A possible explanation of the problem of ramp rate limitation in large superconducting magnets
Unexpected ramp rate limitations were found in large superconducting magnets for fusion experiments as well as in accelerator magnets. In this paper it is shown that a variation of the field sweep rate dB/dt along the length of a superconducting cable induces superposed extra coupling currents flowi...
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| Veröffentlicht in: | IEEE Transactions on Magnetics 1996-07, Vol.32 (4), p.2340-2344 |
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| container_title | IEEE Transactions on Magnetics |
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| creator | Krempasky, L. Schmidt, C. |
| description | Unexpected ramp rate limitations were found in large superconducting magnets for fusion experiments as well as in accelerator magnets. In this paper it is shown that a variation of the field sweep rate dB/dt along the length of a superconducting cable induces superposed extra coupling currents flowing over long lengths. These "supercurrents" lead to a highly nonhomogeneous current distribution in the cable and to additional coupling losses ("supercurrent losses"), even in magnet sections with dB/dt=0. These both effects may drastically reduce the stability of a magnet during fast ramp up. The solution of the diffusion equation allows us to calculate the space and time dependence of supercurrents as well as of supercurrent losses. The time constants of supercurrents are many orders of magnitude larger than typical coupling time constants of a superconducting cable. The proposed model can explain typical results of ramp rate limitations in large magnets. |
| doi_str_mv | 10.1109/20.511342 |
| format | Article |
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In this paper it is shown that a variation of the field sweep rate dB/dt along the length of a superconducting cable induces superposed extra coupling currents flowing over long lengths. These "supercurrents" lead to a highly nonhomogeneous current distribution in the cable and to additional coupling losses ("supercurrent losses"), even in magnet sections with dB/dt=0. These both effects may drastically reduce the stability of a magnet during fast ramp up. The solution of the diffusion equation allows us to calculate the space and time dependence of supercurrents as well as of supercurrent losses. The time constants of supercurrents are many orders of magnitude larger than typical coupling time constants of a superconducting cable. The proposed model can explain typical results of ramp rate limitations in large magnets.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/20.511342</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>United States: IEEE</publisher><subject>70 PLASMA PHYSICS AND FUSION ; ACCELERATORS ; Coupling circuits ; ELECTRIC CURRENTS ; ENERGY LOSSES ; Equivalent circuits ; LIMITING VALUES ; Magnetic field measurement ; MAGNETIC FIELDS ; MATHEMATICAL MODELS ; PARTICLE ACCELERATORS ; PHYSICS ; Power cables ; STABILITY ; Steady-state ; Superconducting cables ; SUPERCONDUCTING MAGNETS ; THERMONUCLEAR DEVICES ; Voltage ; Wires</subject><ispartof>IEEE Transactions on Magnetics, 1996-07, Vol.32 (4), p.2340-2344</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c365t-2c30eb4d361ccc7bd141e844fee71d0dcdc754ab64d8d73c5a81da97d68416003</citedby><cites>FETCH-LOGICAL-c365t-2c30eb4d361ccc7bd141e844fee71d0dcdc754ab64d8d73c5a81da97d68416003</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/511342$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,776,780,792,881,27901,27902,54733</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/511342$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/287640$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Krempasky, L.</creatorcontrib><creatorcontrib>Schmidt, C.</creatorcontrib><title>A possible explanation of the problem of ramp rate limitation in large superconducting magnets</title><title>IEEE Transactions on Magnetics</title><addtitle>TMAG</addtitle><description>Unexpected ramp rate limitations were found in large superconducting magnets for fusion experiments as well as in accelerator magnets. In this paper it is shown that a variation of the field sweep rate dB/dt along the length of a superconducting cable induces superposed extra coupling currents flowing over long lengths. These "supercurrents" lead to a highly nonhomogeneous current distribution in the cable and to additional coupling losses ("supercurrent losses"), even in magnet sections with dB/dt=0. These both effects may drastically reduce the stability of a magnet during fast ramp up. The solution of the diffusion equation allows us to calculate the space and time dependence of supercurrents as well as of supercurrent losses. The time constants of supercurrents are many orders of magnitude larger than typical coupling time constants of a superconducting cable. The proposed model can explain typical results of ramp rate limitations in large magnets.