Mechanical Analysis of the Collaring Process of the 11 T Dipole Magnet

As part of the Large Hadron Collider (LHC) accelerator upgrades foreseen by the high luminosity-LHC project, the CERN 11 T program is aimed at replacing standard LHC Nb-Ti main dipole magnets, operating with a bore field of 8.3 T, with pairs of shorter Nb 3 Sn dipole magnets with a bore field of 11...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2019-08, Vol.29 (5), p.1-5
Hauptverfasser: Ferracin, Paolo, Bottura, Luca, Bourcey, Nicolas, Daly, Michael, Devred, Arnaud, Bermudez, Susana Izquierdo, Troitino, Jose Ferradas, Ferradas Troitino, Salvador, Grosclaude, Philippe, Guinchard, Michael, Loffler, Christian, Nilsson, Emelie, Perez, Juan Carlos, Fernandez, Jose Luis Rudeiros, Savary, Frederic, Vallone, Giorgio, Wolf, Felix
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Sprache:eng
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Zusammenfassung:As part of the Large Hadron Collider (LHC) accelerator upgrades foreseen by the high luminosity-LHC project, the CERN 11 T program is aimed at replacing standard LHC Nb-Ti main dipole magnets, operating with a bore field of 8.3 T, with pairs of shorter Nb 3 Sn dipole magnets with a bore field of 11 T and the same total integrated field, thus providing space for additional collimators in the dispersion suppressor region. At the time of the submission of this paper, six single-aperture and two double-aperture short models have been fabricated and tested. As a result of a degraded quench performance observed in some of the short models, attributed to excessive stress on the Nb3Sn coil mid-planes, a thorough investigation of the room temperature loading procedure, and in particular of the collaring process, has been launched. A 150-mm-long collared coil mockup, instrumented with strain gauges and pressure sensitive films, has been used to study the peak stresses experienced by the brittle and strain sensitive Nb 3 Sn cables in the different phases of the collaring and as a function of coils' size and collaring force. In this paper, the results of the test campaign are described.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2019.2899284