet coil; when it is detected that the resistive voltage is increased to a voltage threshold value or the continuous increasing duration of the resistive voltage exceeds a duration threshold value, it is judged that the superconducting magnet coil is quenched; through the method, the problems that an existing superconducting magnet quenching detection method is complex and low in detection sensitivity are solved.

The invention discloses a copper plating method for a superconducting strip. The method comprises the following steps: S1, carrying out initial electrochemical copper plating on a processed strip; s2, high-precision continuous thickness measuring equipment is adopted to test the thickness of the plating layer in the length direction and the width direction of the strip; s3, compensating the thickness error by adjusting the position of the shielding plate according to the thickness distribution data obtained by testing; and S4, the steps S2-S3 are repeated until the plating layer is accumulated to reach the target thickness. The thicknesses of the copper plating layers on the two sides of the superconducting tape are adjusted by adjusting the shielding plates, non-contact detection and dynamic adjustment of the thickness of the plating layer are achieved, and the precision of the thickness of the plating layer is improved.

The invention discloses a preparation method of a multi-core Nb3Sn composite wire and the composite wire. The method comprises the following steps: loading an Nb rod into an oxygen-free copper pipe to obtain a CuNb single-core rod; the CuNb single-core rods and the hexagonal copper core rods are sequentially arranged in a CuMn alloy pipe at intervals to obtain a multi-core CuNb composite sheath, and then the multi-core CuNb composite sheath is machined into a CuNb composite rod; the CuNb composite rod is machined into a CuNb composite pipe; the SnTi alloy bar is loaded into the CuNb composite tube to obtain a sub-component; a hexagonal CuMn subcomponent is obtained through machining; the hexagonal CuMn subcomponent and the SnCu alloy bar are assembled into a Ta tube and then integrally assembled into an oxygen-free copper tube to obtain a composite wire, and the composite wire is processed to obtain the Nb3Sn superconducting wire. CuNb single core rods on the outermost layer are adjusted to be in discontinuous close arrangement, the problem that machining cracking is prone to occurring in the subcomponent preparation stage due to the fact that Cu on the outer portions of the single core rods is little is solved, the deformation consistency of the wire in the composite wire machining stage is further enhanced by using the CuMn alloy on the outer portions of the subcomponents, it is also guaranteed that the wire cannot crack when stretched, and the service life of the wire is prolonged. The fan-shaped SnCu alloy bars are additionally arranged, so that sufficient Sn is ensured when the wire Nb generates Nb3Sn.

The invention discloses a superconducting fault current limiter and net rack cooperative suppression method for short-circuit current of a receiving-end power grid. Comprising the following steps: firstly, quantifying and constructing a short-circuit current constraint model considering superconducting fault current limiter configuration and grid structure optimization; secondly, a collaborative planning model of superconducting fault current limiter configuration and grid structure optimization is established for solving the problem that short-circuit current exceeds the standard in new energy large-scale access, traditional power supply superposition and receiving end power grid coordinated development, the main problem is responsible for long-term planning decision, the target is to minimize the total investment cost, and the main problem is responsible for long-term planning decision making. The sub-problem is responsible for checking system safe operation constraints, and the target is to minimize the operation cost. And finally, solving the model by adopting an ADMM-based short-circuit current suppression model, and effectively suppressing the short-circuit current of the receiving-end power grid through loop iteration to minimize a relaxation error. The method provides technical support for solving the problem that the short-circuit current of the receiving-end power grid exceeds the standard, and is suitable for short-circuit current control of large-scale access of new energy to the receiving-end power grid.

This invention provides a method for detecting quench in a superconducting coil using leakage current, comprising the following steps: Step 1: Determine a first detection connection point on the main superconducting tape adjacent to a first current connection point, wherein the first detection connection point and the first current connection point are equipotential points; Step 2: Determine a second detection connection point on the sampling superconducting tape, wherein the second detection connection point and the second current connection point are equipotential points; Step 3: Connect a leakage current sampling circuit to the first and second detection connection points. If the leakage current sampling circuit detects leakage current, it is determined that quench exists in the main superconducting tape. This invention uses a leakage current sampling circuit to solve the problem of difficulty in sampling the quench voltage of superconducting magnets.

The invention provides a structure optimization method of a protection structure of a superconducting cable, the protection structure of the superconducting cable and a superconducting coil, and the structure optimization method comprises the steps: building a finite element simulation model of the protection structure, and determining a parameter range of design variables, sampling to obtain a plurality of first sample data sets including coil box thickness data and protective layer thickness data, and performing coupling analysis on the finite element simulation model to obtain a first stress result corresponding to each first sample data set, and constructing a response surface model based on the plurality of first sample data sets and the first stress result corresponding to each first sample data set, and defining an optimization equation and performing structure optimization on the protection structure by taking the sum of maximized stress margins as an optimization target in a constraint condition range so as to obtain a final protection structure optimization scheme. The optimization method provided by the invention has high optimization efficiency and can cover the global situation, so that the optimization result precision is improved.

