109results about "Superconductive properties measurements" patented technology

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 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.

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 discloses a method and a system for detecting shielding performance of a shipborne paleomagnetic laboratory, and relates to the technical field of paleomagnetic laboratory detection. According to the invention, a plurality of measurement points are arranged in the shipborne paleomagnetic laboratory, so that the magnetic induction intensity data in the shipborne paleomagnetic laboratory can be accurately and fully measured, and the accuracy of subsequent calculation of the internal average residual magnetism and the shielding coefficient of the shipborne paleomagnetic laboratory is improved; the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory is further improved; the ship navigation state of the ship is continuously adjusted, the operation environment of the shipborne paleomagnetic laboratory is fully considered, and the situation that the shielding performance of the shipborne paleomagnetic laboratory is detected inaccurately due to the navigation uncertainty of the ship and the complex magnetic environment of the ship navigating in the ocean is avoided in a multi-ship navigation state and multi-measurement-point mode. The accuracy of the internal average residual magnetism and the shielding coefficient is improved through the dynamic characteristics of the ship, and the detection accuracy of the shielding performance of the shipborne paleomagnetic laboratory is ensured.

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 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 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 invention provides a forced flow cooling system for horizontal testing of an arc-shaped superconducting magnet, and relates to the technical field of superconducting magnet testing devices. The forced flow cooling system for the horizontal test of the arc-shaped superconducting magnet comprises a first transmission pipeline configured to transmit helium; a second transfer line configured to transfer liquid helium; the air inlet pipeline is respectively connected with the first transmission pipeline and the second transmission pipeline and is wound on the arc-shaped superconducting magnet; wherein the helium is used for cooling the arc-shaped superconducting magnet to a first preset temperature under the condition that the first transmission pipeline is communicated with the gas inlet pipeline and the second transmission pipeline is blocked from the gas inlet pipeline; and under the condition that the first transmission pipeline is disconnected from the gas inlet pipeline and the second transmission pipeline is communicated with the gas inlet pipeline, the liquid helium is used for cooling the arc-shaped superconducting magnet at the first preset temperature to a second preset temperature.

The invention discloses a temperature-variable superconducting magnet low-temperature testing system and method, and relates to the technical field of superconducting magnet low-temperature testing. The system specifically comprises a superconducting magnet circulation loop which is configured to be communicated with a superconducting magnet to be tested to form a closed circulation channel for helium flow; the heat exchanger is arranged in the superconducting magnet circulation loop and is configured to cool helium in the superconducting magnet circulation loop through heat exchange with an external low-temperature medium; the helium circulating pump is arranged in the superconducting magnet circulating loop and is used for driving helium to perform forced flow circulation in the closed-loop circulating channel; the temperature control assembly comprises a heater arranged in the superconducting magnet circulation loop; wherein the flow and the temperature of helium entering the superconducting magnet to be tested are controlled by adjusting the helium circulating pump and the heater. The invention aims to design a test system which does not need an expensive refrigerator, is simple and convenient to operate and can realize accurate control of a wide temperature zone and a forced flow cooling environment.

The invention belongs to the field of superconducting material measurement, and discloses a sample rod for testing the anisotropy of a critical current of a superconducting strip. The sample rod comprises a mechanical transmission device, a sample mounting platform, a Hall sensor and an electric signal transmission device, the mechanical transmission device comprises a worm and worm wheel transmission set, a straight gear set and a transmission shaft, and the transmission shaft is vertically connected between a worm wheel and the straight gear set. The sample mounting platform comprises a sample table and a copper current terminal, the sample table is arranged in the middle of the copper current terminal, and the copper current terminal is fixedly connected with the straight gear set; the Hall sensor is arranged on the back of the sample table and electrically connected with the electric signal transmission device. According to the invention, the sample mounting platform is driven to complete continuous rotation based on a dual transmission mechanism of the worm and worm gear transmission group and the straight gear group, and meanwhile, the Hall sensor is combined to realize critical current measurement of the superconducting tape under low-temperature, large-current, different-size and angle magnetic fields.

