CEA–CERN Block-Type Dipole Magnet for Cable Testing: FRESCA2

Rochepault, Etienne; Ferracin, P.

doi:10.1007/978-3-030-16118-7_12

Cited by 9 publications

(1 citation statement)

References 23 publications

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“…The size of the aperture is compatible with SULTAN samples [1] and will enable the test of insert coils with a larger diameter than those tested in FRESCA2 [3]. The high field and large aperture of EDIPO 2 call for a high current density block-coil similar to the one used for accelerator-relevant magnets like FRESCA2, [4].…”

Section: Introductionmentioning

confidence: 99%

Progress on the Upgrade of EDIPO, a 15 T Large Aperture Dipole

Araujo

Ballarino

Bordini

et al. 2021

IEEE Trans. Appl. Supercond.

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EDIPO 2 (the upgraded EDIPO test facility) will provide a unique testbed for superconducting cables for fusion magnets, accelerators, and other applications. Compared to the previous magnet assembly, the magnetic field is enhanced from 12.35 T to 15 T, the aperture is enlarged from 90×141 mm 2 to 144×144 mm 2 and the uniform field length is increased from 680 mm to 1000 mm (assuming a 1% drop of the field along the sample axis). A number of magnet designs have been proposed for EDIPO 2 since the conceptual design activities started in 2017. The design iterations have converged into a flared-end block-coil dipole design with a purely rectangular cross-section (coil windings aligned on the high and the low-field side). The use of a two-stage cable design is considered in order to increase the operating current, reduce the coil inductance and consequently limit the discharge voltage. The magnet structural design keeps the pre-compression applied to the coil winding pack to a minimum and allows a gap to open between the coils and the test well during operation. Progress on the magnet design activities is reported, including the results of magnetic and mechanical analyses, as well as quench protection studies. The procurement of the helium vessel required to contain the liquid helium bath for magnet cooling is also discussed. 

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Section: Introductionmentioning

confidence: 99%

Progress on the Upgrade of EDIPO, a 15 T Large Aperture Dipole

Araujo

Ballarino

Bordini

et al. 2021

IEEE Trans. Appl. Supercond.

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Machine learning applied to X-ray tomography as a new tool to analyze the voids in RRP Nb3Sn wires

Bagni¹,

Bovone²,

Rack³

et al. 2021

Sci Rep

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The electro-mechanical and electro-thermal properties of high-performance Restacked-Rod-Process (RRP) Nb3Sn wires are key factors in the realization of compact magnets above 15 T for the future particle physics experiments. Combining X-ray micro-tomography with unsupervised machine learning algorithm, we provide a new tool capable to study the internal features of RRP wires and unlock different approaches to enhance their performances. Such tool is ideal to characterize the distribution and morphology of the voids that are generated during the heat treatment necessary to form the Nb3Sn superconducting phase. Two different types of voids can be detected in this type of wires: one inside the copper matrix and the other inside the Nb3Sn sub-elements. The former type can be related to Sn leaking from sub-elements to the copper matrix which leads to poor electro-thermal stability of the whole wire. The second type is detrimental for the electro-mechanical performance of the wires as superconducting wires experience large electromagnetic stresses in high field and high current conditions. We analyze these aspects thoroughly and discuss the potential of the X-ray tomography analysis tool to help modeling and predicting electro-mechanical and electro-thermal behavior of RRP wires and optimize their design.

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