Analysis of the mechanical behaviour of an 11.5 T Nb3Sn LHC dipole magnet according to the ring collar concept

A. den Ouden, H.H.J. ten Kate, D. ter Avest, W. van Emden, C. Daum

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    According to the CERN-LHC (Large Hadron Collider) reference design, 10-tesla twin-aperture NbTi dipoles will be built with split collars that enclose both apertures. As part of the development program towards an experimental 11.5-tesla Nb3Sn LHC dipole magnet, the mechanical implications of an alternative collar concept have been studied with a finite element analysis. In this concept ring shaped collars are shrunk on each finished single aperture coil, thus providing the necessary room-temperature prestress. This system results in a major improvement of the stress distribution in the collars. It is noted that introduction of friction at the sliding planes can cause reopening of the gap between the yoke halves during excitation. This depends strongly on the value of the friction coefficients
    Original languageEnglish
    Pages (from-to)331-334
    Number of pages4
    JournalIEEE transactions on magnetics
    Issue number1
    Publication statusPublished - 1992
    Event12th International Conference on Magnet Technology, MT-12 1991 - Leningrad (St. Petersburg), Russian Federation
    Duration: 24 Jun 199128 Jun 1991
    Conference number: 12

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