Interchange of current between shunt layer and HTS film in long coated tapes
In long-length HTS coated metallic tapes a shunt layer is required to subdue the influence of the hot spots as well as to equalize the potential between the HTS film and the metallic tape in the case when the transport current is near to its critical value. Both a modelling and measurements of curre...
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| Veröffentlicht in: | Physica. C, Superconductivity Superconductivity, 2002-08, Vol.372, p.857-862 |
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| container_title | Physica. C, Superconductivity |
| container_volume | 372 |
| creator | Usoskin, A. Issaev, A. Freyhardt, H.C. Leghissa, M. Oomen, M.P. Neumueller, H.-W. |
| description | In long-length HTS coated metallic tapes a shunt layer is required to subdue the influence of the hot spots as well as to equalize the potential between the HTS film and the metallic tape in the case when the transport current is near to its critical value. Both a modelling and measurements of current transfer between current contact, shunt layer and HTS film have been performed to optimize the architecture of the coated tapes. The model of current interchange allows to determine analytically the total power losses as well as the surface density of the power losses at the contact areas. Expressions derived for power dissipation lead to a criterion for the contact resistance,
R
s, and the length of the current contact,
L, of the given HTS/shunt/contact architecture. For a combination of YBCO and Au layers, for example, the
R
s must be |
| doi_str_mv | 10.1016/S0921-4534(02)00872-9 |
| format | Article |
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R
s, and the length of the current contact,
L, of the given HTS/shunt/contact architecture. For a combination of YBCO and Au layers, for example, the
R
s must be <10
−5
Ω
cm
2 to ensure a relevant suppression of Joule's heat in these areas. A finite element model employed for the verification of calculated dependences yields additional peaks of power density at the edge of the current contact. The location of the peaks agrees with experimental observations. Experimental studies yield a threshold of 1 W/cm
2 for the power density, which would cause damage of the coated conductor. Tapes with lengths up to 2 m and critical currents up to 145 A per centimeter width (at 77 K, 0 T) were manufactured and tested in order to optimize parameters of the current contacts and shunt layer.</description><identifier>ISSN: 0921-4534</identifier><identifier>EISSN: 1873-2143</identifier><identifier>DOI: 10.1016/S0921-4534(02)00872-9</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Cables ; Coated conductors ; High temperature superconductivity</subject><ispartof>Physica. C, Superconductivity, 2002-08, Vol.372, p.857-862</ispartof><rights>2002 Elsevier Science B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c369t-59382af68136e509cc6d7b221eb73c338865369fb16ec740f7c8f5ea5a948db43</citedby><cites>FETCH-LOGICAL-c369t-59382af68136e509cc6d7b221eb73c338865369fb16ec740f7c8f5ea5a948db43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0921-4534(02)00872-9$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Usoskin, A.</creatorcontrib><creatorcontrib>Issaev, A.</creatorcontrib><creatorcontrib>Freyhardt, H.C.</creatorcontrib><creatorcontrib>Leghissa, M.</creatorcontrib><creatorcontrib>Oomen, M.P.</creatorcontrib><creatorcontrib>Neumueller, H.-W.</creatorcontrib><title>Interchange of current between shunt layer and HTS film in long coated tapes</title><title>Physica. C, Superconductivity</title><description>In long-length HTS coated metallic tapes a shunt layer is required to subdue the influence of the hot spots as well as to equalize the potential between the HTS film and the metallic tape in the case when the transport current is near to its critical value. Both a modelling and measurements of current transfer between current contact, shunt layer and HTS film have been performed to optimize the architecture of the coated tapes. The model of current interchange allows to determine analytically the total power losses as well as the surface density of the power losses at the contact areas. Expressions derived for power dissipation lead to a criterion for the contact resistance,
R
s, and the length of the current contact,
L, of the given HTS/shunt/contact architecture. For a combination of YBCO and Au layers, for example, the
R
s must be <10
−5
Ω
cm
2 to ensure a relevant suppression of Joule's heat in these areas. A finite element model employed for the verification of calculated dependences yields additional peaks of power density at the edge of the current contact. The location of the peaks agrees with experimental observations. Experimental studies yield a threshold of 1 W/cm
