812 results about "High temperature superconducting" patented technology

The invention relates to a 1500MPa-grade nickel-based alloy for a second-generation high-temperature superconducting baseband and a preparation method of the 1500MPa-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, 15.0 to 17.0 percent of Mo, 4.5 to 9.5 percent of W, 5.0 to 7.0 percent of Fe, 0.3 to 0.7 percent of Mn, 0.01 to 0.05 percent of Si, 0.1 to 0.2 percent of V, 0.1 to 0.5 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 hastelloy, the strength of a matrix is improved by increasing the W element content, matching an optimized heat treatment process and combining cold deformation; the content of C is controlled, precipitation of carbides is controlled, and it is ensured that the carbides are completely dissolved in 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. By adopting the component control strategy and the processing preparation and heat treatment process, the nickel-based alloy with the yield strength of 1,300 MPa or above, the tensile strength of 1,500 MPa or above and the ductility of 7.5% or above can be obtained after annealing is conducted for 5 min at the temperature of 900 DEG C, and the requirement of a second-generation high-temperature superconducting high-performance metal base band is met.

The invention discloses a high-temperature superconducting electric maglev vehicle multi-mode damping device based on an electromagnetic shunting technology. The high-temperature superconducting electric maglev vehicle multi-mode damping device comprises a coil system and a vehicle suspension frame. Wherein the coil system comprises a vehicle-mounted superconducting magnet, an 8-shaped suspension guide coil and a propulsion coil; the vehicle suspension frame carries a vehicle-mounted superconducting magnet, a low-temperature container, a damping coil and an external circuit module. Accurate design of electromagnetic parameters is achieved through a plurality of branch parallel circuits, dynamic responses of different frequencies can be effectively matched, and multi-mode vibration reduction is achieved in a passive mode. An optimized damping effect can be provided for various vibration modes in a rail system without depending on an active control system, and the vibration reduction performance of the system is remarkably improved. Aiming at different vibration frequencies, adjustment can be carried out by replacing components such as capacitors and inductors in the branches, the structure is simple, and the cost is low.

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 relates to a 1300MPa-grade nickel-based alloy for a second-generation high-temperature superconducting baseband and a preparation method of the 1300MPa-grade nickel-based alloy, and belongs to the technical field of materials. The high-strength wear-resistant steel comprises the following chemical components in percentage by weight: 15.0%-17.0% of Cr, 15.0%-17.0% of Mo, 3.0%-4.5% of W, 5.0%-7.0% of Fe, 0.3%-0.7% of Mn, 0.01%-0.05% of Si, 0.1%-0.2% of V, 0.1%-0.5% of Co, 0.1%-0.2% of Al, 0.040%-0.080% of N, Clt and the balance of Fe. 0.002%, Plt; 0.005%, Slt; 0.002%, Olt; 0.002%, and the balance being nickel. The purification smelting process is adopted, the oxygen content in the alloy is reduced, the inclusion content is controlled, and the high purity of the material is guaranteed. By adopting the component control strategy, the heat treatment process and the final cold machining preparation, the nickel-based alloy with the yield strength being 1100 MPa or above, the tensile strength being 1300 MPa or above, the ductility being 15% or above and the product of strength and elongation being 20 GPa.% or above can be obtained after annealing is conducted for 5 min at the temperature of 900 DEG C, and the requirements of a second-generation high-temperature superconducting high-performance metal base band are met.

The invention relates to a high-temperature superconducting flywheel energy storage device and a control method of the high-temperature superconducting flywheel energy storage device. The problems that in the prior art, an electro-magnetic inductor motor has large standby loss, and the suspension force cannot be adjusted can be solved through the high-temperature superconducting flywheel energy storage device and the control method of the high-temperature superconducting flywheel energy storage device. The high-temperature superconducting flywheel energy storage device comprises a flywheel rotor. A stator core; a first high-temperature superconducting excitation coil; the stator iron core, the first high-temperature superconducting magnet exciting coil and the second high-temperature superconducting magnet exciting coil are arranged around a rotating shaft of the flywheel rotor in the circumferential direction of the flywheel rotor, and the first high-temperature superconducting magnet exciting coil and the second high-temperature superconducting magnet exciting coil are arranged on the two sides of the stator iron core in the extending direction of the rotating shaft respectively; the permanent magnet surrounds the rotating shaft and is arranged on one side of the flywheel rotor in the extending direction of the rotating shaft; and the control coil is arranged around the rotating shaft, and the control coil is arranged on the same side as the permanent magnet relative to the flywheel rotor.

