CN105004901A - Critical current test sample rod for straight short sample superconducting wire in multi-angle field - Google Patents
Critical current test sample rod for straight short sample superconducting wire in multi-angle field Download PDFInfo
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- CN105004901A CN105004901A CN201510297762.7A CN201510297762A CN105004901A CN 105004901 A CN105004901 A CN 105004901A CN 201510297762 A CN201510297762 A CN 201510297762A CN 105004901 A CN105004901 A CN 105004901A
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Abstract
The invention discloses a critical current test sample rod for a straight short sample superconducting wire in a multi-angle field. The critical current test sample rod comprises two current leads. An epoxy sheath wraps the two current leads. One end of the epoxy sheath is provided with a sealing flange. The inner walls of both ends of the epoxy sheath are provided with bakelite support rings respectively. Low-temperature epoxy glue is disposed between the outer walls of the two current leads and the inner walls of the two ends of the epoxy sheath. The two current leads both extend out of the epoxy sheath. The ends of the two current leads, without a sealing flange, are connected to two lower-end current leads. The other end of each lower-end current lead is fixed to an epoxy supporting plate. The critical current test sample rod is suitable for an experiment testing the performance of a superconductive strand, and no such similar structure exists in China. The structure enables reliable contact at low temperature, allows heavy currents, is easy to operate when a sample is replaced, and will not damage a superconducting wire.
Description
Technical field
The present invention relates generally to large scale superconducting magnet field, particularly relates to a kind of straight short sample superconducting line multi-angle field critical current test specimen holder, the critical current test under multi-angle background magnetic field for low temperature and the straight short sample of high temperature superconductive wire.
Background technology
Large scale superconducting magnet is the key of full superconduction controllable magnetic constraint fusion reactor, and its major function constrains in magnetic condenser by ultra-high temperature plasma, realizes controlled nuclear fusion reaction.In ITER design, magnet all adopts NbTi and Nb3Sn low temperature superconducting material.The research of experimental reactor is shown that device is larger, magnetic field is higher, more easily realize controlled fusion reaction and generating, following demonstration reactor and commercial stack operation parameter (power >2GW, magnetic field >15T, electric current >100kA, carrying >150 ton/rice) far above current ITER design parameter.By the restriction of low-temperature superconducting wire upper critical field, adopt Conventional cryogenic superconductor can not prepare magnet more than 22T, the magnet of coiling more highfield requires that material still can keep comparatively high critical current densities in more than the magnetic field of 20T.Therefore, superconductor and the high field magnet of seeking to have more excellent comprehensive performance are that following controllable magnetic retrains the problem that must solve in HCSB-DEMO and commercialization process.Ceramic oxide high temperature superconducting materia has high irreversibility field and excellent magnetic field current-carring characteristic because of it under 4.2K, is therefore the ideal material building high field magnet.In high temperature superconducting materia, Bi2Sr2Ca1Cu2OX (Bi-2212) is the material that uniquely can be prepared into isotropy circle line, even if it still can the engineering current density that has significant practical applications of carrying tool up to 45T in 4.2K outfield, is therefore the high temperature superconducting materia of (>20T) application prospect under current most High-Field.
Before Design and manufacture 10KA tests with CICC conductor, need to carry out detailed research to the performance of Bi2212 wire rod, comprise the mechanical property under normal temperature and low temperature, Electromagnetism Characteristics and the impact etc. of strain on its superconductivity, because practical conductor is operated in comparatively complicated high ambient field.Therefore, research background magnetic field intensity and angle can provide important data for Future Design cable and conductor to the impact of superconducting line critical current.
Current experiment Bi2212 superconducting line adopts powder-in-tube technique (PIT) to add high keto sectional pressure heat treatment technics and is prepared from.The mechanical characteristic of the Bi2212 superconducting line core material after thermal treatment close to pottery, if stressed or be out of shape comparatively conference and make core rupture, to its performance impact comparatively greatly, so will strand be avoided to be impacted or be out of shape in test process as far as possible.
In the critical performance test experiments of superconducting line, four leads method are adopted to measure.
Experiment content mainly comprises: the critical current of superconducting line and the test of n value during 4.2K under different magnetic field.
Test sample is immersed in liquid helium and carries out energising experiment, needs to design a set of reliable specimen holder, fixing test superconducting sample, and pass into DC current to sample in certain background magnetic field, test sample critical current.
