A5019312579- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Fusion materials and technologies
- HVDC Systems and Fault Protection
- Medical Imaging Techniques and Applications
- Thermal Analysis in Power Transmission
- Physics of Superconductivity and Magnetism
- Nuclear Physics and Applications
European Organization for Nuclear Research
2017-2024
TU Bergakademie Freiberg
2017-2018
CEA Paris-Saclay - Etablissement de Saclay
2016
CEA Paris-Saclay
2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016
A key challenge for a future circular collider (FCC) with centre-of-mass energy of 100 TeV and circumference in the range km is development high-field superconducting accelerator magnets, capable providing 16 T dipolar field quality 50 mm aperture. This paper summarizes strategy actions being undertaken framework FCC Magnet Technology Program Work Package 5 EuroCirCol.
A next step of energy increase hadron colliders beyond the LHC requires high-field superconducting magnets capable providing a dipolar field in range 16 T 50-mm aperture with accelerator quality. These characteristics could meet requirements for an upgrade to twice present beam or 100-TeV center mass future circular collider. This paper summarizes activities and plans development these magnets, inand U.S. Magnet Development Program.
In the framework of Future Circular Collider design study for a 100 TeV circular collider, 16 T superconducting bending magnets based on Nb3Sn technology are being developed. A pre-stress conductor during magnet assembly at room temperature (RT) is needed to counteract Lorentz forces operation. The properties brittle superconductor strain sensitive and excessive leads an irreversible degradation superconductor. order determine level acceptable process, reacted impregnated cables were exposed...
Future high temperature superconductor (HTS) field magnets using multitape HTS cables need 10-kA low-resistance connections. The connections are needed between the poles of and at terminals in a wide-operating range, from 1.9–85 K. EuCARD-WP10 Magnets collaboration aims testing HTS-based Roebel an accelerator magnet. Usually, low (LTS) jointed inside relatively short soldered block. Powering tests CERN have highlighted excess heating joint following classical LTS design. assembled...
For the optimization of Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn superconducting accelerator magnet design and assembly parameters stress-strain behavior coils needs to be known. We have measured stiffness Rutherford cable stacks with different epoxy volume fraction. The stack is strongly dependent on load direction. highest about 95 GPa in axial direction, as predicted by rule mixtures. In transverse direction stress...
As part of the Large Hadron Collider (LHC) accelerator upgrades foreseen by high luminosity-LHC project, CERN 11 T program is aimed at replacing standard LHC Nb-Ti main dipole magnets, operating with a bore field 8.3 T, pairs shorter Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn magnets and same total integrated field, thus providing space for additional collimators in dispersion suppressor region. At time submission this paper,...
Coils of high-field Nb3Sn magnets are submitted to large loads during assembly at ambient temperature and operation cold. This paper addresses the characterization stress distribution on reacted impregnated Rutherford cables under transverse compression, temperature, in a similar configuration as seen magnet assembly. We performed an experimental campaign cable stacks. Different test configurations have been compared order optimize homogeneity applied contact surface. The surface...
We have directly measured, for the first time, Nb3Sn and Cu loading strains stresses in 11 T dipole coil segments upon compressive using neutron diffraction. For this purpose a load frame that enables rotation of sample axis with respect to scattering geometry was installed Stress-Spec beamline at Heinz Maier-Leibnitz FRM II source. The diffraction data suggests magnet wound Rutherford type cables can be considered as fibre reinforced composite material. In axial direction is mainly carried...
During Rutherford cable production the wires are plastically deformed and their initially round shape is distorted. Using X-ray absorption tomography we have determined 3D of an unreacted Nb3Sn 11 T dipole cable, a reacted impregnated double stack. State-of-the-art image processing was applied to correct for tomographic artefacts caused by large aspect ratio, segmentation individual subelement bundles inside wires, calculation wire cross sectional area variations. The section oscillates 2%...
Abstract For next-generation accelerator magnets for fields beyond those achievable using Nb–Ti, Nb 3 Sn is the most viable superconductor. The high luminosity upgrade Large Hadron Collider (HL-LHC) marks an important milestone as it will be first project where installed in accelerator. a brittle intermetallic, so magnet coils are typically wound from composite strands containing ductile precursors before heat treating wire components to form Sn. However, some mechanical assembly still...
The Nb3Sn superconductor in accelerator magnets must resist high mechanical stresses. In order to better understand the effect of coil impregnation system on stresses exerted strain-sensitive superconductor, we have measured elastic strain evolution conductor constituents under externally applied loads. For this purpose, a dedicated load frame that enables rotation sample axis with respect neutron scattering geometry was installed Stress-Spec beamline at source Heinz Maier-Leibnitz FRM II....
In the design of superconducting accelerator magnets, shape coil cross section is mainly driven by minimization conductor volume, constrained requirements on central magnetic field and its homogeneity. Such optimizations commonly assume either a Block or Cosine Theta type, which then filled with (predetermined) rectangular key-stoned Rutherford cables. By optimizing positions, angles, number turns, quality cost are achieved. However, this leaves to wonder what optimal geometry looks like,...
The use of superconducting composite cables based on Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn, an intermetallic compound Niobium and Tin, is one the favorite routes to reach magnetic fields higher than 10 T in state-of-the-art accelerator magnets. brittle nonlinear nature epoxy-impregnated Sn Rutherford cable makes challenging predict its mechanical limits and, consequently, overall performance magnet. In case collared...
The performance of accelerator magnets is strongly relying on the dielectric strength and mechanical robustness insulation system. This in particular relevant for current development high field superconducting Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn with system made from resin-impregnated glass fibres. During assembly operation at cold temperature, this exposed to compressive shear stresses. focus study was investigation...