The invention discloses a multi-field coupling fatigue test device and method for a high-temperature superconducting tape, and belongs to the field of superconducting tape fatigue tests.The multi-field coupling fatigue test device for the high-temperature superconducting tape comprises a fatigue testing machine, and a test container used for providing a low-temperature field is arranged in a test area of the fatigue testing machine; a clamp assembly used for fixing a sample to be tested is arranged in the experiment container, the clamp assembly is connected with a current assembly used for providing an electric field, and a magnet assembly used for providing a magnetic field is arranged in the experiment container. According to the multi-field coupling fatigue test device and method for the high-temperature superconducting strip, the limitation of an existing test means is broken through, and a reliable experimental platform and application value are provided for mechanical property research and service life evaluation of superconducting materials and other low-temperature service materials.

The invention discloses a critical current nondestructive testing device for a joint-free high-temperature superconducting tape. The critical current nondestructive testing device comprises a testing tape reel, a fixing plate, a testing tape reel motor rotating shaft, an air heater, a tension sensor, a wire guide wheel, a magnetizing device, a double-hole Hall sensor, a liquid nitrogen Dewar and the joint-free high-temperature superconducting tape. The test tape reel is used for placing the joint-free high-temperature superconducting tape; the testing tape reel motor rotating shaft is used for connecting the motor and the testing tape reel, and the air heater is used for blow-drying the tape to prevent the surface of the superconducting tape from freezing. The tension sensor is used for carrying out real-time and on-line monitoring on the tension applied to the superconducting tape. The wire guide wheel is of a bearing supporting structure and comprises a built-in deep groove ball bearing or sliding bearing. And the magnetizing device is used for magnetizing the high-temperature superconducting tape. The double-hole Hall sensor can detect magnetic field distribution on the surface of the magnetized strip. The double-hole Hall sensor is provided with a double-hole structure, and the slit strip is detected through the wire passing double holes.

The invention provides a quantum device and a preparation method thereof, and the quantum device comprises a superconducting ferromagnet structure which comprises a superconducting layer and a ferromagnet layer disposed on the superconducting layer; and the detector comprises a coplanar waveguide resonator, the coplanar waveguide resonator is in alternating current coupling with the superconducting ferromagnet structure, and the coplanar waveguide resonator is configured to detect the superconducting ferromagnet structure. According to the invention, the circuit quantum electrodynamics is introduced into the research of the superconducting ferromagnet structure, the coupling strength between the superconducting ferromagnet structure and the coplanar waveguide resonator is improved, and the accurate detection of the superconducting ferromagnet structure in the microwave range is realized; the efficiency and speed of quantum information processing are improved by realizing high-efficiency conversion and transmission between the magnetic vibrator and the photons.

The invention discloses a superconducting magnet excitation and back field testing device and method, and relates to the technical field of superconducting magnet excitation and test.The superconducting magnet excitation and back field testing device comprises a supporting structure and a coil, the supporting structure is internally provided with an excitation cavity and a detection cavity, the excitation cavity is used for arranging a superconducting magnet, and the detection cavity is used for detecting the superconducting magnet; a detection device can be arranged in the detection cavity, the coil is wound outside the supporting structure and surrounds the excitation cavity, the coil can be electrified, and the detection device can detect the intensity of a magnetic field generated by the excited superconducting magnet. And the magnetic field of the superconducting magnet can be detected in a background magnetic field.

The invention relates to the technical field of magnet quenching detection, and discloses a magnet quenching detection method based on attention mechanism feature fusion, which comprises the following steps: preprocessing existing time sequence data and to-be-detected time sequence data of a superconducting magnet to obtain an existing data signal frame and a to-be-detected data signal frame; extracting time domain features and frequency domain features from the existing data signal frame and the data signal frame to be detected; performing convolutional feature extraction on the existing data signal frame and the data signal frame to be detected by using a convolutional neural network; for an existing data signal frame, splicing the extracted time domain features and frequency domain features with the convolution features, extracting attention weights of the spliced features by using an attention network, and obtaining fusion features by using the extracted attention weights; using a deep neural network as a classifier to carry out quench detection on the fused features to obtain a detection result; training the detection model, and determining an optimal model; and obtaining a detection result of the to-be-detected data signal frame according to the optimal model. Therefore, magnet quenching detection is realized.

