Thermal and mechanical effects of quenches on Nb{sub 3}Sn high field hadron collider magnets

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Thermal and its resulting mechanical stress due to quenches inside short and long epoxy impregnated Nb{sub 3}Sn high field magnets are studied with a quench simulation program, Kuench, and ANSYS program. For the protection of a long high field magnet, we have to use heaters to dump the stored energy uniformly inside the magnet, after detection of a spontaneous quench. The time delay of starting a forced quench with heaters, is estimated using ANSYS. Using this information, the thermal distribution in two-dimensional magnet cross section is studied. First a one meter model magnet with a dump resistor is used to ... continued below

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85 Kilobytes pages

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al., Ryuji Yamada et November 5, 2001.

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Thermal and its resulting mechanical stress due to quenches inside short and long epoxy impregnated Nb{sub 3}Sn high field magnets are studied with a quench simulation program, Kuench, and ANSYS program. For the protection of a long high field magnet, we have to use heaters to dump the stored energy uniformly inside the magnet, after detection of a spontaneous quench. The time delay of starting a forced quench with heaters, is estimated using ANSYS. Using this information, the thermal distribution in two-dimensional magnet cross section is studied. First a one meter model magnet with a dump resistor is used to estimate the effects and then a 10 meter long magnet is studied. The two-dimensional temperature distributions in the magnet cross sections are recorded every 5 ms, and visually displayed. With this visual animation displays we can understand intuitively the thermal and quench propagation in 2-dimensional field. The quenching cables get heated locally much more than the surrounding material and non-quenching conductor cables. With a one meter magnet with a dump resistor of 30 m{Omega}, typically only the quench starting cables and its neighbor cables get heated up to 100 K without significant effects from the heaters. With a10 meter magnet, heaters cause the quenches to most of the conductor blocks. The quench initiating cables get up to 250 to 300 K in 100 ms, but the surrounding and wedges are not heated up significantly. This causes the excessive stress in the quenching conductors and in their insulation material locally. The stress and strain in the conductor as well as in the insulation become excessive, and they are studied using the ANSYS stress analysis, using Von Mises criterion. It is concluded that for the one meter magnet with the presented cross section and configuration, the thermal effects due to the quench is tolerable. But we need much more quench study and improvements in the design for the extended ten meter long magnet [1].

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85 Kilobytes pages

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  • Snowmass 2001, Snowmass, CO (US), 07/01/2001--07/20/2001

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  • Report No.: FERMILAB-Conf-01/314-E
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 788289
  • Archival Resource Key: ark:/67531/metadc715608

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 5, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 1, 2016, 6:01 p.m.

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al., Ryuji Yamada et. Thermal and mechanical effects of quenches on Nb{sub 3}Sn high field hadron collider magnets, article, November 5, 2001; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc715608/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.