CN101446609B - Measurement device of critical current properties of high-temperature superconducting tape - Google Patents
Measurement device of critical current properties of high-temperature superconducting tape Download PDFInfo
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- CN101446609B CN101446609B CN2008102271816A CN200810227181A CN101446609B CN 101446609 B CN101446609 B CN 101446609B CN 2008102271816 A CN2008102271816 A CN 2008102271816A CN 200810227181 A CN200810227181 A CN 200810227181A CN 101446609 B CN101446609 B CN 101446609B
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- 239000000523 sample Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 3
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- 229920000647 polyepoxide Polymers 0.000 claims description 3
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- 229910021521 yttrium barium copper oxide Inorganic materials 0.000 abstract description 32
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- 239000002826 coolant Substances 0.000 abstract 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract 2
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Abstract
The invention provides a measurement device of critical current properties of a high-temperature superconducting tape, and the device comprises a superconducting tape sample rack 1, a Hall magnetic field probe 2, a temperature probe 3, a background magnetic field magnet 4, a rotary rod 5, a rotary handle 6, a superconducting tape current lead wire 7, a background magnetic field magnet current lead wire 8, a low-temperature dewar 9, a cooling medium storage container 10, a low-temperature cooling medium 11, an extraction valve 12, a carburetor 13, a vacuum unit 14, a GM refrigerator 15, a background magnetic field magnet DC power supply 16, a superconducting DC power supply 17 and a system control, data acquisition and processing system 18. The device can simply and rapidly calculate the temperature, the background magnetic field and the impact factors on the change of the direction of the magnetic field thereof, thereby being applicable to the measurement of the critical current properties of yttrium barium copper oxide YBCO high-temperature superconducting tape.
Description
Technical field
The present invention relates to the 2nd generation critical current properties of high-temperature superconducting tape measurement mechanism, specially refer to yttrium and be oxide YBCO superconducting tape in the different temperatures interval, in different background magnetic field and the measurement implement device of magnetic direction lower critical current characteristics.
Background technology
Japanese rattan storehouse company (Fujikura) employing ion beam assisted depositing method (IBAD) in 1991, under the vacuum condition the metal (being generally nickel alloy) of the non-texture of softness with on obtained stable zirconia (YSZ) film of the highly textured yttrium of one deck, and with pulsed laser deposition (PLD) technology, on this base band coating epitaxial deposition yttrium be oxide YBCO, declare the 2nd generation belt material of high temperature superconduct appearance.Subsequently, U.S. Los Alamos laboratory (LANL) optimizes these technologies, announces to be formed in that superconducting critical current density reaches 1MA/cm under the 77K temperature in nineteen ninety-five
2Short sample, this result has caused worldwide sensation, and has attracted increasing research institution and scientist's intervention.
Than the 1st generation BSCCO belt material of high temperature superconduct, the 2nd generation yttrium be that oxide YBCO belt material of high temperature superconduct has a series of remarkable advantages: current density is higher on the physical characteristics, and the critical temperature that superconduction takes place has the potential of further raising; A.C.power loss is low, is easier to come fault current limiting by a definite form; Have under higher magnetic field than the better current capacity of the 1st generation high temperature superconducting materia at liquid nitrogen temperature, the anisotropy of its supraconductivity is more weak; The most important thing is to have saved noble metal silver, theoretical cost is far below the first generation.
In the overall performance of superconducting tape, critical current properties is one of most important characteristic wherein.Yttrium is that the critical current of oxide YBCO superconducting tape is the important parameter that high-temperature superconductor is used with the Changing Pattern of temperature, background magnetic field and magnetic direction, also is the important technology index of weighing the superconducting tape quality.
Yttrium is the Jc-B-θ critical current properties curve of oxide YBCO belt material of high temperature superconduct, as shown in Figure 1.Fig. 2 then be the 1st generation belt material of high temperature superconduct critical current variation characteristic curve.From Fig. 1 and Fig. 2 more as can be known, yttrium be oxide YBCO belt material of high temperature superconduct and the 1st generation belt material of high temperature superconduct similar, their critical current be temperature be again the function of background magnetic field and background magnetic field direction, simultaneously critical current also descends with the increase in temperature and magnetic field.But yttrium is an oxide YBCO belt material of high temperature superconduct critical current properties that is different from the 1st generation BSCCO belt material of high temperature superconduct is arranged, its critical electric current value can be reduced to minimum value near magnetic direction and its strip surface angle are 40 degree, when angle was spent near 90, critical current can increase again a little subsequently.And for the 1st generation belt material of high temperature superconduct, only when magnetic direction and strip surface angle be that 90 its critical currents when spending just can reduce to minimum value.
