805results about "Superconductors/hyperconductors" patented technology

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 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.

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 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 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 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.

Disclosed is a Josephson junction device including a first superconducting electrode and a second superconducting electrode spaced apart from the first superconducting electrode. Each of the first superconducting electrode and the second superconducting electrode includes CuxBi2Se3, and x is greater than or equal to 0.05 and less than or equal to 0.5.

The invention relates to the technical field of cable preparation, in particular to a superconducting semi-rigid cable made of high-purity aluminum and a preparation method thereof.The method comprises the steps that the high-purity aluminum is adopted as an inner conductor, and the inner conductor is preprocessed; coating the surface of the pretreated inner conductor with a PTFE mixture by using a pushing machine at normal temperature to obtain a normal-temperature pushing core wire; the qualified normal-temperature pushing core wire is wound on a cable reel and then placed in a vacuum high-temperature furnace to be subjected to vacuum sintering so as to obtain an inner conductor wrapped with an insulating layer; and the inner conductor wrapped with the insulating layer penetrates into the processed pure aluminum outer conductor tube, and the outer conductor is wrapped with PTFE to form an outer protective sleeve. According to the invention, the performance stability of the superconducting semi-rigid cable preparation can be improved.

The invention relates to a storage cryostat (2) for liquid helium (7), suitable for transferring liquid helium (7) from the storage cryostat (2) into an application cryostat (3), wherein the storage cryostat (2) comprises: - a vacuum-insulated helium vessel (6) for liquid helium (7), the helium vessel (6) having a vertical height HHB that can be filled with liquid helium (7), - a transfer line (4) for liquid helium (7), having an inlet opening (20) which opens into a lower region of the helium vessel (6), in particular into a lower fifth of the helium vessel (6), and - a convection-suppression system (9) which is arranged within the helium vessel (6) and impedes vertical convection of liquid helium (7) in the helium vessel (6), characterised in that the convection-suppression system (9) is formed in the helium vessel (6) over a height interval (IKS) with a vertical height HKS, where HKS ≥ 0.50 × HHB, and in that the convection-suppression system (9) impedes the vertical convection of liquid helium (7) in the helium vessel (6) over the region of the height interval (IKS) of the convection-suppression system (9). The invention provides a storage cryostat that enables simple and rapid transfer of liquid helium from the storage cryostat into the application cryostat, with minimised helium losses.

An example method described herein includes operating a first component of a circuit. The method also includes, while operating the first component, supplying a current to a superconducting wire that is thermally-coupled to the first component, and determining whether the superconducting wire has transitioned between a superconducting state to a non-superconducting state in response to the current. The method further includes measuring a temperature of the first component based on whether the superconducting wire transitioned between the superconducting state to the non-superconducting state in response to the current, and adjusting operation of the first component in accordance with a determination that the temperature exceeds a predetermined threshold temperature.

A method for manufacturing a semiconductor structure and a semiconductor structure are provided. The manufacturing method includes the following operations. A substrate is provided, and a first groove and a second groove are formed in the substrate, each of the first groove and the second groove having a depth in a first direction. The first groove includes multiple first sub-grooves arranged in the first direction, the second groove includes multiple second sub-grooves arranged in the first direction, and sidewalls of the first sub-grooves and sidewalls of the second sub-grooves are convex outwards. Word lines protruding away from the first groove each are formed at an interface of adjacent first sub-grooves. First source-drain layers formed on the sidewalls of the first sub-grooves, and second source-drain layers protruding away from the second groove each are formed at an interface of adjacent second sub-grooves.

The utility model provides a superconducting cable assembly, a superconductor transmission line and a star simulator. The superconducting cable assembly comprises a superconducting cable and a connector, the superconducting cable comprises a cable body part and a cable connecting part, and the cable connecting part is arranged in the connector in a penetrating mode in the axial direction of the connector; the connector comprises a clamping assembly, the clamping assembly comprises a sleeve and a pressing block, the sleeve comprises a first clamping block and a second clamping block which are oppositely arranged in the circumferential direction of the sleeve and fixed to each other, a cavity is defined by the first clamping block and the second clamping block, the pressing block is arranged in the cavity in the axial direction of the sleeve, and a through hole for a cable connecting part to penetrate through is formed between the pressing block and the second clamping block; the axial direction of the sleeve is parallel to that of the joint; the first clamping block locks and fixes the pressing block through the locking structure so that the pressing block can be connected to the periphery of the cable connecting part in a pressed mode in the radial direction of the sleeve, the position, relative to the locking and fixing position of the first clamping block, of the pressing block in the radial direction of the sleeve can be adjusted, and the hole diameter of the through hole can be adjusted. The superconducting cable assembly has better adaptability and maintainability.