The invention belongs to the field of superconducting material measurement, and discloses an external field critical current test sample rod under axial strain of a superconducting tape, which comprises a mechanical transmission device, a worm vertical to a left-right rotation trapezoidal screw rod, and a worm gear connected with the middle part of the left-right rotation trapezoidal screw rod through an optical axis key; the axial strain loading platform and the nut seat are respectively screwed into a left thread part and a right thread part of the left-handed and right-handed trapezoidal screw rod, the sample holder is supported and fixed through convex parts at two sides of the nut seat, the copper current terminals are respectively fixed at two ends of a platform part of the sample holder, and the strain gauge is used for being fixed on a middle shaft in the middle of a superconducting tape to be tested; and the electric signal transmission device is electrically connected with the strain gauge. According to the invention, the left-handed and right-handed trapezoidal screw rods are driven to rotate, so that the pair of nut seats with opposite threads are linearly opened and closed, the superconducting tape to be measured on the sample holder tape welding platform is driven to generate axial strain, and the critical current of the superconducting tape under the axial strain in a background magnetic field is measured.

The invention discloses a CORC-CICC high-temperature superconducting conductor stability evaluation method and a related device. The method comprises the following steps: acquiring structural information of a CORC-CICC high-temperature superconducting conductor; according to the structural information of the CORC-CICC high-temperature superconducting conductor, determining the shunting temperature, the critical current, the minimum quenching energy and the quenching propagation speed of the CORC-CICC high-temperature superconducting conductor; and evaluating the stability of the CORC-CICC high-temperature superconducting conductor according to the shunting temperature, the critical current, the minimum quenching energy and the quenching propagation velocity of the CORC-CICC high-temperature superconducting conductor, and the method and the related device can evaluate the stability of the CORC-CICC high-temperature superconducting conductor.

Methods and systems for estimating localization lengths in hybrid superconductor-semiconductor quantum devices are described. A method for estimating localization lengths in a hybrid superconductor-semiconductor quantum device includes constructing a statistical model for extracting localization lengths based on an implicit description of nonlocal conductance measurements associated with a physical representation of the hybrid superconductor-semiconductor quantum device. The method further includes, using a processor, estimating the localization lengths in the hybrid superconductor-semiconductor quantum device by a joint prior distribution enforcing smoothness over a function of gate voltages and extracted localization lengths for the hybrid superconductor-semiconductor quantum device.

The invention discloses a combined thin film parameter measurement device, a measurement device and a regulation and control method. The combined thin film parameter measuring device comprises a substrate; the preset doped component content of the combined film is continuously changed from the first end to the second end in a gradient manner along the first direction; the plurality of groups of measuring electrodes are respectively led out from the side edges of the thin film, and the joints of the groups of measuring electrodes and the combined thin film are arranged along the first direction so as to respectively measure parameters corresponding to different doping component areas; the regulation electrode is positioned on the side surface of the combined film; wherein a gap is formed between the combined thin film and the regulation electrode, ionic liquid can be added to the substrate, the ionic liquid at least covers the combined thin film, the regulation electrode and the gap between the combined thin film and the regulation electrode, and the ionic liquid is used for changing the carrier concentration of the combined thin film. According to the method, combined film samples with different components do not need to be frequently prepared, the time consumption of line connection can be remarkably reduced, the manpower and material resource consumption is saved, and the data accuracy and the acquisition efficiency are improved.

