K. Watanabe, G. Nishijima, S. Awaji, Y. Hikichi, T. Hasegawa
Practical multifilamentary Ag/Bi2Sr2CaCu2O8 round wires 1 mm in diameter exhibit critical current properties without anisotropy in fields up to 30 T and 4.2 K. We concentrate on the development of a Ag/Bi2Sr2CaCu2O8 insert coil by a wind‐and‐react method for a high field NMR superconducting magnet. Hastelloy cloth was used for the insulation for the wind‐and‐react process. A φ0.05 mm Hastelloy X (Hx) filament was knitted into a braid tube, and has a high mechanical strength and a good tolerance to oxidization at high temperature. We fabricated multifilamentary Ag/Bi2Sr2CaCu2O8 wires with Hx cloth, and heat‐treated them at around 890 °C in an oxygen atmosphere. It was found that the surface of Hx cloth is oxidized enough for a good electric insulation. Multifilamentary Ag/Bi2Sr2CaCu2O8 wires with oxidized Hx cloth insulation have the critical current of 720 A at 4.2 K in a self field.
{"title":"Oxidized Hastelloy Cloth Insulation for a Wind‐and‐React Processed Ag/Bi2Sr2CaCu2O8 Superconducting Magnet","authors":"K. Watanabe, G. Nishijima, S. Awaji, Y. Hikichi, T. Hasegawa","doi":"10.1063/1.2192413","DOIUrl":"https://doi.org/10.1063/1.2192413","url":null,"abstract":"Practical multifilamentary Ag/Bi2Sr2CaCu2O8 round wires 1 mm in diameter exhibit critical current properties without anisotropy in fields up to 30 T and 4.2 K. We concentrate on the development of a Ag/Bi2Sr2CaCu2O8 insert coil by a wind‐and‐react method for a high field NMR superconducting magnet. Hastelloy cloth was used for the insulation for the wind‐and‐react process. A φ0.05 mm Hastelloy X (Hx) filament was knitted into a braid tube, and has a high mechanical strength and a good tolerance to oxidization at high temperature. We fabricated multifilamentary Ag/Bi2Sr2CaCu2O8 wires with Hx cloth, and heat‐treated them at around 890 °C in an oxygen atmosphere. It was found that the surface of Hx cloth is oxidized enough for a good electric insulation. Multifilamentary Ag/Bi2Sr2CaCu2O8 wires with oxidized Hx cloth insulation have the critical current of 720 A at 4.2 K in a self field.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"704-709"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192413","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59399559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Gregory, B. Zeitlin, M. Tomsic, X. Wu, X. Peng, M. Sumption, E. Collings
In the past much of the emphasis in the development of Nb3Sn superconductors for High Energy Physics has been on improving the non‐Cu critical current density, (Jc), at 12 T. More recently the focus has shifted to improving the matrix residual resistivity ratio, (RRR), and decreasing the ac losses. In addition, the field of interest has risen to the 15–18 T range. Piece length and cost are also factors that are assumed not to deteriorate as the other properties are improved. In this paper we have emphasized reduction of losses by changing the conductor design. This has been explored both by the introduction of fins of various types and also by simply increasing the number of subelements using a tubular process, which has the potential of a low cost approach. The effect of these changes on the ease with which the multi‐subelementary material can be made is explored and discussed.
{"title":"Various Methods of Reducing AC Losses and Improving Stability of Internal‐Tin Nb3Sn Superconductors","authors":"E. Gregory, B. Zeitlin, M. Tomsic, X. Wu, X. Peng, M. Sumption, E. Collings","doi":"10.1063/1.2192432","DOIUrl":"https://doi.org/10.1063/1.2192432","url":null,"abstract":"In the past much of the emphasis in the development of Nb3Sn superconductors for High Energy Physics has been on improving the non‐Cu critical current density, (Jc), at 12 T. More recently the focus has shifted to improving the matrix residual resistivity ratio, (RRR), and decreasing the ac losses. In addition, the field of interest has risen to the 15–18 T range. Piece length and cost are also factors that are assumed not to deteriorate as the other properties are improved. In this paper we have emphasized reduction of losses by changing the conductor design. This has been explored both by the introduction of fins of various types and also by simply increasing the number of subelements using a tubular process, which has the potential of a low cost approach. The effect of these changes on the ease with which the multi‐subelementary material can be made is explored and discussed.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"843-850"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192432","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59399687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The reactive liquid Mg infiltration of Boron powders preforms is an easy technique to obtain high density and large superconducting bulk MgB2 manufacts, in which the supercurrents can percolate without obstacles by grains boundaries. The microstructure of these manufacts, as well their superconducting characteristics, can be tailored according to the Boron powders used and the particular arrangements of the reactants in a stainless steel container. A discussion of the superconducting characteristics of prototype manufacts of various shape will be given. The practical application of these manufacts, as permanent magnets for bearings or as current leads, will be discussed with reference to other superconducting bulk options. The expected temperature range for the use of this material will be between 15K and 30K and that calls for the development of reliable and cheap cryogenic systems.