The present invention relates to the technical field of superconducting materials. Disclosed are a MgB2 superconducting wire and a preparation method therefor. The preparation method comprises: melting Mg, Cu and Ti to obtain a Mg alloy ingot, processing the Mg alloy ingot to obtain a Mg alloy rod, loading the Mg alloy rod and B powder into a Nb tube to obtain a composite rod, processing the composite rod to obtain a single-core wire, loading the single-core wire into an oxygen-free copper tube, then loading into a monel tube in a densely-packed manner, and performing cold-forming treatment to obtain a multi-core composite wire; and performing high-temperature phase-forming heat treatment on the multi-core composite wire to prepare the MgB2 superconducting wire. In the present application, the Mg alloy rod containing Cu and Ti metal elements is used as a Mg source for preparing a MgB2 multi-core wire, so as to improve the plastic deformation ability of the Mg alloy rod in the wire treatment processes, and improve the grain boundary coupling, thereby improving the current carrying performance of the MgB2 superconducting wire.

The invention discloses a superconducting wire performance testing device which is characterized by comprising a sample rod, a conductor critical current testing framework, a conductor mechanical performance testing framework and a Dewar. During performance testing, the sample rod and the conductor critical current testing framework are detachably connected and located in the Dewar; or the sample rod and the conductor mechanical property testing framework are detachably connected and located in the Dewar. The testing device provided by the invention can be used for both critical current testing and mechanical performance testing.

The invention relates to the field of superconducting wire forming methods, in particular to a Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing, and the Nb3Sn superconducting wire preparation method based on multi-core wire liquid nitrogen cold drawing comprises the following steps: preparing ultrahigh-tin-content copper-tin alloy powder by adopting a gas atomization method; the oxygen-free copper pipe, the oxygen-free copper rod and the pure niobium rod are machined, and the oxygen-free copper pipe and an oxygen-free copper bolt plug are obtained; acid pickling, cleaning and drying are carried out; uniformly fixing the pure niobium rods in the oxygen-free copper pipe to form a combined blank; performing rotary swaging to a required size, and then continuously drawing to obtain a finished wire; carrying out pulse treatment, and then carrying out air cooling to room temperature; and finally obtaining the Nb3Sn superconducting wire. According to the method, the strength and plasticity of the oxygen-free copper pipe sheath are improved through a liquid nitrogen cold drawing method, the combined blank is subjected to subzero treatment in the rotary swaging and drawing process, the plasticity of the combined blank is improved, and the high-strength and high-plasticity Ni3Sn superconducting wire can be obtained.

The invention discloses an annular stator structure and a superconducting motor thereof, the annular stator structure comprises at least two iron cores forming an annular body, a plurality of windings, a plurality of support members, a plurality of fasteners, an insulating layer, a fixed outer ring and a fixed inner ring, each winding is sleeved on the annular body, each support member is sleeved on the annular body, and each fastening member is sleeved on the fixed inner ring. Each supporting piece is provided with a mounting groove, a winding is arranged in each mounting groove, the fastening piece is used for fixing two adjacent supporting pieces, the insulating layer covers and wraps the annular body, the insulating layer is located between the winding and the annular body, and the fixing outer ring surrounds the supporting pieces and is fixed to the outer diameter surfaces of the supporting pieces. The fixed inner ring is surrounded by the plurality of supporting members and is fixed with the inner diameter surfaces of the plurality of supporting members. The superconducting motor comprises the annular stator structure. Through the arrangement, the space occupancy of the winding at the end part can be reduced, so that the generation of an invalid magnetic field at the end part of the stator is reduced, and the motor power of the superconducting motor is improved.

The present invention discloses a superconducting motor quench detection method and apparatus based on rotational symmetry of a motor, belonging to the technical field of superconducting motor quench detection. The method includes: acquiring terminal voltages of each group of superconducting magnets in a superconducting motor, where the superconducting motor is pre-divided into at least two unit motors by using the rotational symmetry of the motor, and superconducting magnets located at corresponding positions are selected from the at least two unit motors as a group of superconducting magnets; calculating an absolute value of a terminal voltage difference of each group of superconducting magnets; and judging whether the absolute value exceeds a preset threshold, and if the absolute value exceeds the preset threshold, determining that the superconducting magnets are in a quench state. According to the present invention, induced voltages coupled by the terminal voltages of superconducting magnets are eliminated.