The invention discloses a preparation method of stable in-situ 14: 24 AEC second-phase Bi-2212 powder, which comprises the following steps: preparing powder with specific components by controlling the components of a Bi-2212 precursor solution, and then adjusting by a fine heat treatment process to obtain the stable in-situ 14: 24 AEC second-phase Bi-2212 powder. According to the method disclosed by the invention, components of a Bi-2212 precursor solution are controlled, the components of Bi-2212 precursor powder after heat treatment and the molar ratio of Sr to Ca are monitored to be within a specific range, and a heat treatment process is matched for adjustment, so that stable generation of a 14: 24 AEC second phase in the Bi-2212 precursor powder is ensured; the self-generated 14: 24 AEC second phase can improve the critical current density of the Bi-2212 superconducting material; the method is easy to operate, low in cost, high in controllability and operability and suitable for being rapidly applied to the field of Bi-2212 superconducting material preparation.

The invention discloses a high-strength metal composite strip and a preparation method thereof.The high-strength metal composite strip is composed of a first outer-layer alloy, a middle-layer alloy and a second outer-layer alloy which are sequentially stacked, the first outer-layer alloy and the second outer-layer alloy are Ni-9wt.% W alloy, the middle-layer alloy is Ni-12wt.% W-3% Mo alloy, and the second outer-layer alloy is Ni-12wt.% W-3% Mo alloy. Wherein the content of the cubic texture of the composite strip is not lower than 90%, and the yield strength of the composite strip is not lower than 480 MPa. According to the composite strip, a strong cubic texture is formed on the surface layer, and the whole strip is high in strength and free of ferromagnetism.

The present invention provides: a MgB2 superconducting wire that has a barrier layer of highly uniform thickness covering a MgB2 core and that reduces MgB2 filament defects and is suitable for thinning and lengthening; a MgB2 superconducting wire manufacturing method for manufacturing the same; a superconducting coil using the same; and a magnetic generator including the superconducting coil. A MgB2 superconducting wire (200) comprises: a core material (210); a MgB2 filament (220) in which a MgB2 core (221) is covered with a barrier layer (222); and a metal sheath (230). The MgB2 filament (220) has a barrier layer (222) thickness on the outer peripheral side of the wire not more than three times the barrier layer (222) thickness on the core side of the wire. The method for manufacturing the MgB2 superconducting wire includes a step for forming a single core wire, a step for forming an embedded material, a surface reduction processing step, and a heat treatment step. The embedded material is formed by arranging the single core wire in a recess formed in the outer surface of the core material or by incorporating a spacer in a gap.

The invention belongs to the technical field of superconducting materials, and discloses an internal tin method Nb3Sn superconducting wire integrated with a piezoelectric sensing function and a preparation method of the internal tin method Nb3Sn superconducting wire. According to the method, a piezoelectric functional layer and a dielectric layer are prepared on the surface of a SnAl alloy rod, a CuAg alloy rod is installed after drilling to form a composite rod, the composite rod is inserted into an inner tin method Nb3Sn / CuNb composite pipe to be drawn into a subcomponent, then the subcomponent is bundled and installed into a Ta pipe and an oxygen-free copper pipe, and the wire is prepared through multiple times of stretching. The piezoelectric functional layer can convert micro strain into measurable electric signals, in-situ real-time monitoring of mechanical stress and the like in the wire rod is achieved, the CuAg alloy bar can stabilize the tensile strength of the wire rod and promote generation of an Nb3Sn phase, and on the premise that the superconducting performance is not affected, the operation reliability and safety of the high-field magnet under the extreme working condition are improved.

