| Applications |
| New success for MaNEP's partner Bruker Biospin / by Prof. René Flukiger* | ||
Bruker BioSpin, a MaNEP industrial partner, recently announced the realization of its new 950 US2 superconducting NMR magnet, the world's first actively shielded 950 MHz magnet, corresponding to a magnetic field of 22.3 T [ Bruker 's press release ] The collaboration between MaNEP and Bruker BioSpin follows the main goal of characterizing and improving the current-carrying capacity of superconducting wires in view of NMR spectroscopy systems operating at very high magnetic fields. |
in the frame of MaNEP is that of a technology demonstrator, following a “proof-of-concept” strategy. The concept of active shielding of high field magnets, first developed by Bruker BioSpin, has been realized for a 21 T laboratory magnet which was donated to the University of Geneva in the frame of the MaNEP collaboration [ PDF : more infos from MaNEP's website - in French ]. The University of Geneva contributed to the achievement of this class of high field magnets by an advanced characterization of Nb3Sn superconducting wires at 4.2 K under the effect of mechanical stresses up to 21 T. The laboratory has worldwide unique measuring facilities for determining the effect of Lorentz forces on industrial superconducting wires of the type used in the new 950 MHz system. The effect of both uniaxial tensile and transverse compressive stresses on superconducting wires can be measured very precisely up to 21 T. The knowledge of the response of the current density to mechanical sollicitation, is essential in view of the optimization of the magnet performance at very high fields. |
Another objective of the collaboration between MaNEP and Bruker BioSpin is to study advanced Nb3Sn wire fabrication methods for applications at fields above 22.3 T. The laboratory at the University of Geneva has the required infrastructure for producing multifilamentary prototype Nb3Sn wires with more than 10’000 filaments of 5  m diameter as well as configurations close to those of industrial wires. The development of superconducting wires in this group comprises the study of the metallurgical properties of the Nb3Sn phase, as well as improved deformation technologies. It also includes TEM results obtained in collaboration with the EPFL, demonstrating the necessity to control the growth processes at the nanometric scale. *Prof. René Flukiger is retired from UniGe since 2005. He is the driving force of the very successful partnership with Bruker Biospin AG among others and as a passionnate of applied physics he still plays an important role in this key project for MaNEP. |
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