The invention belongs to the technical field of superconducting cables, and discloses a superconducting cable, a preparation method and a preparation device.The preparation method of the superconducting cable comprises the steps that a core wire, X superconducting wires and Y carbon fibers are prepared, the X superconducting wires and the Y carbon fibers are used for being woven on the surface of the core wire, and Y is smaller than or equal to X; spirally winding a hot melt adhesive film on the surfaces of the Y carbon fibers; the core wire, the superconducting wires and the carbon fibers are woven in a heating environment, and the X superconducting wires and the Y carbon fibers wound with the hot melt adhesive films are woven on the surface of the core wire under the heating condition; cooling the heated and braided superconducting cable through conveying; and after cooling, wrapping an insulating layer outside the superconducting braid layer formed by the superconducting wires and the carbon fibers. In conclusion, the superconducting braid layer of the superconducting cable is formed by mixing and weaving the superconducting wires and the carbon fibers, and the hot melt adhesive film is spirally wound on the surfaces of the carbon fibers, so that the core wires, the superconducting wires and the carbon fibers are bonded with one another after weaving, and the structural strength of the whole cable is improved.

The invention provides a water-cooled magnet magnetic field ripple shielding system, which belongs to the technical field of water-cooled magnets and comprises a thermostat and a superconducting block, the superconducting block is positioned in a constant-temperature cavity of the thermostat and is coaxial with a room-temperature hollow cavity in the center of the thermostat, liquid nitrogen is injected into the constant-temperature cavity, and when the superconducting block enters a superconducting state, the superconducting block is separated from the constant-temperature cavity. The sum of the induced magnetic flux variation of the water-cooled magnet power supply in the annular cavity of the superconducting block and the magnetic flux variation generated by the induced current of the superconducting block is zero, and the magnetic flux in the room temperature hollow cavity is in a steady state; the invention further provides a using method of the water-cooled magnet magnetic field ripple shielding system. Magnetic field ripples in an experiment sample space during a water-cooled magnet field stabilization experiment are shielded, the magnetic field stability of a water-cooled magnet magnetic field in the sample experiment space is ensured, the quality of the water-cooled magnet magnetic field is improved, and the signal-to-noise ratio of an experiment measurement signal is improved.

The present invention relates to a multi-objective optimization method for structure parameters of a superconducting cable, and a device and a medium. The method comprises the following steps: S1, acquiring structure parameters and performance parameters of a superconducting cable, setting constraint ranges of the structure parameters of the superconducting cable, constructing objective functions on the basis of the structure parameters and the performance parameters of the superconducting cable, and establishing a multi-objective optimization model of the structure parameters of the superconducting cable; and S2, iteratively solving the multi-objective optimization model of the structure parameters of the superconducting cable by means of an improved multi-objective grey wolf optimization algorithm to obtain optimal solutions of the structure parameters of the superconducting cable, wherein weight coefficients negatively correlated with the overall sensitivity indexes of the structure parameters of the superconducting cable are assigned to iteration coefficients in the multi-target grey wolf optimization algorithm so as to obtain the improved multi-target grey wolf optimization algorithm. Compared with the prior art, the present invention can further improve the optimization speed and optimization effect of structure parameters of superconducting cables.

The invention belongs to the technical field of superconducting material processing, and discloses a multi-barrier-layer MgB2 superconducting wire and a preparation method thereof. A plurality of groups of interlayers of the wire are composed of Cu / Ni / Nb, outer-layer copper serves as a stabilizer, Ni serves as a low-cost outer barrier layer, Ni and the outer-layer copper are mutually diffused in the hot extrusion process to form a stable Cu-Ni compound, and Nb foil is added into the Ni layer to serve as an inner barrier layer so as to restrain the diffusion problem of a small amount of Ni-Mg. According to the multi-barrier-layer MgB2 superconducting wire, Nb is greatly replaced by Cu / Ni, the raw material cost is remarkably reduced, the barrier layers are mutually diffused in the hot extrusion process to achieve metallurgical bonding, uniform deformation of the wire in the subsequent machining process is facilitated, the possibility of damage of the barrier layers is reduced, the current-carrying performance of the wire is improved, the Jc of the multi-barrier-layer MgB2 superconducting wire under 4.2 K and 3T is 5199-6271 A / mm < 2 >, and the service life of the multi-barrier-layer MgB2 superconducting wire is prolonged. And the current-carrying performance is obviously improved, and the application prospect is wide.