The invention relates to the technical field of diodes, and particularly discloses a high-temperature superconducting diode structure model which is used for solving the problems that an integrated circuit is high in power consumption and low in speed, and a traditional semiconductor technology is difficult to meet requirements. The semiconductor diode has the problems of power consumption and time delay, the research of the existing superconducting diode mostly focuses on low-temperature superconducting, low working temperature hinders the application and contradicts with the original intention of low power consumption, and the high-temperature superconducting diode which can work in a liquid nitrogen environment is urgently needed, including geometric, material and physical models. The geometric model is provided with a substrate with a superconductive microbridge strip with an asymmetric structure and metal films at two ends, the physical model contains an external magnetic field and current, and electromagnetic transport characteristics are analyzed through simulation modeling; through geometric structure and material selection and physical model setting, electromagnetic transport characteristics are analyzed by using the corrected RCSJ model, the geometric structure of the superconducting micro-bridge strip is optimized, and the problems of power consumption and speed of an integrated circuit are solved.

The invention discloses a fusion device high-temperature superconducting magnet quenching detection method based on deep learning, and the method comprises the steps: obtaining a magnet quenching voltage noise signal, a magnet current signal, a plasma current signal and an eddy current signal from the historical operation data of a fusion device, and taking the signals as a data set to train a deep learning model; a magnet current signal, a plasma current signal and an eddy current signal during operation of the device are continuously collected in real time, and a magnet quenching voltage noise signal is calculated in real time by using an offline trained deep learning model; and deducting the magnet quench voltage noise signal calculated in real time from the magnet quench voltage detection signal acquired in real time to obtain a real magnet quench voltage signal, thereby realizing accurate detection of the high-temperature superconducting magnet quench of the fusion device. According to the method, quench of the high-temperature superconducting magnet is detected timely and accurately by means of the strong learning ability of deep learning, and safe and stable operation of the high-temperature superconducting magnet in a fusion device is guaranteed.

The invention discloses a high-temperature superconducting Tokamak cold shield assembly assembling system and method. The high-temperature superconducting Tokamak cold shield assembly assembling system comprises a positioning assembly, a welding assembly, a supporting frame, supporting legs, a locking mechanism and a driving mechanism. The invention relates to the technical field of welding tools. According to the high-temperature superconducting Tokamak cold shield assembly assembling system and method, the supporting frame is arranged to be installed around the lower-layer high-temperature superconducting Tokamak cold shield, the positioning assembly and the welding assembly can be placed on the supporting frame in sequence, and the positioning assembly can abut against the lower-layer high-temperature superconducting Tokamak cold shield by half; the high-temperature superconducting Tokamak cold shield suspended on the upper layer to be put down is positioned and guided, it is guaranteed that the high-temperature superconducting Tokamak cold shield can be accurately in butt joint with the high-temperature superconducting Tokamak cold shield on the lower layer, and then the problem that butt joint dislocation of the heavy high-temperature superconducting Tokamak cold shield is difficult to adjust is solved. And after the positioning assembly is taken down, the welding assembly is replaced, the welding assembly can be driven by the driving mechanism to rotate around the high-temperature superconducting Tokamak cold shield along the supporting frame for welding, and manpower is saved.

