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AbstractAbstract
[en] Composite billets that function as starting stock for superconducting wire are produced by immersing an assembly of rods of a superconductor alloy or rods of a metal which is capable of forming a superconductor into a molten bath of normal material, thereby encasing the assembly within normal material, allowing the molten bath to solidify and form a rough as-cast billet and thereafter zone-melting the billet so as to remove all vestiges of shrinkage cracks, surface imperfections and internal inhomogeneities. 9 claims, 3 figures
Original Title
Patent
Primary Subject
Source
23 Sep 1975; 8 p; US PATENT DOCUMENT 3,907,550/A/
Record Type
Patent
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Duchateau, J.L.; Turck, B.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. du Synchrotron Saturne1975
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. du Synchrotron Saturne1975
AbstractAbstract
[en] Superconducting magnets made of high current composites, often show their maximum performances to be limited by the so called degradation. One fundamental reason arises from the fact that if transposition of the filaments in a composite allows complete sharing of the transport current, twisting does not. As a result, the filaments behave collectively and the overall self field can give rise to a catastrophic flux jump. The question is: are the usual multifilamentary composites stable. If not, what current can be carried without instability problems. Reciprocally what composite is to be chosen in typical magnets to carry a given current. Expressions and curves act as very useful basis for determination of quenching currents in coils under various cooling
[fr]
Les performances maximales des aimants supraconducteurs, faits de composites pour courants forts, sont souvent limitees par la degradation. Une raison fondamentale est que si l'arrangement des filaments dans un composite permet le partage du courant de transport, ils ne doivent pas etre enroules. Le resultat est que les filaments se comportent collectivement et le champ propre total peut donner naissance a un saut du flux catastrophique. La question est: est-ce que les composites usuels a multifilaments sont stables. Si non, quel courant peut etre transporte sans probleme d'instabilite. Reciproquement, quel composite doit etre choisi dans les aimants typiques pour transporter un courant donne. Les expressions et les courbes sont des bases tres utiles pour la determination des courants de rupture dans les bobines sous refroidissements variesPrimary Subject
Source
21 Apr 1975; 5 p; 5. International conference on magnet technology; Frascati, Italy; 21 Apr 1975
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
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Nowik, I.; Felner, I.; Bauminger, E.R.
Second international Israeli conference on High Tc Superconductivity1993
Second international Israeli conference on High Tc Superconductivity1993
AbstractAbstract
[en] Short communication
Source
Ministry of Science and Technology, Jerusalem (Israel); 221 p; Jan 1993; p. 85; 2. international Israeli conference on High Tc Superconductivity; Eilat (Israel); 4-7 Jan 1993
Record Type
Miscellaneous
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Juengst, K.P.; Ries, G.
Gesellschaft fuer Kernforschung m.b.H., Karlsruhe (Germany, F.R.)1977
Gesellschaft fuer Kernforschung m.b.H., Karlsruhe (Germany, F.R.)1977
AbstractAbstract
[en] The invention concerns a superconductor consisting of a number of superconducting filaments which are embedded in normally conducting material like, e.g., copper. In order to suppress coupling effects between th filaments in alternating magnetic fields, the filaments are snaked on circles with different radii around the longitudinal axis of the superconductor, each filament forming a helix concentrical with the conductor axis. If, on the other hand, the alternating magnetic field has a longitudinal component, two coils of different diameter are screening one another, which will cause magnetic instabilities and considerable alternating field losses. In order to prevent this, the filaments according to the invention are alternatingly snaked in opposite sense of rotation, each of the helices formed by the filaments describing a predetermined number of complete turns around the conductor axis in a linear segment corresponding to the alternating length. (FW)
[de]
Die Erfindung betrifft einen Supraleiter, der aus einer Vielzahl supraleitender Filamente besteht, die in normalleitendes Material wie etwa Kupfer eingebettet sind. Um in magnetischen Wechselfeldern Koppeleffekte zwischen den Filamenten zu unterdruecken, sind diese auf Kreisen unterschiedlicher Radien um die Laengsachse des Supraleiters verdrillt, wobei jedes Filament eine zur Leiterachse konzentrische Schraubenlinie bildet. Besitzt jedoch das magnetische Wechselfeld eine longitudinale Komponente, so schirmen sich zwei Spulen unterschiedlichen Durchmessers gegenseitig ab, was zu magnetischen Instabilitaeten und erheblichen Wechselfeldverlusten fuehrt. Um dies zu verhindern, werden erfindungsgemaess die Filamente abwechselnd in entgegengesetztem Drehsinn verdrillt, wobei jede der von den Filamenten gebildeten Schraubenlinien in einem der Alternierungslaenge entsprechenden Laengenabschnitt eine vorbestimmte Anzahl vollstaendiger Drehungen um die Leiterachse beschreibt. (FW)Original Title
Supraleiter
Primary Subject
Source
28 Apr 1977; 4 p; DE PATENT DOCUMENT 2517924/B/; Also available from Dt. Patentamt, Muenchen (FRG); 1 fig.
Record Type
Patent
Country of publication
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INIS IssueINIS Issue
AbstractAbstract
[en] Short communication
Primary Subject
Source
Ministry of Science and Technology, Jerusalem (Israel); 221 p; Jan 1993; p. 91; 2. international Israeli conference on High Tc Superconductivity; Eilat (Israel); 4-7 Jan 1993
Record Type
Miscellaneous
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AbstractAbstract
[en] This study, 85K phase superconductive thin films in a B(2-x)PbxSr2Ca2Cu3O(10+y) bismuth-copper-oxide system are obtained by synchronized deposition of Bi, Cu, CaF2, SrFZ compounds on Mg0 (t00) single crystal substrates annealed in 600-B40 0 C temperature range. The films are annealed in H20+Oz atmosphere for the removal of F (flouride) from the structure. Resistance-temperature measurements of the samples are analyzed via the d.c. method in the range of 77 K - 300 K. X-ray powder diffraction studies revealed which phases occured in the structure. No single-phase B5 K superconductivity is observed. The films are observed to grow along the c-axis due to reflections on the (OOQ (/=2, 4, 6... ) planes. Although various annealing conditions applied, the critical temperatures of the prepared films were not attamed above the liquid nitrogen temperature in the case of single-source evaporation. The critical temperatures, however, are obtained at higher levels when Bi metals is used as bismuth source and evaporated in a different boat. In addition, an improvement in the metallic behavior is observed
Original Title
Es zamanli buharlasma ile elde edilen Bi(2-x)PbxSr2Ca2Cu3O(10+y) ustuniletken ince filmlerin yapisal ve elektriksel ozellikleri
Primary Subject
Source
1996; 60 p; ISBN 975-491-046-4;
; Available from Hacettepe Univ., Fen Bilimleri Enstitusu, Ankara (TR); Thesis (Ms)

Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
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AbstractAbstract
[en] Short communication
Source
Ministry of Science and Technology, Jerusalem (Israel); 221 p; Jan 1993; p. 78; 2. international Israeli conference on High Tc Superconductivity; Eilat (Israel); 4-7 Jan 1993
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Miscellaneous
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AbstractAbstract
No abstract available
Source
Israel Physical Society, Jerusalem; Bull. Isr. Phys. Soc; v. 25; p. 35-36; 1979; p. 35-36; Israel Physical Society 1979 annual meeting; Beer-Sheva, Israel; 1 Apr 1979; ISSN 0374-2687;
; Published in summary form only.

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AbstractAbstract
[en] We summarize progress in the development and application of metamaterial structures utilizing superconducting elements. After a brief review of the salient features of superconductivity, the advantages of superconducting metamaterials over their normal metal counterparts are discussed. We then present the unique electromagnetic properties of superconductors and discuss their use in both proposed and demonstrated metamaterial structures. Finally we discuss novel applications enabled by superconducting metamaterials, and then mention a few possible directions for future research. (review article)
Primary Subject
Source
S2040-8978(11)22898-2; Available from http://dx.doi.org/10.1088/2040-8978/13/2/024001; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of Optics (Online); ISSN 2040-8986;
; v. 13(2); [10 p.]

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Reference NumberReference Number
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AbstractAbstract
[en] Short communication
Primary Subject
Source
Ministry of Science and Technology, Jerusalem (Israel); 221 p; Jan 1993; p. 95; 2. international Israeli conference on High Tc Superconductivity; Eilat (Israel); 4-7 Jan 1993
Record Type
Miscellaneous
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