{"title":"The Superconducting Properties of High Density Bulk MgB2 Obtained by Reactive Liquid Mg Infiltration","authors":"G. Giunchi","doi":"10.1063/1.2192428","DOIUrl":"https://doi.org/10.1063/1.2192428","url":null,"abstract":"The reactive liquid Mg infiltration of Boron powders preforms is an easy technique to obtain high density and large superconducting bulk MgB2 manufacts, in which the supercurrents can percolate without obstacles by grains boundaries. The microstructure of these manufacts, as well their superconducting characteristics, can be tailored according to the Boron powders used and the particular arrangements of the reactants in a stainless steel container. A discussion of the superconducting characteristics of prototype manufacts of various shape will be given. The practical application of these manufacts, as permanent magnets for bearings or as current leads, will be discussed with reference to other superconducting bulk options. The expected temperature range for the use of this material will be between 15K and 30K and that calls for the development of reliable and cheap cryogenic systems.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"813-819"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192428","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59399708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Poly‐diCylopentadiene (poly‐DCPD) resins are widely used because of their excellent physical and mechanical properties and their compatibility with various molding techniques. Poly‐DCPD’s ability to be rotationally molded has generated the potential for this crosslinked thermoset polymer to be used for cryogenic tanks. In turn, this has generated the need for cryogenic materials property data on these resins. In a collaborative research agreement between the National High Magnetic Field Laboratory (NHMFL) and Cymetech LLC, five different variations of poly‐DCPD have been thermally and mechanically characterized. Specifically, the tensile, compressive, shear and flexural properties have been measured at 77 K, as well as thermal contraction to 77 and 4 K. There are subtle differences in the properties between each formulation and larger discrepancies when compared to cryogenic data for other polymers. The thermal contraction to 77 K and elastic modulus are typical compared to other epoxies and polyester while the 77 K strength and elongation to failure are superior. The high strengths and elongations are good indicators that poly‐DCPD also has good toughness — an important property in many low temperature applications. This initial cryogenic properties database for poly‐DCPD allows it to be considered as a neat polymer in cryogenic applications, as well as an excellent matrix material for fiber reinforced composites in cryogenic applications.Poly‐diCylopentadiene (poly‐DCPD) resins are widely used because of their excellent physical and mechanical properties and their compatibility with various molding techniques. Poly‐DCPD’s ability to be rotationally molded has generated the potential for this crosslinked thermoset polymer to be used for cryogenic tanks. In turn, this has generated the need for cryogenic materials property data on these resins. In a collaborative research agreement between the National High Magnetic Field Laboratory (NHMFL) and Cymetech LLC, five different variations of poly‐DCPD have been thermally and mechanically characterized. Specifically, the tensile, compressive, shear and flexural properties have been measured at 77 K, as well as thermal contraction to 77 and 4 K. There are subtle differences in the properties between each formulation and larger discrepancies when compared to cryogenic data for other polymers. The thermal contraction to 77 K and elastic modulus are typical compared to other epoxies and polyester whi...