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 provides a high-temperature superconducting rotor local hot spot eliminating device for circulating cold helium, and relates to the technical field of superconducting synchronous phase modifiers, the high-temperature superconducting rotor local hot spot eliminating device comprises a supporting sleeve, six sets of superconducting coil assemblies are uniformly installed in the circumferential direction of the supporting sleeve, and each set of superconducting coil assembly comprises a step core block fixedly connected to the surface of the supporting sleeve. Three double-layer superconducting wire plates are uniformly arranged on two sides of the stepped core block, and each double-layer superconducting wire plate is fixedly connected with a runway type superconducting coil. The annular guide rail driving mechanism drives the driving wheel to rotate and cooperates with the driven wheel to drive the transmission belt to rotate, that is, the transmission belt drives the movable cold guide plate to rotate along the runway type sliding rail and move to the local hot spot generation position to exchange heat with the movable cold guide plate. According to the invention, the purpose of cooling local hot spots is achieved, and the problems of local temperature rise and local quenching of the magnet are avoided.

The invention relates to the technical field of critical current testing of superconducting tapes, in particular to a critical current testing device, system and method for a double-sided high-temperature superconducting tape. A critical current testing device for a double-sided high-temperature superconducting tape comprises a low-temperature box body which is provided with an accommodating space, the accommodating space is internally provided with an unwinding roller and a winding roller, the unwinding roller and the winding roller are respectively suitable for winding the double-sided high-temperature superconducting tape to be tested, and the double-sided high-temperature superconducting tape to be tested is provided with a first surface and a second surface which are correspondingly arranged; the first measuring assembly is suitable for measuring critical current and voltage of the first surface of the to-be-measured double-sided high-temperature superconducting tape; and the second measuring assembly is suitable for measuring the critical current and voltage of the second surface of the to-be-measured double-sided high-temperature superconducting tape. The problem that when the double-sided superconducting tape is measured, the lead current of the YBCO1 superconducting layer does not pass through the resistance layer and cannot reach the YBCO2 superconducting layer, the quench of the voltage cannot be detected, and the measurement error of the critical current is caused is solved.

The invention discloses a hot forming preparation method of a high-temperature superconducting MgB2 wire rod based on resistance heating. The method comprises the following steps: 1, carrying out cold rotary swaging deformation after tubing to obtain a single-core complex; 2, after resistance heating, carrying out hot drawing deformation to obtain a single-core composite round wire; thirdly, the single-core composite round wires are bundled and assembled and then subjected to cold rotary swaging, and a multi-core bundled and assembled complex is obtained; 4, after resistance heating, carrying out hot drawing deformation to obtain a multi-core clustered composite MgB2 round wire; and 5, carrying out vacuum heat treatment to obtain the high-temperature superconducting MgB2 wire rod. Resistance heating is carried out before hot drawing deformation, so that the center Mg rod and the middle Nb barrier layer obtain excellent thermoplasticity, coordinated and uniform plastic deformation of the center Mg rod and the middle Nb barrier layer and the outer Cu sheath and uniform flowing of filled powder are achieved, and the MgB2 superconducting wire which is free of knots on the surface, free of core breakage in the interior and uniform in deformation is obtained and is suitable for the field of high-temperature superconducting. And meanwhile, the machining pass is reduced, the machining time is greatly shortened, and the preparation process is simplified.

The invention discloses a method for repairing a high-temperature superconducting tape. The method comprises the following steps: S1, placing a to-be-repaired area of the high-temperature superconducting tape in a reaction container; s2, the reaction container is kept at a certain oxygen partial pressure, and annealing treatment is conducted on the to-be-repaired area; s3, after annealing treatment is completed, the high-temperature superconducting tape is taken out after the reaction container is cooled; wherein the to-be-repaired area is a dead pixel area in the high-temperature superconducting tape and an area with a certain length on two sides of the dead pixel area in the length direction of the tape. According to the repairing method, cutting treatment is not needed, that is, the original strip does not need to be damaged basically, and the dead pixel area can be repaired only by conducting proper heat treatment on the dead pixel area.