The invention discloses a method for improving the current downloading capacity of an REBCO superconducting layer in a magnetic field, and belongs to the field of superconductor materials, and the method comprises the steps: depositing an auxiliary layer on the surface of the REBCO superconducting layer, and carrying out the rotary grinding of the auxiliary layer on abrasive paper in cooperation with a cleaning solution, so as to introduce high-density dislocation into the REBCO superconducting layer, and cleaning the surface of the ground REBCO superconducting layer by using a cleaning solution, depositing a silver layer, and carrying out oxygen absorption treatment to obtain the final REBCO superconducting tape. According to the technical scheme, the on-site performance of the REBCO superconducting layer can be improved at low cost.

A motor includes a stator having a plurality of stator coils repeatedly disposed in a circumferential direction and a rotor configured to rotate around a rotating shaft, including a magnetic material generating rotational force by interacting with the plurality of stator coils. The magnetic material forms a band shape and is configured to be continuously disposed in the circumferential direction. The magnetic material is repeatedly arranged in the axial direction, forming a plurality of layers in the axial direction.

The invention belongs to the technical field of superconducting coaxial cable processing, and particularly relates to a superconducting coaxial cable and a preparation method and application thereof. The superconducting coaxial cable is composed of an outer conductor, a PTFE insulation module and an inner conductor arranged in the PTFE insulation module, the PTFE insulation module is a cylinder with a through hole in the center, supporting structures are symmetrically arranged at the two axial ends of the cylinder, a non-supporting structure is arranged in the middle of the cylinder, and the specific structure of the PTFE insulation module effectively regulates and controls the effective dielectric constant of an insulator. Therefore, the characteristic impedance of the superconducting coaxial cable is flexibly and finely adjusted, and the application requirement of a quantum computer signal transmission device on the characteristic impedance is met. The PTFE insulating module is prepared by pressing and sintering, and NbTi filaments are embedded into the prepared PTFE module by a heating method and are assembled with an outer conductor to form the superconductive coaxial cable. The method is simple in process, convenient to assemble and suitable for large-scale production.

The invention discloses a high-temperature superconducting strip with non-uniform distribution of critical current density and a preparation method thereof, and belongs to the technical field of high-temperature superconducting materials. The critical current density of the high-temperature superconducting strip is non-uniformly distributed in the width direction, the current distribution of the high-temperature superconducting strip can be regulated and controlled according to requirements, the high-temperature superconducting strip comprises a high-temperature superconducting layer, the chemical formula of the high-temperature superconducting layer is Re < 1 + a > Ba < 2 + b > Cu < 3 + c > O < 7-d + x% (mol) BaMO3, and Re is selected from Y, Gd, Eu and Sm; m is selected from Hf, Zr and Sn; the preparation method comprises the following steps: depositing the high-temperature superconducting layer on the strip substrate; depositing a metal silver layer on the deposited strip; and carrying out heat treatment on the deposited strip in an oxygen environment, and carrying out laser heat treatment after slitting and / or copper plating. The critical current density of the high-temperature superconducting strip in the width direction is non-uniformly distributed and controllable, the failure risk of the strip is effectively reduced, and the service performance of the strip is improved.

The invention relates to the technical field of cables, in particular to a production method of a low-temperature superconductive low-heat-leakage superfine coaxial cable, the outer diameter of the coaxial cable is smaller than or equal to 1.5 mm, and the cable is provided with a core material, a first superconductive layer, a PTFE dielectric layer, a second superconductive layer and a stainless steel pipe from inside to outside; the production method comprises the following steps: coating the periphery of the core material with the first superconducting layer to prepare the inner conductor; coating the periphery of the inner conductor with a PTFE layer to form a medium wire core; longitudinally penetrating the strip-shaped second superconducting layer through a round hole mold with the inner diameter gradually reduced, and rolling into a hollow pipe with the outer diameter slightly smaller than the inner diameter of the stainless steel pipe; and synchronously pulling the hollow pipe into the stainless steel pipe, pulling the medium wire core into the hollow pipe in the stainless steel pipe, and completing cable assembly. Pulling the cable through a round hole die with the inner diameter smaller than the outer diameter of the stainless steel pipe for reducing extrusion; in inert gas or high vacuum, the internal stress of the cable is released through heating. The second superconducting layer lining is longitudinally covered in the stainless steel tube, so that the problem that the inner wall of the extremely long and thin tube is difficult to uniformly plate the superconducting layer is solved.

