Analysis of the normal transition event of the LHD helical coils
Normal transitions and a subsequent quench were experienced with the pool-cooled helical coils of the Large Helical Device (LHD) during its excitation test. Although the initiated normal zone once started to recover, a disruptive transverse propagation followed and triggered an emergency discharging...
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| Veröffentlicht in: | IEEE transactions on applied superconductivity 2000-03, Vol.10 (1), p.610-613 |
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| creator | Yanagi, N. Imagawa, S. Mito, T. Iwamoto, A. Chikaraishi, H. Hamaguchi, S. Nishimura, A. Satow, T. Nakamura, Y. Satoh, S. Motojima, O. Gavrilin, A.V. |
| description | Normal transitions and a subsequent quench were experienced with the pool-cooled helical coils of the Large Helical Device (LHD) during its excitation test. Although the initiated normal zone once started to recover, a disruptive transverse propagation followed and triggered an emergency discharging program. The cryogenic stability of the composite-type superconductor has been studied by sample experiments as well as by numerical calculations. Due to the rather long magnetic diffusion time constant in the pure Al stabilizer, transient stability of the conductor seems to play an important role for driving finite propagation of a normal zone. The cause of the final quench is also discussed from the viewpoint of cooling deterioration due to a possible accumulation of He bubbles. |
| doi_str_mv | 10.1109/77.828308 |
| format | Article |
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Although the initiated normal zone once started to recover, a disruptive transverse propagation followed and triggered an emergency discharging program. The cryogenic stability of the composite-type superconductor has been studied by sample experiments as well as by numerical calculations. Due to the rather long magnetic diffusion time constant in the pure Al stabilizer, transient stability of the conductor seems to play an important role for driving finite propagation of a normal zone. 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(IEEE) 2000</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c543t-bc14e11dcd76fe0a0c078b69e24fea03a5fa77fe5bf6c27ac1c609e5a14082d3</citedby><cites>FETCH-LOGICAL-c543t-bc14e11dcd76fe0a0c078b69e24fea03a5fa77fe5bf6c27ac1c609e5a14082d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/828308$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,776,780,792,27901,27902,54733</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/828308$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Yanagi, N.</creatorcontrib><creatorcontrib>Imagawa, S.</creatorcontrib><creatorcontrib>Mito, T.</creatorcontrib><creatorcontrib>Iwamoto, A.</creatorcontrib><creatorcontrib>Chikaraishi, H.</creatorcontrib><creatorcontrib>Hamaguchi, S.</creatorcontrib><creatorcontrib>Nishimura, A.</creatorcontrib><creatorcontrib>Satow, T.</creatorcontrib><creatorcontrib>Nakamura, Y.</creatorcontrib><creatorcontrib>Satoh, S.</creatorcontrib><creatorcontrib>Motojima, O.</creatorcontrib><creatorcontrib>Gavrilin, A.V.</creatorcontrib><title>Analysis of the normal transition event of the LHD helical coils</title><title>IEEE transactions on applied superconductivity</title><addtitle>TASC</addtitle><description>Normal transitions and a subsequent quench were experienced with the pool-cooled helical coils of the Large Helical Device (LHD) during its excitation test. Although the initiated normal zone once started to recover, a disruptive transverse propagation followed and triggered an emergency discharging program. The cryogenic stability of the composite-type superconductor has been studied by sample experiments as well as by numerical calculations. Due to the rather long magnetic diffusion time constant in the pure Al stabilizer, transient stability of the conductor seems to play an important role for driving finite propagation of a normal zone. 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| source | IEEE Electronic Library (IEL) |
| subjects | Aluminum Coils Conductors Cooling Devices Emergencies Helical Hydrogen Indium tin oxide Mathematical analysis Plasma devices Superconducting coils Superconductors Testing Toroidal magnetic fields Voltage |
| title | Analysis of the normal transition event of the LHD helical coils |
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