The method of traditional measurement superconduction belt material critical current is four leads method, common two lead-in wires are used for feeding certain DC current to superconducting tape, the two other lead-in wire is measured the superconducting tape terminal voltage, is the critical current that the quench criterion is determined this superconducting line with 1 μ V/cm.Fig. 3 is the synoptic diagram that traditional four leads method are measured critical current, and Fig. 4 is during four leads method are measured, and determines the define method of critical current for the quench criterion according to 1 μ V/cm.
But, when four leads method are measured critical current properties, can not make complete evaluation and test to the performance of superconducting tape.Especially be oxide YBCO belt material of high temperature superconduct for yttrium, since have be different from the 1st generation belt material of high temperature superconduct special critical current properties, its critical electric current value is not only with variation of ambient temperature, but also the influence that changed by background magnetic field and background magnetic field direction.Four traditional leads method are owing to considering the influence that these factors are brought, so and inapplicable.Need be based on four leads method, design a kind of novel apparatus, take all factors into consideration the concrete influence that environment temperature, background magnetic field and magnetic direction change, measuring yttrium is the critical current properties of oxide YBCO belt material of high temperature superconduct, thereby obtain more comprehensive yttrium is oxide YBCO belt material of high temperature superconduct critical current performance parameter, for the high-temperature superconducting magnet optimal design provides precondition.
Summary of the invention
The present invention designed a kind of simple, fast, can accounting temperature, the influence factor that changes of background magnetic field and magnetic direction thereof, being suitable for yttrium is the device that oxide YBCO critical current properties of high-temperature superconducting tape is measured.
Measuring method of the present invention is based on four leads method, constructed a vacuum plant model machine that is integrated with the decompression cooling of background magnetic field generator, use this device, realize that yttrium is the measurement of the critical current properties of oxide YBCO superconducting tape under different warm areas, different magnetic field and magnetic direction.Measurement mechanism of the present invention is multiple functional, can accurately obtain under different temperatures, different background magnetic field and the magnetic direction, and yttrium is the critical current variation characteristic family of curves of oxide YBCO belt material of high temperature superconduct.This measurement mechanism is an oxide YBCO superconducting tape characteristic for the overall understanding yttrium, and production and the application of carrying out yttrium and be oxide YBCO superconducting tape have important practical value.
A kind of superconduction belt material critical current characteristic measuring device of the present invention is characterized in that comprising the superconducting tape sample rack, Hall magnetic field probe, temp probe, the background magnetic field magnet, swingle, rotating handles, the superconducting tape current feed, background magnetic field magnet current lead-in wire, cooled cryostat, the heat eliminating medium storage container, low-temperature cooling media, evacuating valve, carburetor, vacuum unit, GM refrigeration machine, the provided magnet direct supply, direct supercurrent power supply, system's control, data acquisition and disposal system.Heat eliminating medium storage container wherein, evacuating valve, carburetor, the vacuum unit, GM refrigeration machine, direct supply, system's control, data acquisition and disposal system place room temperature environment, the superconducting tape sample rack, Hall magnetic field probe, temp probe, the background magnetic field magnet, swingle, the provided magnet current feed, the superconducting tape current feed all places in the middle of the heat eliminating medium of low-temperature (low temperature) vessel.The inner background magnetic field magnet with smooth air-gap that is provided with of described low temperature Dewar, superconducting tape can be in the environment of steady magnetic field in the air gap of this magnet.
Measurement mechanism of the present invention, it is characterized in that on described sample rack, having laid the intermediate plate that feeds DC current for superconducting tape, and on the superconducting tape surface, lay the 2-3 group according to certain distance and measure joint, also placed the magnetic field hall probe simultaneously in the superconducting tape centre position to measure the uniform magnetic field intensity of air-gap central area to measure the quench voltage signal.
Measurement mechanism of the present invention is characterized in that support, suspension rod and the swingle of described superconducting tape sample rack, fixed background magnetic field magnet is that epoxide resin material is processed into.
Measurement mechanism of the present invention, it is characterized in that the cooled cryostat of described cryogenic system by sealing, vacuum unit, vacuum pump, carburetor are formed, be that the vacuum unit is connected on the cooled cryostat with sealing, behind the liquid nitrogen of packing in the Dewar, by the pumping speed of control vacuum unit, realize that the cooled cryostat temperature inside reduces gradually, in cooled cryostat inside, when vacuum tightness that the vacuum unit extracts reach the highest after, continue to use the GM refrigeration machine temperature of the inner liquid nitrogen of Dewar further reduced.
