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The LNCMI-Toulouse realizes the longest 80-T pulse of magnetic field in the world

In 2011 we have seen considerable progress in the strength of pulsed magnetic fields. The Hochfeldlabor Dresden-Rossendorf has established a new world record non-destructive field at 91,4 T, which was soon after broken by the NHMFL-Pulsed Field Facility at Los Alamos, reaching 97,4 T. These records represent important progress in magnet technology, and suggest that the magical limit of 100 T is now within reach. However, one should always bear in mind that these magnets are research tools, and their utility depends not exclusively on the field strength. Other factors, like pulse duration and bore size are essential for the realization of state-of-the-art high field measurements. Part of the progress obtained with the recent record fields was at the expense of these other parameters, limiting the usefulness of such magnets for experiments.

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Figure 1 : Profiles of pulsed magnetic field from the different facilities in the world, comparison of the duration above 70 T and maximum field, and first resistivity measurement in a high-temperature superconductor up to 80 Tesla in Toulouse (January 2012).

Until the new mobile fast 6 MJ generator will be available (end of 2012), the LNCMI engineers at the Toulouse pulsed field facility focus on offering the optimal conditions at sub-record field strengths. The newest double coil system that was recently put into operation in Toulouse ‘only’ generates 81,3 T, but offers a record field duration of 10,2 ms above 70 T, reducing eddy current problems and facilitating high quality data acquisition. First magnetoresistance experiments performed on a high-temperature superconductor have shown that the experimental resolution using this new generation of magnet is excellent.

Figure 2: LNCMI coilin-coilex 80-T magnet (Photo: © W Knafo).

Coil Team : Jérôme Béard, Julien Billette, Paul Frings, Maha Suleiman