{"title":"Thermal and Mechanical Properties of Poly‐Dicyclopentadiene (DCPD) at Cryogenic Temperatures","authors":"V. Toplosky, R. Walsh","doi":"10.1063/1.2192354","DOIUrl":"https://doi.org/10.1063/1.2192354","url":null,"abstract":"Poly‐diCylopentadiene (poly‐DCPD) resins are widely used because of their excellent physical and mechanical properties and their compatibility with various molding techniques. Poly‐DCPD’s ability to be rotationally molded has generated the potential for this crosslinked thermoset polymer to be used for cryogenic tanks. In turn, this has generated the need for cryogenic materials property data on these resins. In a collaborative research agreement between the National High Magnetic Field Laboratory (NHMFL) and Cymetech LLC, five different variations of poly‐DCPD have been thermally and mechanically characterized. Specifically, the tensile, compressive, shear and flexural properties have been measured at 77 K, as well as thermal contraction to 77 and 4 K. There are subtle differences in the properties between each formulation and larger discrepancies when compared to cryogenic data for other polymers. The thermal contraction to 77 K and elastic modulus are typical compared to other epoxies and polyester while the 77 K strength and elongation to failure are superior. The high strengths and elongations are good indicators that poly‐DCPD also has good toughness — an important property in many low temperature applications. This initial cryogenic properties database for poly‐DCPD allows it to be considered as a neat polymer in cryogenic applications, as well as an excellent matrix material for fiber reinforced composites in cryogenic applications.Poly‐diCylopentadiene (poly‐DCPD) resins are widely used because of their excellent physical and mechanical properties and their compatibility with various molding techniques. Poly‐DCPD’s ability to be rotationally molded has generated the potential for this crosslinked thermoset polymer to be used for cryogenic tanks. In turn, this has generated the need for cryogenic materials property data on these resins. In a collaborative research agreement between the National High Magnetic Field Laboratory (NHMFL) and Cymetech LLC, five different variations of poly‐DCPD have been thermally and mechanically characterized. Specifically, the tensile, compressive, shear and flexural properties have been measured at 77 K, as well as thermal contraction to 77 and 4 K. There are subtle differences in the properties between each formulation and larger discrepancies when compared to cryogenic data for other polymers. The thermal contraction to 77 K and elastic modulus are typical compared to other epoxies and polyester whi...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"219-224"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192354","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Humer, E. Seidl, H. Weber, P. Fabian, S. Feucht, N. Munshi
Glass‐fiber reinforced plastics (GFRPs) are used as insulation materials for the superconducting magnet coils of the International Thermonuclear Experimental Reactor (ITER). The radiation environment present at the magnet location will lead to gas production, swelling and weight loss of the laminate, which may result in a pressure rise combined with undefined stresses on the magnet coil casing. Consequently, these effects are important parameters for the engineering and design criteria of superconducting magnet coil structures. In this study, newly developed epoxy and cyanate‐ester (CE) based S2‐glass fiber reinforced insulation systems were irradiated at ambient temperature in the TRIGA‐Mark II reactor (Vienna) to a fast neutron fluence of 1 and 5×1021 m−2 (E>0.1 MeV) prior to measurements of gas evolution, swelling and weight loss. The CE based laminates show increased radiation resistance, i.e. less gas evolution. The highest radiation hardness up to the highest dose was observed in a pure CE system. I...