Techniques for reel-to-reel assessment of a high-temperature superconducting (HTS) tape are provided. The techniques include a cryocooler-powered cryogenic system configured to cool the HTS tape in a background magnetic field. The cryocooler-powered cryogenic system may be free of liquid cryogenic. The cryocooler-powered cryogenic system may include a measurement zone, where the magnetic field is perpendicular to the path of the HTS tape. The techniques may also include a Hall sensor array within the measurement zone. The Hall sensor array may be configured to scan a magnetic field at a surface of the HTS tape to measure a screening-current-induced field and separate it from the background magnetic field. The techniques may also include a data acquisition (DAQ) module operably coupled to the Hall sensor array. The DAQ module may be configured to oversample Hall voltages.

The present invention discloses a critical property testing device for superconducting tapes in a multi-deformation mode. The device includes: a framework support and a vacuum chamber composed of upper and lower layers, an adjustable tension component passing through the upper and lower layers of the framework support and the vacuum chamber and extending downward to the cryogenic test layer, a tape clamping tooling fixedly connected to the bottom end of the adjustable tension component, and current lead terminals arranged on the superconducting tape to be tested. By dividing the testing device into common parts, non-common parts, fixed structures, and non-fixed structures, the present invention realizes stress adjustment in a multi-deformation mode through the same transmission device, eliminates the interference factors in the superimposed stress by setting an axisymmetric structure and comparing and observing the stress difference between the superconducting tape without loaded current and the superconducting tape with loaded current during the loading process of the critical current of the tape, and improves the accuracy of stress testing.

The present invention discloses a six-point method roll-to-roll drive type high-temperature superconducting long tape critical current testing device and method, including a testing chamber, a chamber cover and a pay-off chamber. The chamber cover is provided above the testing chamber, and a pay-off chamber is provided at the middle position of the top of the chamber cover. Driving chambers are provided on both sides of the top of the chamber cover. U-shaped frames are provided on both sides of the bottom inside the testing chamber, and baffles are provided on the tops of the U-shaped frames. Pneumatic cylinders are provided inside the two driving chambers, and the output ends of the two pneumatic cylinders respectively extend into the two U-shaped frames. The present invention uses a six-point type test. In the main measurement section, according to the measurement standard of the superconducting tape sample, when the voltage measurement value reaches a cut-off voltage value greater than V C , the current source stops conducting current, and the measurement of this section is completed. In the two sub-measurement sections, the upper limit value of the voltage set artificially is higher than the set multiple of the cut-off voltage value of the above-mentioned main measurement section relative to V C to prevent damage to the sub-measurement sections.

The application discloses a quench characteristic test sample rod suitable for high magnetic field and quasi-adiabatic working conditions, which comprises a lead sleeve and a vacuum cavity module, the bottom end of the lead sleeve is detachably connected with the vacuum cavity module through a butt flange, the vacuum cavity module comprises a heat insulation centering mechanism arranged in an inner cavity, the upper and lower ends of the heat insulation centering mechanism are respectively provided with an upper copper ring and a lower oxygen-free copper ring, and an embedded copper heater is sleeved on the heat insulation centering mechanism, a plurality of superconducting tape samples to be tested are uniformly and circumferentially arranged on the outer wall of the embedded copper heater, and the two ends of each superconducting tape sample to be tested are respectively welded and fixedly connected with the upper copper ring and the lower oxygen-free copper ring. The application utilizes the indium compression sealing of the vacuum cavity module to provide quasi-adiabatic working conditions for testing, can reduce the heat exchange between the normal state region of the superconducting tape and the environment, reduce the heat loss of the superconducting tape in the conduction process, and thus improves the accuracy of the quench propagation characteristic test of the superconducting tape.

A superconducting magnet system for fusion reactor includes a superconducting magnet unit, an integrated power supply system and a quench diagnostic system. The superconducting magnet unit includes a superconducting coil module and a cryogenic refrigeration module. The superconducting coil module includes a toroidal field coil, a poloidal field coil and a centric solenoidal magnet module. The integrated power supply system includes a power supply module, a power supply monitoring module, and an alternating current (AC) / direct current (DC) power distribution module connected to the power supply module and the power supply monitoring module. The quench diagnostic system includes a resistive voltage diagnostic module, a distributed optical fiber diagnostic module and a voiceprint diagnostic module.