</description><subject>70 PLASMA PHYSICS AND FUSION</subject><subject>ACCELERATORS</subject><subject>Coupling circuits</subject><subject>ELECTRIC CURRENTS</subject><subject>ENERGY LOSSES</subject><subject>Equivalent circuits</subject><subject>LIMITING VALUES</subject><subject>Magnetic field measurement</subject><subject>MAGNETIC FIELDS</subject><subject>MATHEMATICAL MODELS</subject><subject>PARTICLE ACCELERATORS</subject><subject>PHYSICS</subject><subject>Power cables</subject><subject>STABILITY</subject><subject>Steady-state</subject><subject>Superconducting cables</subject><subject>SUPERCONDUCTING MAGNETS</subject><subject>THERMONUCLEAR DEVICES</subject><subject>Voltage</subject><subject>Wires</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNqF0UtLxDAQAOAgCq6rB6-e4kXw0DXTJml7XBZfsOBFr4Y0me5G-rJJQf-9LV287mXCMB_DTIaQa2ArAJY_xGwlABIen5AF5BwixmR-ShaMQRblXPJzcuH915hyAWxBPte0a713RYUUf7pKNzq4tqFtScMeade3Y6We0l7X3RgC0srVLszMNbTS_Q6pHzrsTdvYwQTX7Gitdw0Gf0nOSl15vDq8S_Lx9Pi-eYm2b8-vm_U2MokUIYpNwrDgNpFgjEkLCxww47xETMEya6xJBdeF5DazaWKEzsDqPLUy4yAZS5bkdu7b-uCUNy6g2Y_jNGiCirNU8snczWZc6ntAH1TtvMFq3Bnbwas4Z0yIND0OMyFikWfHoUxAgpw63s_Q9ONn91iqrne17n8VMDXdTcVMzXcb7c1sHSL-u0PxD3P6kt0</recordid><startdate>19960701</startdate><enddate>19960701</enddate><creator>Krempasky, L.</creator><creator>Schmidt, C.</creator><general>IEEE</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>7U5</scope><scope>OTOTI</scope></search><sort><creationdate>19960701</creationdate><title>A possible explanation of the problem of ramp rate limitation in large superconducting magnets</title><author>Krempasky, L. ; Schmidt, C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c365t-2c30eb4d361ccc7bd141e844fee71d0dcdc754ab64d8d73c5a81da97d68416003</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>70 PLASMA PHYSICS AND FUSION</topic><topic>ACCELERATORS</topic><topic>Coupling circuits</topic><topic>ELECTRIC CURRENTS</topic><topic>ENERGY LOSSES</topic><topic>Equivalent circuits</topic><topic>LIMITING VALUES</topic><topic>Magnetic field measurement</topic><topic>MAGNETIC FIELDS</topic><topic>MATHEMATICAL MODELS</topic><topic>PARTICLE ACCELERATORS</topic><topic>PHYSICS</topic><topic>Power cables</topic><topic>STABILITY</topic><topic>Steady-state</topic><topic>Superconducting cables</topic><topic>SUPERCONDUCTING MAGNETS</topic><topic>THERMONUCLEAR DEVICES</topic><topic>Voltage</topic><topic>Wires</topic><toplevel>online_resources</toplevel><creatorcontrib>Krempasky, L.</creatorcontrib><creatorcontrib>Schmidt, C.</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>OSTI.GOV</collection><jtitle>IEEE Transactions on Magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Krempasky, L.</au><au>Schmidt, C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A possible explanation of the problem of ramp rate limitation in large superconducting magnets</atitle><jtitle>IEEE Transactions on Magnetics</jtitle><stitle>TMAG</stitle><date>1996-07-01</date><risdate>1996</risdate><volume>32</volume><issue>4</issue><spage>2340</spage><epage>2344</epage><pages>2340-2344</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>Unexpected ramp rate limitations were found in large superconducting magnets for fusion experiments as well as in accelerator magnets. In this paper it is shown that a variation of the field sweep rate dB/dt along the length of a superconducting cable induces superposed extra coupling currents flowing over long lengths. These "supercurrents" lead to a highly nonhomogeneous current distribution in the cable and to additional coupling losses ("supercurrent losses"), even in magnet sections with dB/dt=0. These both effects may drastically reduce the stability of a magnet during fast ramp up. The solution of the diffusion equation allows us to calculate the space and time dependence of supercurrents as well as of supercurrent losses. The time constants of supercurrents are many orders of magnitude larger than typical coupling time constants of a superconducting cable. The proposed model can explain typical results of ramp rate limitations in large magnets.</abstract><cop>United States</cop><pub>IEEE</pub><doi>10.1109/20.511342</doi><tpages>5</tpages></addata></record> |
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| ispartof | IEEE Transactions on Magnetics, 1996-07, Vol.32 (4), p.2340-2344 |
| issn | 0018-9464 1941-0069 |
| language | eng |
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| source | IEEE Electronic Library (IEL) |
| subjects | 70 PLASMA PHYSICS AND FUSION ACCELERATORS Coupling circuits ELECTRIC CURRENTS ENERGY LOSSES Equivalent circuits LIMITING VALUES Magnetic field measurement MAGNETIC FIELDS MATHEMATICAL MODELS PARTICLE ACCELERATORS PHYSICS Power cables STABILITY Steady-state Superconducting cables SUPERCONDUCTING MAGNETS THERMONUCLEAR DEVICES Voltage Wires |
| title | A possible explanation of the problem of ramp rate limitation in large superconducting magnets |
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