Described is a high-temperature superconductor (HTS) cable, comprising a plurality of HTS tapes, wherein all or part of a cross-section of at least one of the HTS tapes are removed to reduce the current carrying capacity of the HTS tape. Also described is a method for shaping the current density of a high-temperature superconductor (HTS) cable, wherein the HTS current density is carried by HTS tapes, and wherein the method comprises selective mechanical removal of all or part of the cross section of one or more of HTS tapes.

The invention provides a hoisting machinery amplitude variation process energy management method and system based on a supercapacitor, and relates to the technical field of energy management, and the method comprises the steps: calculating the theoretical energy demand of an amplitude variation process through a neural network prediction model, correcting a dynamic grouping coefficient to obtain a power distribution coefficient, and calculating the power distribution coefficient; and taking the result as the upper limit of the charging and discharging power of each group of super capacitors, and adjusting the charging and discharging current through a self-adaptive PI controller. When the amplitude variation angle is reduced, regenerative braking energy exceeding the rechargeable power of the super capacitor is stored in a high-temperature superconducting energy storage inductor, and the energy is charged into the super capacitor according to a power distribution coefficient when the condition is allowed; when the amplitude variation angle is increased, the output power ratio of the main power supply to each group of super capacitors is optimized by adopting a dynamic programming algorithm, and power cooperative control is realized through a sliding mode and an active-disturbance-rejection controller, so that the stability of the system voltage is ensured. The energy utilization efficiency can be effectively improved, the service life of the supercapacitor is prolonged, and the system stability is ensured.

The invention discloses a super-large-scale silicon single crystal growth method based on a high-temperature superconducting magnetic control technology, and relates to the technical field of silicon single crystal growth, and the method comprises the following steps: setting and calibrating an initial magnetic field intensity, and combining a gradient graphite felt heat conductivity coefficient function to optimize temperature field uniformity; a dynamic magnetic field regulation and control mechanism is introduced in the melt stage, melt convection is inhibited through flow velocity-magnetic field joint control, and oxygen concentration monitoring is synchronized; a multi-physics coupling simulation and multi-objective optimization algorithm is adopted in the crystal growth stage, the magnetic field intensity, the heating power and the crystal pulling parameters are adjusted in real time, and the oxygen content and the growth rate are balanced; and the tail stress is relieved through a gradient field reduction technology, and finally, the low-defect and high-uniformity silicon single crystal is obtained. Melt flow and temperature field uniformity are accurately regulated and controlled through a high-temperature superconducting magnetic control technology, dynamic monitoring and a multi-target optimization algorithm are combined, the growth quality of silicon single crystals is remarkably improved, the defect rate and energy consumption are reduced, and meanwhile efficient and stable production of large-size crystals is achieved.

The invention relates to the technical field of high-temperature superconducting coils, and provides a method for analyzing stress distribution in a high-temperature superconducting coil winding process, which comprises the following steps of: S1, establishing a skeleton model and setting material parameters; s2, applying a boundary load to the skeleton model and carrying out stress analysis to obtain a stress distribution result of the skeleton model for winding a first turn of coil; s3, a coil model is established, material parameters are set, the number of turns of the coil model is i, and i = 1; s4, applying a boundary load to the coil model and performing stress analysis to obtain a stress distribution result of the coil model when the (i + 1) th turn of coil is wound; s5, controlling the coil model to carry out iteration from i = 2 to i = N-1 through an external program; and S6, obtaining a final stress distribution result of the coil model. According to the method, the thought of the disassembly winding process and the finite element analysis method are combined, the coil model is controlled through an external program to carry out iteration, and the winding stress solution of the irregular coil with multiple turns is met.