{"title":"Gas Evolution Measurements on Reactor Irradiated Advanced Fusion Magnet Insulation Systems","authors":"K. Humer, E. Seidl, H. Weber, P. Fabian, S. Feucht, N. Munshi","doi":"10.1063/1.2192369","DOIUrl":"https://doi.org/10.1063/1.2192369","url":null,"abstract":"Glass‐fiber reinforced plastics (GFRPs) are used as insulation materials for the superconducting magnet coils of the International Thermonuclear Experimental Reactor (ITER). The radiation environment present at the magnet location will lead to gas production, swelling and weight loss of the laminate, which may result in a pressure rise combined with undefined stresses on the magnet coil casing. Consequently, these effects are important parameters for the engineering and design criteria of superconducting magnet coil structures. In this study, newly developed epoxy and cyanate‐ester (CE) based S2‐glass fiber reinforced insulation systems were irradiated at ambient temperature in the TRIGA‐Mark II reactor (Vienna) to a fast neutron fluence of 1 and 5×1021 m−2 (E>0.1 MeV) prior to measurements of gas evolution, swelling and weight loss. The CE based laminates show increased radiation resistance, i.e. less gas evolution. The highest radiation hardness up to the highest dose was observed in a pure CE system. I...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"6 1","pages":"335-341"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. Tang, Xiuyan Li, Enhou Han, Yong-bo Xu, Yiyi Li
The influence of temperature on the deformation and failure behavior of AZ80 wrought Mg alloy has been examined from 77K to 298K. It is found that the yield strength (YS) and ultimate strength (UTS) are increasing with the temperature decreasing, while the elongation is decreasing especial between 213K and 143K. Based on the mechanical tests, observation of environmental scanning electron microscope (ESEM) and transmission electron microscope (TEM), it is proposed that the alloy deforms mainly by slips and twins, but undergoes different mechanism of cleavage in the range of testing temperature. At T>213K, the alloy ductility is higher because the dislocations could pass through twins but pile up at precipitate phase: Mg17Al12, which causes the crack nucleate. At T<143K, the alloy ductility is lower because the dislocation slip are suppressed greatly and dislocations pile up at twins, and cause crack nucleate and expand along twins quickly. At 143K
在77K ~ 298K范围内，研究了温度对AZ80变形镁合金变形和失效行为的影响。结果表明，随着温度的降低，合金的屈服强度(YS)和极限强度(UTS)逐渐升高，而伸长率则逐渐降低，在213K ~ 143K之间表现得尤为明显。通过力学试验、环境扫描电镜(ESEM)和透射电镜(TEM)观察，认为合金变形主要以滑移和孪晶变形为主，但在试验温度范围内发生不同的解理机制。在tbbb213k时，由于位错可以穿过孪晶，但在Mg17Al12析出相堆积，导致裂纹形核，合金的塑性较高。在T<143K时，由于位错滑移受到极大抑制，位错在孪晶处堆积，导致裂纹迅速形核并沿孪晶扩展，合金塑性较低。在143 k
{"title":"Deformation Behavior of AZ80 Wrought Magnesium Alloy at Cryogenic Temperatures","authors":"W. Tang, Xiuyan Li, Enhou Han, Yong-bo Xu, Yiyi Li","doi":"10.1063/1.2192349","DOIUrl":"https://doi.org/10.1063/1.2192349","url":null,"abstract":"The influence of temperature on the deformation and failure behavior of AZ80 wrought Mg alloy has been examined from 77K to 298K. It is found that the yield strength (YS) and ultimate strength (UTS) are increasing with the temperature decreasing, while the elongation is decreasing especial between 213K and 143K. Based on the mechanical tests, observation of environmental scanning electron microscope (ESEM) and transmission electron microscope (TEM), it is proposed that the alloy deforms mainly by slips and twins, but undergoes different mechanism of cleavage in the range of testing temperature. At T>213K, the alloy ductility is higher because the dislocations could pass through twins but pile up at precipitate phase: Mg17Al12, which causes the crack nucleate. At T<143K, the alloy ductility is lower because the dislocation slip are suppressed greatly and dislocations pile up at twins, and cause crack nucleate and expand along twins quickly. At 143K","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"176-183"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192349","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The jacket of the central solenoid (CS) for ITER is designed to support cyclic tension load generated by the electro‐magnetic hoop force during operation. Therefore, the CS jacket material requires high tensile strength, high ductility, and high resistance to fatigue. JK2LB was developed in Japan as a candidate material for CS jacket by using low carbon and boron additions in JK2. The preliminary data of mechanical property for JK2LB without cold work has shown improvement of ductility in comparison to JK2. As a routine multi‐party verification process, a series of new mechanical tests including tensile, fatigue crack growth and fracture toughness have been carried out at 4K in MIT for both the base metal and welds of JK2LB. The test materials provided by JAREI were subjected to various cold work and aging before testing. It is found that the cold work has significant impact on the properties. Large variation of the tensile properties is observed. It includes a few specimens with brittle‐like behavior. Th...