The superconducting line critical performance test specimens product bar structure that at present each low temperature test room adopts in the world is not quite similar, in order to can safely, accurately, reliable, the critical performance of measuring superconducting line efficiently, must consider when specimen holder designs following some:
1, sample is easy to dismounting;
2, under low temperature, sample skeleton contact resistance is little;
3, current feed optimal design;
When 4, putting into specimen holder, current feed is easy to cooling to save liquid helium;
5, during replacing sample, specimen holder is easy to dry;
6, reliable electrical isolation.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, critical current test specimen holder in a kind of straight short sample superconducting line multi-angle field is provided, for fixing test superconducting sample, and pass into DC current to sample in certain background magnetic field, test sample critical current.
The present invention is achieved by the following technical solutions:
A kind of straight short sample superconducting line multi-angle field critical current test specimen holder, it is characterized in that: include two current feeds, epoxy sheath is arranged with outside two current feeds, one end of epoxy sheath is provided with seal flange, bakelite support ring is respectively equipped with in the two ends inwall of epoxy sheath, Low-temperature epoxy glue is filled with between the outer wall of the two ends inwall of epoxy sheath and two current feeds, two current feeds all stretch out outside epoxy sheath, two current feeds not installing one end of seal flange go between with two lower current and are connected, the other end of two lower current lead-in wires is fixed in epoxy back up pad.
Described current feed is oxygen-free copper current feed, and lower current lead-in wire is by oxygen-free copper and Nb
3sn superconducting line forms.
One end of described epoxy back up pad is movably installed with dismountable circular shaped motion plate, and namely one end of two lower current lead-in wires is fixed on described circular shaped motion plate.
Structure illustrates:
1, seal flange, is connected with magnet Dewar during experiment;
2, Low-temperature epoxy glue, prevents the helium gasified from leaking along current feed, also has good insulation and sealing function at low temperatures;
3, two bakelite support rings are specimen holder support component;
4, epoxy sheath, a protective current lead-in wire, plays a supporting role simultaneously, in addition for the cold helium of evaporation provides return-air road, puts into specimen holder and laboratory cooling current feed, saves liquid helium;
5, the oxygen-free copper current feed for being connected with sample, current feed xsect is through optimal design, and through-current capability reaches 1000A;
6, lower current lead-in wire, by oxygen-free copper and Nb
3sn superconducting line forms, and plays the effect of transmission current and placement sample;
7, epoxy back up pad, when sample is by electric current, can be subject to Lorentz force action under the influence of a magnetic field, after determining direction of current, epoxy back up pad is pointed in the direction of Lorentz force, and such epoxy back up pad just serves supporting role, prevent sample under the effect of Lorentz force, deviation occurs.In addition, epoxy back up pad also serves the effect of fixing lower current lead-in wire, ensures current feed stability operationally.Circular shaped motion plate in epoxy back up pad is demountable, when the design of this structure is to convert sample angle, avoids sample to be touched in dismounting or bend to the full extent.Protect sample injury-free to the full extent.
Principle of work of the present invention is:
The specimen holder of design want can to superconducting line axis and magnetic field angular range from 0 degree to 180 carry out critical current measurement.
Tested short sample is fixed in specimen holder lower current lead-in wire and epoxy back up pad.Be placed on the neutralization of liquid helium groove to be parallel in the axis magnetic field (solenoid) of specimen holder.The selection of direction of current will make the Ampère force suffered by the short sample of superconducting line be directed to epoxy back up pad side, in order to avoid short sample is subject to excessive Ampère force and produces larger deformation, or comes off from specimen holder, falls in magnet.
Owing to adopting 4 leads method test critical currents, on short sample, voltage signal, therefore Chang Du Yao≤40mm of the short sample of superconducting line must be gathered by the equipotential line of weld interval 20-40mm.
The resolution of magnetic field measurement system is better than 20mT, and its absolute accuracy is better than 1%.
The resolution of testing current must be better than 0.1A, and absolute accuracy is better than 0.5%.
Proving installation comprises the magnet system providing ambient field, specimen holder, low-temperature (low temperature) vessel, power-supply device and data acquisition system (DAS) etc.
There is provided the magnet of ambient field to be spiral cast superconduction hybrid magnet, inside and outside coil is respectively by Nb3Sn and NbTi wire-wound system.Aperture is 70mm, and its central magnetic field reaches as high as 16T, center diameter, is highly uniformity of magnetic field in the cylinder of 10mm up to 2.3 × 10
-4.
Magnet is in parallel-individual superconducting switch simultaneously, and during stable magnetic field, magnet is in operation with closed ring pattern, and is immersed in liquid helium, and during to ensure to test, magnet system is more stable.
