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Titolo:
Ac loss and interstrand contact resistance in bare and coated NbTi/Cu Rutherford cables with cores
Autore:
Sumption, MD; Collings, EW; Scanlan, RM; Kim, SW; Wake, M; Shintomi, T; Nijhuis, A; ten Kate, HHJ;
Indirizzi:
Ohio State Univ, Lab Appl Superconduct, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 uperconduct, Columbus, OH 43210 USA Ohio State Univ, Lab Magnetism Mat Sci & Engn, Columbus, OH 43210 USA OhioState Univ Columbus OH USA 43210 Sci & Engn, Columbus, OH 43210 USA Lawrence Berkeley Lab, Superconducting Magnet Grp, Berkeley, CA 94707 USA Lawrence Berkeley Lab Berkeley CA USA 94707 t Grp, Berkeley, CA 94707 USA Natl Lab High Energy Phys, Tsukuba, Ibaraki 305, Japan Natl Lab High Energy Phys Tsukuba Ibaraki Japan 305 a, Ibaraki 305, Japan Univ Twente, Fac Appl Phys, Low Temp Div, NL-7500 AE Enschede, NetherlandsUniv Twente Enschede Netherlands NL-7500 AE 500 AE Enschede, Netherlands
Titolo Testata:
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
fascicolo: 11, volume: 14, anno: 2001,
pagine: 888 - 897
SICI:
0953-2048(200111)14:11<888:ALAICR>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERCONDUCTING DIPOLE MAGNET; LHC-MAIN-MAGNETS; COUPLING LOSSES; STRANDS; NB3SN; STABILITY; FIELDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Sumption, MD Ohio State Univ, Lab Appl Superconduct, 477 Watts Hall,2041 Coll Rd, Columbus, OH 43210 USA Ohio State Univ 477 Watts Hall,2041 Coll Rd Columbus OH USA 43210
Citazione:
M.D. Sumption et al., "Ac loss and interstrand contact resistance in bare and coated NbTi/Cu Rutherford cables with cores", SUPERCOND S, 14(11), 2001, pp. 888-897

Abstract

Ac loss due to coupling currents in a Rutherford cable can be controlled by increasing the interstrand contact resistance through adjusting the levelof native oxidation of the strand, coating it, or by inserting a ribbon-like core into the cable itself. In an investigation of coupling loss, magnetic and calorimetric measurements were performed on: (i) a 'reference pair' of bare and stabrite-coated uncored Rutherford cables; (ii) a series of stabrite-coated cables with cores of titanium, stainless steel, and kapton ribbon; and (iii) a series of bare-Cu cables with fixed overall thickness but with cores of successively increasing thickness. Measurements were made both with and without the release of uniaxial pressure between 'curing' and measurement and, in the former case, after reapplication of in-cryostat ('cold') pressure. The total ac loss was measured as a function of the ramp rateof a magnetic field applied in either the face-on (FO, perpendicular to the cable's broad face) or edge-on (EO) orientations. From the coupling-current loss components, standard formulae enabled the interstrand contact resistances R-perpendicular to (crossover) and R-parallel to (side-by-side) to be determined. These were combined, for the purpose of discussion, into an effective FO-measured contact resistance, R-perpendicular to ,R-eff (R-perpendicular to, R-parallel to). It was noted that under the pressure-release measurement condition: (i) although the inclusion of a core (of any of the three materials) generally brings about a strong suppression of the FO loss,its presence at fixed cable outer dimensions causes an increase in the EO loss presumably as a result of increased side-by-side contact; (ii) increases in the core thickness, again at fixed cable size, resulted in still further increases in the side-by-side contact, and concurrent small reductions in the existing large R-perpendicular to ,R-eff(R-perpendicular to, R-parallel to). Although previously reported results had confirmed that the insertion of a core into a stabrite cable removed the cold-pressure sensitivity of its R-perpendicular to ,R-eff-a highly desirable outcome-it was noted that the cored-enhanced R-perpendicular to ,R-eff s were then much larger thanthe 20 or so mu Omega called for by dipole magnet designers. With a view to correcting this problem a series of cables with reduced-width cores was proposed for future fabrication and measurement.

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Documento generato il 30/09/20 alle ore 09:45:06