Development and manufacturing of a Nb3Sn quadrupole magnet Model at CEA/Saclay for TESLA Interaction Region

CEA/DSM/DAPNIA/SACM, Gif-sur-Yvette, France
IEEE Transactions on Applied Superconductivity (Impact Factor: 1.32). 07/2004; DOI: 10.1109/TASC.2004.829129
Source: IEEE Xplore

ABSTRACT One possible application of Nb3Sn, whose superconducting properties far exceed those of NbTi, is the fabrication of short and powerful quadrupole magnets for the interaction regions of large particle accelerators. In some projects, as in the future linear collider TESLA, the quadrupole magnets are inside the detector solenoid and must operate in its background field. This situation gives singular Lorentz force distribution in the ends of the magnet. To learn about Nb3Sn technology, evaluate fabrication techniques and test the interaction with a solenoidal field, DAPNIA/SACM at CEA/Saclay has started the manufacturing of a 1-m-long, 56-mm-single-aperture quadrupole magnet model. The model relies on the same coil geometry as the LHC arc quadrupole magnets, but has no iron yoke. It will produce a nominal field gradient of 211 T/m at 11,870 A. The coils are wound from Rutherford-type cables insulated with glass fiber tape, before being heat-treated and vacuum-impregnated with epoxy resin. Laminated, collars, locked around the coil assembly by means of keys restrain the Lorentz forces. After a recall of the conceptual design, the paper will review the progress in the manufacturing and test of the main components as well as the design and delivery of the main tooling. The first coil should be wounded and reacted during the last quarter of the year 2003.

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    ABSTRACT: Superconducting magnet technology is continually evolving in order to meet the demanding needs of new accelerators and to provide necessary upgrades for existing machines. A variety of designs are now under development, including high fields and gradients, rapid cycling and novel coil configurations. This paper presents a summary of R&D programs in the EU, Japan and the USA. A performance comparison between NbTi and Nb<sub>3</sub>Sn along with fabrication and cost issues are also discussed.
    IEEE Transactions on Applied Superconductivity 07/2005; DOI:10.1109/TASC.2005.849530 · 1.32 Impact Factor
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    ABSTRACT: Pushing accelerator magnets beyond 10 T holds a promise of future upgrades to machines like the Tevatron at Fermilab and the LHC at CERN. Exceeding the current density limits of NbTi superconductor, Nb 3 Sn is at present the only practical superconductor capable of generating fields beyond 10 T. Several Nb 3 Sn pilot magnets, with fields as high as 16 T, have been built and tested, paving the way for future attempts at fields approaching 20 T. High current density conductor is required to generate high fields with reduced conductor volume. However this significantly increases the Lorentz force and stress. Future designs of coils and structures will require managing stresses of several 100’ s of MPa and forces of 10’ s of MN/m. The combined engineering requirements on size and cost of accelerator magnets will involve magnet technology that diverges from the one currently used with NbTi conductor. In this paper we shall address how far the engineering of high field magnets can be pushed, and what are the issues and limitations before such magnets can be used in particle accelerators.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005

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