The invention relates to the technical field of superconducting material processing, in particular to a preparation method of an Nb3Sn superconducting wire. The method mainly comprises the steps that Nb-Zr alloy is loaded into the exterior and / or the center of a Sn-Cu single-core rod, oxide powder is filled between the Nb-Zr alloy and the Sn-Cu single-core rod, then the Sn-Cu single-core rod and the Nb-Zr alloy are loaded into a copper substrate, and Nb3Sn subcomponents are obtained after multi-pass stretching, forming and fixed-length cutting; and uniformly arranging the Nb3Sn sub-components in the copper pipe along the circumferential direction to form a bundle, and after multi-pass stretching, carrying out heat treatment and cutting to obtain the Nb3Sn superconducting wire. By introducing the artificial point pinning array in density gradient distribution, the critical current density of the Nb3Sn superconducting wire in a high magnetic field of 8T-16T is enhanced, the problems that an existing uniform artificial point pinning center scheme generates a matching effect and limits the actual application of the superconducting wire are solved, and the decline degree of the critical current density of the Nb3Sn superconducting wire in the high field is relieved.

A multi-objective optimization method for structural parameters of a superconducting cable, comprising steps of: S1, obtaining structural parameters and performance parameters of the superconducting cable, setting a constraint range of the structural parameters of the superconducting cable, based on the structural parameters and performance parameters of the superconducting cable, constructing an objective function, to establish a multi-objective optimization model of the structural parameters of the superconducting cable; and S2, through an improved multi-objective grey wolf optimization algorithm, iteratively solving the multi-objective optimization model of the structural parameters of the superconducting cable, to obtain an optimal solution for each of the structural parameters of the superconducting cable; where, to an iteration coefficient in a multi-objective grey wolf optimization algorithm, a weight coefficient negatively correlated with an overall sensitivity index of each of the structural parameters of the superconducting cable is given, to obtain the improved multi-objective grey wolf optimization algorithm.

The invention discloses a superconducting magnet outer joint welding auxiliary device, which belongs to the technical field of superconducting magnets, and comprises a lifting platform, a concave base, a concave slide way, two groups of bent clamp assemblies, an elastic component, a fastening screw rod and a threaded hole, a concave base is installed above the lifting table, a concave slide way is arranged in the concave base, the concave slide way and the two sets of bent clamp assemblies are installed in a nested and combined mode, and each set of bent clamp assembly is screwed and fixed with a superconducting tape through a screw; the pre-tightening spring is arranged between one side of the concave slide way and one side of the concave base and is matched with the concave slide way to provide tensioning force for the superconducting tape; a threaded hole is formed in the middle of the other side of the concave base. The fastening screw penetrates through the threaded hole and then applies pre-tightening force to the concave slide way. The problems that in the welding process of the high-temperature superconducting magnet, the tensile force needs to be manually provided, and the joint resistance is too large due to the fact that the pre-tightening force is not enough manually provided are solved.

The high-temperature superconducting tape defect detection device comprises a liquid nitrogen tank and a lifter connected below the bottom of the liquid nitrogen tank, a pay-off wheel and a take-up wheel are arranged on the two opposite sides of the liquid nitrogen tank respectively, and an inverted trapezoidal guide wheel set is arranged between the pay-off wheel and the take-up wheel. A high-temperature superconducting strip is released by the pay-off wheel, is guided downwards by the guide wheel set and then is withdrawn upwards by the take-up wheel, four sets of crimping assemblies are arranged on the material supporting base at intervals in the advancing direction of the high-temperature superconducting strip, and the interiors of the two sets of crimping assemblies close to the outside are jointly connected with a current source through wires capable of making contact with the high-temperature superconducting strip. And the inner part is connected with a voltage source. The critical current value of the high-temperature superconducting long belt is measured by adopting a crimping type four-lead method, so that the internal damage position of the belt is intuitively reflected, accurate searching is facilitated, meanwhile, the surface of the belt is prevented from being polluted, the interior of the belt is prevented from being damaged, the detected long belt can be used for the second time or subjected to a surface enhancement process, the detection efficiency is improved, and the manufacturing cost is reduced.

The utility model provides a high-temperature superconducting cable and a high-temperature superconducting magnet. The high-temperature superconducting cable comprises a metal coating layer and a plurality of superconducting sub-cables arranged in an array. The superconducting sub-cable comprises a superconducting conductor extending in the cable extending direction and a heat conduction layer wrapping the periphery of the superconducting conductor, and the periphery of the superconducting conductor is tightly attached to the inner wall of the heat conduction layer. A first attaching part and a first gap part are arranged between the outer walls of the heat conduction layers of the adjacent parts of any two adjacent superconducting sub-cables, and a second attaching part and a second gap part are arranged between the inner wall of the metal coating layer and the outer wall of the heat conduction layer of the closest superconducting sub-cable. The first gap portion and the second gap portion each form at least one cooling channel. The current of the quenched superconducting sub-cable can be shunted to the heat conduction layer of the adjacent superconducting sub-cable through the heat conduction layer, and the heat conduction layer can exchange heat with the cooling liquid of the cooling channel, so that the temperature of the superconducting sub-cable can be quickly reduced to a superconducting interval, and the cable can be prevented from being burnt down due to quenching.