The yttrium of the present invention's design is that oxide YBCO critical current properties of high-temperature superconducting tape measurement mechanism has following effect and advantage:
(1) can measure yttrium is the critical current properties of oxide YBCO belt material of high temperature superconduct under factor affecting such as temperature, background magnetic field and magnetic direction variation;
(2) design the cryogenic system of decompression cooling, thereby can utilize the cooled with liquid nitrogen agent to realize that yttrium is oxide YBCO superconducting tape and measures at 77K or the critical current properties that is lower than in the 77K temperature range interval;
(3) the direct current magnet in the background magnetic field generating means is that oxide YBCO superconduction belt material critical current feature measurement provides the back of the body for yttrium, can be as required DC current by the control magnet coil obtain steady magnetic field under the given magnetic induction density value;
(4) in the air-gap of provided magnet, yttrium is that oxide YBCO belt material of high temperature superconduct can rotate in 0-90 degree scopes with sample rack, thereby realizes the change of background magnetic field direction by the variation equivalence of strip surface and magnetic field angle;
(5) control and test macro can realize to the direct supercurrent power supply Long-distance Control, to the monitoring of cryogenic system temperature and background magnetic field size, gathering and handle the yttrium that is recorded by four leads method simultaneously is the critical current properties parameter of oxide YBCO superconducting tape.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
It is oxide YBCO critical current properties of high-temperature superconducting tape that Fig. 1 shows yttrium;
Fig. 2 shows the critical current properties of BSCCO belt material of high temperature superconduct;
Fig. 3 shows four leads method measuring principles;
Fig. 4 shows the define method that yttrium is an oxide YBCO belt material of high temperature superconduct critical current;
Fig. 5 shows measurement mechanism of the present invention and forms synoptic diagram, wherein: 1-superconducting tape sample rack, 2-Hall magnetic field probe, 3-temp probe, 4-background magnetic field magnet, the 5-swingle, the 6-rotating handles, 7-superconducting tape current feed, 8-background magnetic field magnet current lead-in wire, the 9-cooled cryostat, 10-heat eliminating medium storage container, 11-low-temperature cooling media, 12-evacuating valve, the 13-carburetor, 14 vacuum units, 15-GM refrigeration machine, 16-provided magnet direct supply, 17-direct supercurrent power supply, the control of 18-system, data acquisition and disposal system;
Fig. 6 shows the background magnetic field magnet elevation cross-sectional view of band air-gap iron core, wherein: 19-provided magnet Line 1 circle, No. 2 coils of 20-provided magnet, 21-air-gap, 22-superconducting tape, 23-iron core.
Embodiment
As shown in Figure 5, the device of using the inventive method comprises superconducting tape sample rack 1, Hall magnetic field probe 2, temp probe 3, background magnetic field magnet 4, swingle 5, rotating handles 6, superconducting tape current feed 7, background magnetic field magnet current lead-in wire 8, cooled cryostat 9, heat eliminating medium storage container 10, low-temperature cooling media 11, evacuating valve 12, carburetor 13, vacuum unit 14, GM refrigeration machine 15, provided magnet direct supply 16, direct supercurrent power supply 17, system's control, data acquisition and disposal system 18.Heat eliminating medium storage container wherein, evacuating valve, carburetor, the vacuum unit, the GM refrigeration machine, direct supply, system's control, data acquisition and disposal system place room temperature environment.The superconducting tape sample rack, the Hall magnetic field probe, temp probe, the background magnetic field magnet, swingle, the provided magnet current feed, the superconducting tape current feed all places in the middle of the heat eliminating medium of low-temperature (low temperature) vessel.When carrying out yttrium when being the measuring critical current properties of oxide YBCO superconducting tape, based on four leads method, laid on sample rack to yttrium is the electric current intermediate plate of oxide YBCO superconducting tape feeding direct current, and be on the oxide YBCO superconducting tape surface at yttrium, laying the 2-3 group according to certain distance and measure joint to measure the quench voltage signal, is that the Hall magnetic field probe has also been placed to measure the uniform magnetic field intensity of air-gap central area in oxide YBCO superconducting tape centre position at yttrium simultaneously.In addition for fear of the damage of superconducting tape, realize the good insulation performance effect, yttrium is that support, suspension rod, the swingle of oxide YBCO superconducting tape sample rack, fixed background magnetic field magnet also all adopts epoxy resin to process, guarantee to be out of shape at low temperatures little, have physical strength preferably, rotate free.
Fig. 6 is the elevation cross-sectional view of the background magnetic field magnet of band air-gap iron core.Superconducting tape places on the sample rack, and rotates in air-gap with sample rack, thereby equivalence realizes the change of background magnetic field direction, and the background magnetic field size is realized by control direct current magnet coil current value.Because the iron core magnetic permeability is more than ten thousand times of air, can in air-gap, form a uniform field region thereby the magnetic flux that the direct current magnet produces is most of through iron core, so just obtained a stable background magnetic field.
