NDLI: Transverse Thermal Conductivity in an Epoxy Impregnated <formula formulatype=inline><tex Notation=TeX>${rm MgB}

Content Provider	IEEE Xplore Digital Library
Author	Hiltunen, I. Jarvela, J. Lehtonen, J. Mikkonen, R. Stenvall, A. Viljamaa, J.
Copyright Year	2002
Abstract	Superconducting magnets operate at low temperatures, and therefore, even small heat pulses can ruin their stable operation. For example, resistive joints or changes in the operation current generate heat which must be extracted to prevent a quench. In impregnated magnets, the transverse thermal conductivity inside the coil has a vital influence on the heat extraction, and it dominates the 3D quench propagation. In this study, the transverse heat conductivity is measured from the cross-section of a small epoxy impregnated MgB₂ coil at temperatures between 10 and 35 K. Finally, the results are analysed and compared with the results of a computational model based on heat conduction equation solved with the finite element method. The results show that effective thermal conductivity is over two orders of magnitude higher in the parallel direction with conductor axis compared to the perpendicular direction. The measured effective thermal conductivities at 20 K parallel to the broad tape face and perpendicular to the broad tape face were 1.55 W/mK and 0.31 W/mK, respectively. The fill factor of the measured coil was 60.5% for the whole conductor.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2407
Ending Page	2410
Page Count	4
File Size	463279
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermal conductivity Temperature Conductivity measurement Conductors Superconducting magnets Thermal quenching Superconducting coils Computational modeling Equations Finite element methods thermal conductance Heat propagation MgB2 stability
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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