{"title":"Mechanical Properties of JK2LB at 4K","authors":"Jun Feng, J. Kim, R. Ballinger, J. Minervini","doi":"10.1063/1.2192351","DOIUrl":"https://doi.org/10.1063/1.2192351","url":null,"abstract":"The jacket of the central solenoid (CS) for ITER is designed to support cyclic tension load generated by the electro‐magnetic hoop force during operation. Therefore, the CS jacket material requires high tensile strength, high ductility, and high resistance to fatigue. JK2LB was developed in Japan as a candidate material for CS jacket by using low carbon and boron additions in JK2. The preliminary data of mechanical property for JK2LB without cold work has shown improvement of ductility in comparison to JK2. As a routine multi‐party verification process, a series of new mechanical tests including tensile, fatigue crack growth and fracture toughness have been carried out at 4K in MIT for both the base metal and welds of JK2LB. The test materials provided by JAREI were subjected to various cold work and aging before testing. It is found that the cold work has significant impact on the properties. Large variation of the tensile properties is observed. It includes a few specimens with brittle‐like behavior. Th...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"192-199"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192351","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Tanaka, H. Kitaguchi, H. Kumakura, H. Yamada, M. Hirakawa, M. Okada
This paper reports on the fabrication and testing of a MgB2 coil made using a wind & react method. We made a 130m‐long Fe/Cu‐composite sheathed, SiC‐doped MgB2‐superconducting round wire using an in‐situ PIT method. Using a 92m‐long wire, we fabricated a solenoid coil with 722 turns. In the coil test, we measured the Ic of the coil under various external fields and temperatures. The Ic of the coil reached 162 A (Je = 340 A/mm2) at 4.2 K and in the external field of 2 T. The coil generated 2.2 T (the center magnetic field, Bo); thus the total field reached 4.2 T. The Je exceeded 100 A/mm2 in the external fields of 4 T, 2.5 T, and 1 T at 15 K, 20 K, and 25 K, respectively. The Jc of the coil was almost equal to that of the short sample. This indicates that the 92m‐long wire has a very homogeneous Jc distribution.
{"title":"Development of 2T‐Class MgB2 Solenoid Coil","authors":"K. Tanaka, H. Kitaguchi, H. Kumakura, H. Yamada, M. Hirakawa, M. Okada","doi":"10.1063/1.2192408","DOIUrl":"https://doi.org/10.1063/1.2192408","url":null,"abstract":"This paper reports on the fabrication and testing of a MgB2 coil made using a wind & react method. We made a 130m‐long Fe/Cu‐composite sheathed, SiC‐doped MgB2‐superconducting round wire using an in‐situ PIT method. Using a 92m‐long wire, we fabricated a solenoid coil with 722 turns. In the coil test, we measured the Ic of the coil under various external fields and temperatures. The Ic of the coil reached 162 A (Je = 340 A/mm2) at 4.2 K and in the external field of 2 T. The coil generated 2.2 T (the center magnetic field, Bo); thus the total field reached 4.2 T. The Je exceeded 100 A/mm2 in the external fields of 4 T, 2.5 T, and 1 T at 15 K, 20 K, and 25 K, respectively. The Jc of the coil was almost equal to that of the short sample. This indicates that the 92m‐long wire has a very homogeneous Jc distribution.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"662-669"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192408","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59398779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Sumption, A. Contractor, S. Kawabata, E. Collings
AC loss measurements have been made on YBCO coated conductors in externally applied sinusoidal AC fields using the pick‐up coil method. Various arrangements of YBCO coated conductor have been measured at frequencies of 50 Hz, 75 Hz, 100 Hz, 150 Hz, and 200 Hz, with amplitudes ranging from 0 to 140 mT. Three different sets of IBAD‐based YBCO coated conductor were measured: (i) unfilamented conductors with Cu added either on one side only, or on both sides (as well as the edges), (ii) conductors with various numbers of filament, (iii) 4 mm wide conductors. All samples were 4 cm long and untwisted. The per cycle AC loss per unit length of conductor, displayed in the format Q/B (in J/T.m) vs. Bm. enabled separation of the eddy current and hysteretic components of the total loss, after which the results were analyzed and discussed. The resistivity of the interfilamentary connections were characterized and the results compared to expectation.