In the test, at first, utilize the vacuum unit that cooled cryostat is vacuumized, obtain the superconducting tape probe temperature interval of 64K-77K by the decompression cooling system.After arriving desired temperature, feed certain DC current for the coil of background magnetic field magnet, can obtain the magnetic induction density of air-gap according to calibration value by current feed.Then under uniform temperature, certain background magnetic field, rotate in 0-90 degree scope by the rotating handles drive sample rack of spending the outside top of rotation Dewar lid, under the different rotary angle, adopt four leads method, utilizing system's control, data acquisition and disposal system to measure yttrium is the critical current properties of oxide YBCO superconducting tape, forms data file and exports.
Adopting measurement mechanism of the present invention just can realize measuring yttrium more easily is the critical current properties that oxide YBCO belt material of high temperature superconduct changes with temperature, background magnetic field and magnetic direction.This apparatus structure is simple, and is multiple functional, easy to operate, easy to use, is the ideal equipment device of the research of superconductor applications and manufacturing enterprise, detection superconducting tape characteristic parameter.
Invention has been described according to specific exemplary embodiment herein.It will be conspicuous carrying out suitable replacement to one skilled in the art or revise under not departing from the scope of the present invention.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (5)
1. the measurement mechanism of a critical current properties of high-temperature superconducting tape, it is characterized in that this device comprises superconducting tape sample rack (1), Hall magnetic field probe (2), temp probe (3), background magnetic field magnet (4), swingle (5), rotating handles (6), superconducting tape current feed (7), background magnetic field magnet current lead-in wire (8), cooled cryostat (9), heat eliminating medium storage container (10), low-temperature cooling media (11), evacuating valve (12), carburetor (13), vacuum unit (14), GM refrigeration machine (15), provided magnet direct supply (16), direct supercurrent power supply (17), system's control, data acquisition and disposal system (18); Described heat eliminating medium storage container, evacuating valve, carburetor, the vacuum unit, the GM refrigeration machine, the provided magnet direct supply, the direct supercurrent power supply, system's control, data acquisition and disposal system place room temperature environment; The superconducting tape sample rack, the Hall magnetic field probe, temp probe, the background magnetic field magnet, swingle, provided magnet current feed, superconducting tape current feed all place in the middle of the heat eliminating medium of low-temperature (low temperature) vessel; The inner background magnetic field magnet with smooth air-gap that is provided with of described cooled cryostat, superconducting tape can be in the environment of steady magnetic field in the air gap of this magnet.
2. measurement mechanism as claimed in claim 1, it is characterized in that on described sample rack, having laid the intermediate plate that feeds DC current for superconducting tape, and on the superconducting tape surface, lay the 2-3 group according to certain distance and measure joint, also placed the magnetic field hall probe simultaneously in the superconducting tape centre position to measure the uniform magnetic field intensity of air-gap central area to measure the quench voltage signal.
3. as claim 1,2 arbitrary described measurement mechanisms, it is characterized in that support, suspension rod and the swingle of described superconducting tape sample rack, fixed background magnetic field magnet is that epoxide resin material is processed into.
4. as claim 1,2 arbitrary described measurement mechanisms, it is characterized in that the cooled cryostat of the cryogenic system of this device by sealing, vacuum unit, vacuum pump, carburetor are formed, be that the vacuum unit is connected on the cooled cryostat with sealing, behind the liquid nitrogen of packing in the cooled cryostat, pumping speed by control vacuum unit, realize that the cooled cryostat temperature inside reduces gradually, in cooled cryostat inside, when vacuum tightness that the vacuum unit extracts reach the highest after, continue to use the GM refrigeration machine temperature of the inner liquid nitrogen of Dewar further reduced.
5. measurement mechanism as claimed in claim 3, it is characterized in that the cooled cryostat of the cryogenic system of this device by sealing, vacuum unit, vacuum pump, carburetor are formed, be that the vacuum unit is connected on the cooled cryostat with sealing, behind the liquid nitrogen of packing in the cooled cryostat, pumping speed by control vacuum unit, realize that the cooled cryostat temperature inside reduces gradually, in cooled cryostat inside, when vacuum tightness that the vacuum unit extracts reach the highest after, continue to use the GM refrigeration machine temperature of the inner liquid nitrogen of Dewar further reduced.
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2008
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|---|---|---|---|---|
| CN102426812A (en) * | 2011-11-15 | 2012-04-25 | 赵杰 | High-temperature superconducting comprehensive experiment instrument |
| CN102426812B (en) * | 2011-11-15 | 2014-04-16 | 赵杰 | High-temperature superconducting comprehensive experiment instrument |
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