The application discloses a REBCO tape loss of superconductivity propagation test method and system, and relates to the technical field of superconducting material testing. The REBCO tape loss of superconductivity propagation test method gradually applies current and monitors voltage and temperature data to analyze the propagation characteristics and recovery process of the loss of superconductivity event. After the loss of superconductivity occurs, the system records and reduces the current in real time to analyze the recovery capacity of the tape. In combination with the loss of superconductivity propagation index and the recovery capacity index, corresponding safety test measures are performed for different test stages. The application comprehensively and dynamically analyzes the loss of superconductivity event of the REBCO tape by introducing the loss of superconductivity propagation index. The prior art usually only records the voltage and temperature data when the loss of superconductivity event occurs, and does not consider the speed and range of the loss of superconductivity propagation in the tape. By combining real-time voltage, temperature data and current changes and other factors, the propagation index can quantify the propagation process of the loss of superconductivity from one point to other points, and overcomes the limitations of the traditional method.

The invention discloses a segmented damage detection device for a high-temperature superconductive double-pancake coil, which belongs to the technical field of high-temperature superconductive strip testing and comprises a bottom support plate, a bottom plate, the high-temperature superconductive double-pancake coil, a cover plate and an external voltage detection device. The bottom plate is arranged on the bottom supporting plate, the high-temperature superconducting double-pancake coil is located on the upper surface of the bottom plate, and the cover plate covers the upper portion of the high-temperature superconducting double-pancake coil. A plurality of contact screws respectively pass through a plurality of array-distributed bottom plate test threaded holes or cover plate test threaded holes in the cover plate and the bottom plate, and are in contact with the surface of the high-temperature superconductive double-pancake coil through screwing, and the tops of the contact screws are connected with an external voltage detection device through welding; the voltage value between every two contact screws is tested, the position where abnormal voltage occurs is positioned, and the damaged section in the high-temperature superconducting double-pancake coil is judged. Through segmented detection of the array type threaded contacts, accurate positioning of the damaged position of the double-pancake coil is achieved, and the problem that in the prior art, a defect area is difficult to accurately recognize is solved.

The present invention provides a method and device for judging the boiling criticality of a cooling surface of a superconducting magnet cooled by liquid helium, and relates to the field of thermal simulation technology. The superconducting magnet is immersed in the liquid helium. The method comprises: establishing a three-dimensional physical model of the superconducting magnet, and obtaining the three-dimensional magnetic field distribution of the superconducting magnet based on the three-dimensional physical model; obtaining the critical heat flux density distribution of the superconducting magnet based on the three-dimensional magnetic field distribution and the gravity field; obtaining the AC loss heat power distribution of the superconducting magnet based on the three-dimensional magnetic field distribution, performing thermal simulation analysis on the AC loss heat power distribution, and determining the heat flux density distribution of the cooling surface of the superconducting magnet; and comparing the heat flux density distribution with the critical heat flux density distribution to determine the boiling state of liquid helium on the surface of the superconducting magnet.

The present application is applied to the technical field of superconducting applications, and discloses an offline system for a superconducting magnet and a refrigeration assembly, comprising a helium gas pipe assembly, a cold head, a self-sealing joint set, a two-position four-way valve set, a compressor, and a power supply that supplies power to the compressor. In the present application, the compressor and the cold head are connected by means of the helium gas pipe assembly, helium gas is used as a medium in contact with a thermal interface, and self-sealing joints are arranged at the connection and disconnection points of helium gas pipelines, so that the problems such as frost formation at the thermal interface can be avoided, greatly reducing the offline-to-reconnection time of the system. In addition, no foreign gas is introduced during the entire offline-to-reconnection process, thereby improving the reliability of the offline system for the superconducting magnet and the refrigeration assembly.