The invention discloses a ductile niobium-titanium alloy material, a preparation method and application of the ductile niobium-titanium alloy material to preparation of a central conductor. The ductile niobium-titanium alloy material comprises, by weight, 44.5%-47.5% of Nb, 47.0%-50.0% of Ti, 1.0%-2.0% of Zr, 0.8%-2.0% of Mo, 0.2%-0.6% of V, 0.1%-0.3% of Al, 0.05%-0.12% of Si, 0.015%-0.025% of C, smaller than or equal to 0.035% of O, smaller than or equal to 0.01% of N, smaller than or equal to 0.25% of Fe + impurities and the balance Ti. The preparation process comprises the steps of double-vacuum melting, double-stage pre-homogenization heat treatment, gradient temperature control thermal machining and double-stage aging heat treatment, a fine grain beta matrix + dispersed alpha phase + nano MC carbide synergistic strengthening structure is obtained, and 3-10% of metastable beta phase is reserved. The central conductor made of the material has longitudinal and transverse absorption energy of not less than 180 J / cm and not less than 178 J / cm at-273 DEG C, longitudinal and transverse performance difference of not more than 8%, yield strength of not less than 780 MPa, salt spray corrosion resistance of not less than 1000 hours, and no obvious corrosion, and is suitable for manufacturing the central conductor of the low-temperature superconducting wire.

The invention discloses a preparation method of a novel integrated superconducting cable for a quantum computer, and relates to the technical field of superconducting composite cable processing, and the preparation method comprises the following steps: carrying out the wrapping insulation of an NbTi wire through a PTFE belt, then carrying out the on-line annealing and curing, carrying out the braiding through a tinned copper wire, enabling the tinned copper wire to penetrate into an NbTi capillary tube, carrying out the braiding through the tinned copper wire, and carrying out the cooling. Weaving signal transmission components are obtained; a plurality of NbTi rods are put into holes of a porous copper ingot, non-uniform parts at the head and the tail are sawed off after multi-pass drawing, and a tinned copper wire is adopted for weaving to obtain a woven current transmission component; and assembling the braided signal transmission component and the braided current transmission component into holes of the porous PTFE block to obtain the integrated superconducting cable. The superconducting cable for the quantum computer integrates signal transmission and current transmission functions by combining wrapping insulation, on-line annealing curing, weaving, drawing and assembling technologies, and saves the space of a dilution refrigerator.

The present invention relates to a cryogenic cooling system and method for particular use in cooling superconducting cables over extended distances, the system and method involving the evaporation of liquid cryogen though an array of spray generators thereby effecting heat transfer utilising the latent heat of vaporisation and optionally through sensible heat transfer in order to provide improved cryogenic cooling over extended distances.

The invention discloses a titanium core-green gold silicon-based composite magnetized wire, which adopts a three-layer framework of a titanium core, a green gold silicon-based transition layer and a copper stable layer. The titanium core is an NbTi alloy filament, the surface of the titanium core is oxidized to form a TiO2 nano film, and an Al2O3 buffer layer is deposited on the surface of the titanium core; the green gold silicon-based transition layer is Si3N4-Al2O3-TiC composite ceramic prepared by CVD (chemical vapor deposition), and endows the wire with a broadband magnetic shielding characteristic (mu 'is greater than or equal to 50, and mu' 'is less than or equal to 5) at a frequency band of 0.1-10 GHz; the copper stable layer realizes metallurgical bonding through cold rolling and annealing, and the mechanical strength is gt; and the pressure is 80 MPa. The Jc of the wire reaches 3.5 * 10 < 4 > A / cm < 2 > under a 4.2 K and 10T magnetic field and is increased by 40% compared with that of a traditional wire, the CVD temperature is reduced through TiO2 / Al2O3 interface optimization, and the titanium yield is increased to 92%. The device is customizable in function and suitable for the fields of superconducting magnets, quantum computing magnetic shielding, military reconnaissance, electromagnetic sensors and the like, and the performance and stability of equipment are remarkably improved.