在外部正弦交流磁场中，用检波线圈法测量了YBCO涂层导体的交流损耗。在50hz, 75hz, 100hz, 150hz和200hz的频率范围内，测量了不同排列的YBCO涂层导体，幅度从0到140 mT。测量了三种不同的IBAD基YBCO涂层导体:(i)仅在一侧或两侧(以及边缘)添加Cu的无丝导体，(ii)具有不同数量的丝的导体，(iii) 4mm宽的导体。所有的样品都是4厘米长，没有扭曲。单位长度导体的每周期交流损耗，以Q/B (J/T.m) vs. Bm的格式显示。使总损耗的涡流和滞后分量分离，然后对结果进行分析和讨论。对纤维间连接的电阻率进行了表征，并与预期结果进行了比较。
{"title":"AC loss (50-200 Hz) in YBCO conductors with filaments and Cu stabilization","authors":"M. Sumption, A. Contractor, S. Kawabata, E. Collings","doi":"10.1063/1.2192437","DOIUrl":"https://doi.org/10.1063/1.2192437","url":null,"abstract":"AC loss measurements have been made on YBCO coated conductors in externally applied sinusoidal AC fields using the pick‐up coil method. Various arrangements of YBCO coated conductor have been measured at frequencies of 50 Hz, 75 Hz, 100 Hz, 150 Hz, and 200 Hz, with amplitudes ranging from 0 to 140 mT. Three different sets of IBAD‐based YBCO coated conductor were measured: (i) unfilamented conductors with Cu added either on one side only, or on both sides (as well as the edges), (ii) conductors with various numbers of filament, (iii) 4 mm wide conductors. All samples were 4 cm long and untwisted. The per cycle AC loss per unit length of conductor, displayed in the format Q/B (in J/T.m) vs. Bm. enabled separation of the eddy current and hysteretic components of the total loss, after which the results were analyzed and discussed. The resistivity of the interfilamentary connections were characterized and the results compared to expectation.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"28 1","pages":"885-892"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192437","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59400109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Since the introduction of the cable‐in‐conduit conductor (CICC) concept, a variety of alloys have been proposed for fabricating the jacket. The jacket provides primary containment of the liquid helium coolant and is typically also the primary structural component for the magnet coils. These functions create requirements for strength, toughness, fatigue crack resistance, and fabricability. When the CICC uses Nb3Sn superconductor, the conduit alloy must retain good mechanical properties after exposure to the superconductor’s reaction heat treatment. Here we present data from cryogenic fracture toughness and fatigue crack growth rate tests on 316LN and a Cr‐Mo‐Ni base super‐alloy (Haynes 242) at 4 K before and after the exposure to the heat treatment. These alloys are presently being considered as candidates for use in the next‐generation series connected hybrid magnet for the NHMFL. Both of the alloys are found to have adequate fatigue and fracture properties for the CICC application while the superalloy ha...
自引入电缆-导管导体(CICC)概念以来，已经提出了各种合金来制造护套。护套提供液氦冷却剂的主要容器，通常也是磁铁线圈的主要结构部件。这些功能产生了对强度、韧性、抗疲劳裂纹和可制造性的要求。采用Nb3Sn超导体时，管道合金经超导体反应热处理后，必须保持良好的力学性能。在这里，我们给出了316LN和Cr - Mo - Ni基超级合金(Haynes 242)在4 K热处理前后的低温断裂韧性和疲劳裂纹扩展速率测试数据。这些合金目前被认为是下一代串联混合磁体用于NHMFL的候选人。两种合金都具有足够的抗疲劳和断裂性能，而高温合金则具有较好的抗疲劳和断裂性能。
{"title":"Effect of an Aging Heat Treatment on the 4 K Fracture and Fatigue Properties of 316LN and Haynes 242","authors":"R. Walsh, V. Toplosky, Ke Han, J. Miller","doi":"10.1063/1.2192340","DOIUrl":"https://doi.org/10.1063/1.2192340","url":null,"abstract":"Since the introduction of the cable‐in‐conduit conductor (CICC) concept, a variety of alloys have been proposed for fabricating the jacket. The jacket provides primary containment of the liquid helium coolant and is typically also the primary structural component for the magnet coils. These functions create requirements for strength, toughness, fatigue crack resistance, and fabricability. When the CICC uses Nb3Sn superconductor, the conduit alloy must retain good mechanical properties after exposure to the superconductor’s reaction heat treatment. Here we present data from cryogenic fracture toughness and fatigue crack growth rate tests on 316LN and a Cr‐Mo‐Ni base super‐alloy (Haynes 242) at 4 K before and after the exposure to the heat treatment. These alloys are presently being considered as candidates for use in the next‐generation series connected hybrid magnet for the NHMFL. Both of the alloys are found to have adequate fatigue and fracture properties for the CICC application while the superalloy ha...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"107-114"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192340","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59395982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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