Beneficial effect of the present invention is:
The present invention has played vital role in the test of Superconducting Strand cryogenic property, and wherein epoxy sheath provides helium circuit, and cooling current feed, saves a large amount of liquid helium; Epoxy sheath inner supporting structure is easy to dry, and the time changing sample is shortened greatly, and the phenomenon of freezing after specimen holder sweating water puts into liquid helium Dewar can not occur; Lower end epoxy back up pad can prevent test sample be energized in background magnetic field and produce distortion by Lorentz force action, and adjust sample and background magnetic field add angle.
Advantage of the present invention is:
The present invention is applicable to Superconducting Strand performance test experiment, and domesticly at present there is no similar structures, this structure is reliable contacts at low temperatures, and can pass into big current, operates simple and easy, can not damage superconducting line when changing sample.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of epoxy back up pad.
Embodiment
As Fig. 1, shown in 2, a kind of straight short sample superconducting line multi-angle field critical current test specimen holder, include two current feeds 5, epoxy sheath 4 is arranged with outside two current feeds 5, one end of epoxy sheath 4 is provided with seal flange 1, bakelite support ring 3 is respectively equipped with in the two ends inwall of epoxy sheath 4, 6, Low-temperature epoxy glue 2 is filled with between the outer wall of the two ends inwall of epoxy sheath 4 and two current feeds 5, two current feeds 5 all stretch out outside epoxy sheath 4, two current feeds 5 not installing one end of seal flange 1 and two lower current go between and 7 to be connected, the other end of two lower current lead-in wires 7 is fixed in epoxy back up pad 8.
Current feed 5 is oxygen-free copper current feed, and lower current lead-in wire 7 is by oxygen-free copper and Nb
3sn superconducting line forms.
Namely one end that one end of epoxy back up pad 8 is movably installed with dismountable circular shaped motion plate 9, two lower current lead-in wires 7 is fixed on described circular shaped motion plate 9.
Claims (3)
1. a straight short sample superconducting line multi-angle field critical current test specimen holder, it is characterized in that: include two current feeds, epoxy sheath is arranged with outside two current feeds, one end of epoxy sheath is provided with seal flange, bakelite support ring is respectively equipped with in the two ends inwall of epoxy sheath, Low-temperature epoxy glue is filled with between the outer wall of the two ends inwall of epoxy sheath and two current feeds, two current feeds all stretch out outside epoxy sheath, two current feeds not installing one end of seal flange go between with two lower current and are connected, the other end of two lower current lead-in wires is fixed in epoxy back up pad.
2. straight short sample superconducting line multi-angle field according to claim 1 critical current test specimen holder, is characterized in that: described current feed is oxygen-free copper current feed, and lower current lead-in wire is by oxygen-free copper and Nb
3sn superconducting line forms.
3. straight short sample superconducting line multi-angle field according to claim 1 critical current test specimen holder, it is characterized in that: one end of described epoxy back up pad is movably installed with dismountable circular shaped motion plate, namely one end of two lower current lead-in wires is fixed on described circular shaped motion plate.
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| CN201510297762.7A CN105004901A (en) | 2015-06-03 | 2015-06-03 | Critical current test sample rod for straight short sample superconducting wire in multi-angle field |
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| CN201510297762.7A CN105004901A (en) | 2015-06-03 | 2015-06-03 | Critical current test sample rod for straight short sample superconducting wire in multi-angle field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872733A (en) * | 2017-01-16 | 2017-06-20 | 中国科学院合肥物质科学研究院 | 2kA superconductive strand critical current test sample holders |
| CN110554214A (en) * | 2018-06-04 | 2019-12-10 | 西部超导材料科技股份有限公司 | Superconducting short sample turning angle critical current measurement sample rod |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799490A (en) * | 2010-03-25 | 2010-08-11 | 中国科学院等离子体物理研究所 | Sample test rod of superconducting line temperature-change measurement system |
| CN201796076U (en) * | 2010-03-10 | 2011-04-13 | 中国科学院等离子体物理研究所 | Superconductive strand critical current test sample holder |
-
2015
- 2015-06-03 CN CN201510297762.7A patent/CN105004901A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201796076U (en) * | 2010-03-10 | 2011-04-13 | 中国科学院等离子体物理研究所 | Superconductive strand critical current test sample holder |
| CN101799490A (en) * | 2010-03-25 | 2010-08-11 | 中国科学院等离子体物理研究所 | Sample test rod of superconducting line temperature-change measurement system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872733A (en) * | 2017-01-16 | 2017-06-20 | 中国科学院合肥物质科学研究院 | 2kA superconductive strand critical current test sample holders |
| CN110554214A (en) * | 2018-06-04 | 2019-12-10 | 西部超导材料科技股份有限公司 | Superconducting short sample turning angle critical current measurement sample rod |
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