The invention discloses a dynamic load adjustment-liquid nitrogen cold storage integrated high-temperature superconducting power grid capacity expansion system and method. The system comprises a data preprocessing system, a dynamic load adjustment device, a liquid nitrogen cold storage device, a state monitoring device, a high-temperature superconducting cable capacity expansion device and a communication coordination system. The method comprises the steps of generating a standardized feature matrix through normalization processing; multi-time-scale load prediction is realized through an LSTM (Long Short-Term Memory) network, a collaborative instruction set is generated by adopting an optimal scheduling engine of mixed integer linear programming, and adaptive closed-loop control based on a fuzzy PID (Proportion Integration Differentiation) algorithm is realized; a multi-physics field coupling optimization model of a real-time cold energy distribution diagram is adopted to realize power grid capacity improvement; and the time sequence consistency of the whole system is coordinated and circulation is formed. Zero-resistance power transmission is realized in a liquid nitrogen temperature region by adopting the high-temperature superconducting cable, the loss is reduced to 0.5% or below, and the transmission capacity is improved by 3-5 times; the load demand is predicted in combination with the AI algorithm, and the renewable energy consumption rate is increased to 95%.

The tension and winding speed adjustable high-temperature superconducting coil winding machine comprises a control system and a base, a pay-off mechanism, a wire guiding mechanism and a take-up mechanism are arranged on the base, and the pay-off mechanism, the wire guiding mechanism and the take-up mechanism are all electrically connected with the control system; the pay-off mechanism, the wire guiding mechanism and the take-up mechanism each comprise an angle adjusting assembly, the angle adjusting assemblies of the pay-off mechanism and the wire guiding mechanism are each provided with a height adjusting assembly, the height adjusting assemblies are each provided with a pay-off assembly or a wire guiding assembly, and the angle adjusting assembly of the take-up mechanism is provided with a take-up assembly. Through cooperative work of the control system, the tension sensor and the high-precision servo motor, accurate tension control is achieved, the problems that due to uneven tension, a strip is broken and deformed, or the internal stress of a coil is concentrated, or the coil is loosened and the turn-to-turn resistance is too large are solved, the wound coil is good in tightness and consistency, and the winding quality is improved. And the quality and performance of the coil are improved.

The present invention provides an appealing, fast, and cost-effective alternative to conventional nuclear fusion reactors. An ultra-compact spherical tokamak that combines three key features aimed at accelerating fusion energy as a viable energy source, these features are spherical type tokamaks, negative triangularity plasma shape and high-temperature superconducting coils. More specifically, the tokamak includes a toroidal vacuum vessel and a magnetic field system configured to confine a high temperature plasma. The magnetic field system includes a solenoid having a sand-hourglass shape; toroidal field coils having an inverse D-shaped design and high temperature superconductor (HTS) material; and poloidal field coils, external to the vacuum vessel. The vacuum vessel has a cross-section with similar inverse D-shape as the toroidal field coils.

The invention provides a distributed connector framework applied to a parallel winding type superconducting coil and a winding method thereof, the distributed connector framework comprises an upper framework and a lower framework which are oppositely arranged, the lower framework comprises a lower disc and a central column, and the central column is arranged on the lower disc and is in a spiral protrusion shape; a spiral gap exists between the spiral lines of the central column, the inner end of the strip is embedded in the strip groove and is fixedly arranged in a strip track formed by the spiral gap, and the inner side of the superconducting coil is supported by the central column; the upper framework comprises an upper disc and an outer column, the outer column is arranged on the upper disc and is in a circular-ring-shaped protrusion shape, the outer column and the center column are coaxially arranged and located outside the center column, a gap is formed in the outer column and used for leading out the strip outer end of the superconducting strip, and the outer side of the superconducting coil is supported through the outer column. The spiral central column structure is adopted, the contact area between the end strip and the framework is increased based on the spiral central column structure, the joint resistance of the parallel winding type high-temperature superconducting coil can be further reduced, and the heat loss problem of the joint is effectively relieved.

The invention provides an attractive, fast and cost-effective alternative method for conventional nuclear fusion reactors. An ultra-compact spherical Tokamak which combines three key features intended to accelerate fusion energy as feasible energy sources, the features being a spherical Tokamak, a negative triangle plasma shape and a high temperature superconductor coil.

