Advanced Accelerator Magnets for Upgrading the LHC

Bottura, L.; Rijk, G. de; Rossi, L.; Todesco, E.

doi:10.1109/tasc.2012.2186109

Cited by 183 publications

(127 citation statements)

References 28 publications

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“…We therefore still have a strong margin for improvement: we need to optimize the wire in terms of geometry of the restacks, thickness of the external and internal Ag tubes, filament average dimensions, and in general filling factor. By increasing the fill factor from 18 to 28% we expect a straightforward improvement of the overall conductor density, which could reach values above 600 A/mm 2 , value which is estimated as a suitable value for high field applications [13], even more in wires prepared with a process which can be applied to long length wires and eventually industrialized in a quite immediate way, making it particularly appealing being faster and cheaper than any other.…”

Section: Figure2 Jc (Left Axis) and Je (Right Axis) For The A) Rectamentioning

confidence: 99%

New concept for the development of Bi-2212 wires for high-field applications

Leveratto

Braccini

Contarino

et al. 2016

Supercond. Sci. Technol.

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The first step towards high critical currents in Bi-2212 wires was the comprehension that the supercurrent is blocked over long lengths by filament-diameter bubbles grown during the melt stage, which cause expansion of the wire diameter and dedensification of the superconducting filaments.Whereas the previous successful approach to reduce the problem of voids related to bubbles was based on the application of a high overpressure during the heat treatment, we fabricated Bi-2212 wires by applying a new concept of suitably alternating groove-rolling and drawing techniques with the aim of densifying the phase already during the working procedure prior to the heat treatment.We here for the first time were able to reach in wires reacted with closed ends -i.e. with gas trapped in the wire as it happens in long-length wires -the very same values of critical current shown in short wires reacted with open ends. This is the irrefutable evidence that, only by acting on the deformation technique, we were able to raise the critical current by properly densifying the superconducting powder inside the filaments already before the melt stage. Whole-conductor current densities in our long length simulation wires already reach 400 A/mm 2 at 4.2 K and 5 T, which can be still easily increased through architecture optimization. The actual breakthrough is that the densification is optimized without further complex treatments through a technique which can be straightforwardly applied to long-lengths wires.

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Section: Figure2 Jc (Left Axis) and Je (Right Axis) For The A) Rectamentioning

confidence: 99%

New concept for the development of Bi-2212 wires for high-field applications

Leveratto

Braccini

Contarino

et al. 2016

Supercond. Sci. Technol.

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“…Because of this, very high J c is only accessible in strands of diameter < 1 mm, if the filament diameter is <50 (70) μm and the RRR is largeabove 100. Achieving simultaneously high J c with small filaments and high RRR is challenging for any of the leading wire manufacturing routes 10) .…”

Section: Superconductor Randdmentioning

confidence: 99%

Superconducting Magnet Development for the LHC Upgrades

Rossi

2012

TEION KOGAKU

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LHC is now delivering proton and heavy ion collisions at the highest energy. Upgrading the LHC beyond its design performance is a long term program that started during the LHC construction, with some fundamental R&D programs.The upgrade program is based on a vigorous superconductor and magnet R&D, aimed at increasing the field in Review ArticleSuperconducting Magnet Development for the LHC Upgrades Lucio ROSSI * Synopsis: LHC is now delivering proton and heavy ion collisions at the highest energy. Upgrading the LHC beyond its design performance is a long term program that started during the LHC construction, with some fundamental R&D programs. The upgrade program is based on a vigorous superconductor and magnet R&D, aimed at increasing the field in accelerator magnets from 8 T to 12 T for the luminosity upgrade, with the scope of increasing the collider luminosity by a factor 5 to 10 from 2022. The upgrade program might continue with the LHC energy upgrade, which would require magnets producing field in the range of 16-20 T. The results obtained so far and the future challenges are discussed together with the possible plan to reach the goals.

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“…Among its activities, the Work Package 7 is dedicated to superconducting high field magnets for higher luminosities and energies. This work package has as key objective the fabrication and test of FRESCA2, a 100 mm aperture dipole generating a bore field of 13 T [2], [3]. The magnet, which will rely on Nb 3 Sn superconductors, is aimed at upgrading the CERN cable test facility FRESCA [4], which uses Nb-Ti superconductors, bringing the bore field from 10 T to 13 T. In addition, it will provide the background field for an HTS insert [5].…”

Section: Introductionmentioning

confidence: 99%

Development of the EuCARD $\hbox{Nb}_{3}\hbox{Sn}$ Dipole Magnet FRESCA2

Ferracin

Devaux

Durante

et al. 2013

IEEE Trans. Appl. Supercond.

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The key objective of the Superconducting High Field Magnet work package of the European Project EuCARD, and specifically of the High Field Model task, is to design and fabricate the Nb3Sn dipole magnet FRESCA2. With an aperture of 100 mm and a target bore field of 13 T, the magnet is aimed at upgrading the FRESCA cable test facility at CERN. The design features four 1.5 m long double-layer coils wound with a 21 mm wide cable. The windings are contained in a support structure based on a 65 mm thick aluminum shell pre-tensioned with bladders. In order to qualify the assembly and loading procedure and to validate the finite element stress computations, the structure will be assembled around aluminum blocks, which replace the superconducting coils, and instrumented with strain gauges. In this paper, we report on the status of the assembly and we update on the progress on design and fabrication of tooling and coils. With an aperture of 100 mm and a target bore field of 13 T, the magnet is aimed at upgrading the FRESCA cable test facility at CERN. The design features four 1.5 m long double-layer coils wound with a 21 mm wide cable. The windings are contained in a support structure based on a 65 mm thick aluminum shell pre-tensioned with bladders. In order to qualify the assembly and loading procedure and to validate the finite element stress computations, the structure will be assembled around aluminum blocks, which replace the superconducting coils, and instrumented with strain gauges. In this paper, we report on the status of the assembly and we update on the progress on design and fabrication of tooling and coils.

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Advanced Accelerator Magnets for Upgrading the LHC

Cited by 183 publications

References 28 publications

New concept for the development of Bi-2212 wires for high-field applications

New concept for the development of Bi-2212 wires for high-field applications

Superconducting Magnet Development for the LHC Upgrades

Development of the EuCARD $\hbox{Nb}_{3}\hbox{Sn}$ Dipole Magnet FRESCA2

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