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 |
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| creator | 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 |
| description | 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. |
| doi_str_mv | 10.1109/TASC.2019.2899284 |
| format | Article |
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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. 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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. 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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. 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| source | IEEE Electronic Library (IEL) |
| subjects | 11 T dipole Apertures Cables Coils Collimation Collimators Dipoles High Luminosity LHC Large Hadron Collider Luminosity Magnetomechanical effects Magnets Mechanical analysis Nb<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">3 Sn magnets Performance degradation Power cable insulation Power cables Strain gauges Stress Stress measurement |
| title | Mechanical Analysis of the Collaring Process of the 11 T Dipole Magnet |
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