2 for the power density, which would cause damage of the coated conductor. Tapes with lengths up to 2 m and critical currents up to 145 A per centimeter width (at 77 K, 0 T) were manufactured and tested in order to optimize parameters of the current contacts and shunt layer.</description><subject>Cables</subject><subject>Coated conductors</subject><subject>High temperature superconductivity</subject><issn>0921-4534</issn><issn>1873-2143</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNqNkE1LAzEQhoMoWKs_QchJ9LCaj91kcxIpfhQKHlrPIZudtCvbbE2ySv-921a86lyGged9YR6ELim5pYSKuzlRjGZ5wfNrwm4IKSXL1BEa0VLyjNGcH6PRL3KKzmJ8J8NQRUdoNvUJgl0ZvwTcOWz7EMAnXEH6AvA4rvrhas0WAja-xi-LOXZNu8aNx23nl9h2JkGNk9lAPEcnzrQRLn72GL09PS4mL9ns9Xk6eZhllguVskLxkhknSsoFFERZK2pZMUahktxyXpaiGEBXUQFW5sRJW7oCTGFUXtZVzsfo6tC7Cd1HDzHpdRMttK3x0PVRMynoYEb-ByQ5JcUAFgfQhi7GAE5vQrM2Yasp0TvJei9Z7wxqwvReslZD7v6Qg-HdzwaCjrYBb6FuAtik6675o-EbjnaCow</recordid><startdate>20020801</startdate><enddate>20020801</enddate><creator>Usoskin, A.</creator><creator>Issaev, A.</creator><creator>Freyhardt, H.C.</creator><creator>Leghissa, M.</creator><creator>Oomen, M.P.</creator><creator>Neumueller, H.-W.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7U5</scope><scope>L7M</scope></search><sort><creationdate>20020801</creationdate><title>Interchange of current between shunt layer and HTS film in long coated tapes</title><author>Usoskin, A. ; Issaev, A. ; Freyhardt, H.C. ; Leghissa, M. ; Oomen, M.P. ; Neumueller, H.-W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c369t-59382af68136e509cc6d7b221eb73c338865369fb16ec740f7c8f5ea5a948db43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Cables</topic><topic>Coated conductors</topic><topic>High temperature superconductivity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Usoskin, A.</creatorcontrib><creatorcontrib>Issaev, A.</creatorcontrib><creatorcontrib>Freyhardt, H.C.</creatorcontrib><creatorcontrib>Leghissa, M.</creatorcontrib><creatorcontrib>Oomen, M.P.</creatorcontrib><creatorcontrib>Neumueller, H.-W.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physica. C, Superconductivity</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Usoskin, A.</au><au>Issaev, A.</au><au>Freyhardt, H.C.</au><au>Leghissa, M.</au><au>Oomen, M.P.</au><au>Neumueller, H.-W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Interchange of current between shunt layer and HTS film in long coated tapes</atitle><jtitle>Physica. C, Superconductivity</jtitle><date>2002-08-01</date><risdate>2002</risdate><volume>372</volume><spage>857</spage><epage>862</epage><pages>857-862</pages><issn>0921-4534</issn><eissn>1873-2143</eissn><abstract>In long-length HTS coated metallic tapes a shunt layer is required to subdue the influence of the hot spots as well as to equalize the potential between the HTS film and the metallic tape in the case when the transport current is near to its critical value. Both a modelling and measurements of current transfer between current contact, shunt layer and HTS film have been performed to optimize the architecture of the coated tapes. The model of current interchange allows to determine analytically the total power losses as well as the surface density of the power losses at the contact areas. Expressions derived for power dissipation lead to a criterion for the contact resistance,
R
s, and the length of the current contact,
L, of the given HTS/shunt/contact architecture. For a combination of YBCO and Au layers, for example, the
R
s must be <10
−5
Ω
cm
2 to ensure a relevant suppression of Joule's heat in these areas. A finite element model employed for the verification of calculated dependences yields additional peaks of power density at the edge of the current contact. The location of the peaks agrees with experimental observations. Experimental studies yield a threshold of 1 W/cm
2 for the power density, which would cause damage of the coated conductor. Tapes with lengths up to 2 m and critical currents up to 145 A per centimeter width (at 77 K, 0 T) were manufactured and tested in order to optimize parameters of the current contacts and shunt layer.</abstract><pub>Elsevier B.V</pub><doi>10.1016/S0921-4534(02)00872-9</doi><tpages>6</tpages></addata></record> |
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| ispartof | Physica. C, Superconductivity, 2002-08, Vol.372, p.857-862 |
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| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Cables Coated conductors High temperature superconductivity |
| title | Interchange of current between shunt layer and HTS film in long coated tapes |
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