The invention belongs to the technical field of high-temperature superconducting detection, and discloses a quench detection sensor based on a high-temperature superconducting material and a detection method.The quench detection sensor comprises an inner layer structure composed of a metal base band, a first insulating layer and a high-temperature superconducting material layer, and a second insulating layer arranged between the metal base band and the high-temperature superconducting material layer; the second insulating layer covers the areas, not at the two ends, of the outer side of the inner layer structure, and a metal base band or a high-temperature superconducting material layer is arranged between the second insulating layer and the first insulating layer; the two ends of the short-circuit connection metal are fixedly connected to the first end of the metal base band and the first end of the high-temperature superconducting material layer respectively; the number of the connecting terminals is two, the two connecting terminals are jointly used for being connected with a detection voltmeter and a detection current source through wires, and the two connecting terminals are fixedly connected to the second end of the metal base band and the second end of the high-temperature superconducting material layer respectively. The quench detection sensor is high in detection reliability.

The invention provides an REBCO high-temperature superconducting cake coil based on V2O3 thin film composite strip insulation and a preparation method. The V2O3 thin film composite strip is formed by compounding a copper base strip and a V2O3 thin film; the REBCO high-temperature superconducting cake coil is formed by winding an REBCO high-temperature superconducting strip with a copper sheath and a V2O3 film composite strip in parallel, and also can be directly wound by an REBCO high-temperature superconducting strip with a V2O3 film coating; when the temperature is below 150K, V2O3 is an inter-turn insulating material of the REBCO high-temperature superconducting cake coil, and the REBCO high-temperature superconducting cake coil can be excited quickly; when the temperature exceeds 150K, the V2O3 is changed into a conductive material, the resistivity is reduced to 10 <-3 > omega.cm magnitude, the REBCO high-temperature superconducting cake coil is an uninsulated magnet, the quench propagation speed is accelerated, and the thermal stability of the high-temperature superconducting cake coil is improved.

A bearing and flywheel system can include a first bearing portion having an opening of a first dimension there through and a central longitudinal axis, a second bearing portion having a second dimension, the second dimension being smaller than the first dimension, and a flywheel coupled to the second bearing portion. The bearing portions can include high-temperature superconductor(s) and / or magnets. The second bearing portion can be disposed at least partially within the opening through the first bearing portion. A gap can exist between an outer surface of the second bearing portion and an inner surface of the first bearing portion. The second bearing portion can be configured to rotate relative to the first bearing portion.

A thermodynamic study is performed to identify suitable refrigeration cycles for emerging application to a high-temperature superconductor (HTS) fusion system. According to recent reports on a compact and efficient fusion system, HTS magnets are supposed to operate at about 20 K by forced-flow cooling of helium gas. In addition to the main cryogenic load for the magnets, there are other cooling requirements, including the refrigeration of a thermal shield and current leads. In order to compose a closed refrigeration system without liquid-nitrogen supply or any boil-off loss, modified Brayton cycles are designed to cover the cooling loads with a circulation loop of a coolant for the magnets, the thermal shield, and the current leads. Innovative design is also proposed to integrate the cooling loop with the refrigeration cycle, as helium gas is used as a coolant and a refrigerant.

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.

An on-line program control excitation power supply with quench protection for a high-temperature superconducting magnet comprises a single-chip microcomputer for receiving control data, outputting control voltage through digital-to-analog conversion (DAC) of the single-chip microcomputer, and magnetizing a magnet coil through current stepping; a sampling signal is output to the liquid crystal screen to display corresponding voltage and current values in real time after being processed by the single-chip microcomputer analog-to-digital conversion ADC; voltage signals at the two ends of the magnet coil are sampled and returned to the single-chip microcomputer to be processed, when high voltage occurs, it is judged that the voltage signals are abnormal voltage signals, quench protection is carried out, the single-chip microcomputer outputs control signals to cut off connection between the magnet coil and the excitation power source, and residual energy of the magnet coil is released through the high-power thyristor. The provided excitation power supply has the characteristics of high power, high stability, good repeatability and good linearity; performing numerical control stepping output, gradually applying current to the superconducting coil, and slowly establishing a magnetic field; effective quench protection is achieved, and it is guaranteed that a magnet coil is not damaged by quench.