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ENEA - Fusion division

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Superconductivity: Small Magnet Testing Facility

Contact: Luigi Muzzi
e-mail: muzzi@frascati.enea.it
tel.: +39 06 9400 5391
fax.: +39 06 9400 5393

The experience gained over the years in testing the numerous inserts in NbTi and Nb3Sn (SAFO, PUFF, Sex) and the recently renewed apparatus has made the ENEA Superconductivity laboratory a good candidate for present and future tests of sub-size conductors and magnets in ITER-relevant operational conditions. The aim of these experiments is to study "quench" stability and propagation in conductors cooled by forced circulation of supercritical helium (cable-in-conduit conductors) and the study of the influence of current distribution on the magnet performance. The numerous sensors and diagnostics with which the magnets are equipped for their complete characterisation also make these experiments ideal candidates for the validation of numerical simulation codes.

solenoidal superconductor small magnets test plantsolenoidal superconductor small
magnets test plant

The available facility consists of:

At present the facility houses the AStEx (Advanced Stability Experiment). The aim of the experiment is to study the influence of current distribution on the conductor properties, such as critical current, I-V characteristics, AC losses and stability.
The ASTEX magnet consists of a CICC-type conductor of 36 NbTi strands, which has been opened at both terminals and sub-divided into 4 sub-phases of the conductor, each one consisting of 9 strands. One of these groups has been further subdivided. The identification of the different groups of strands and a system of external resistors will allow the module to be supplied by a given current distribution, artificially imposed externally and hence it will be possible to study its effect on the electrical properties of the conductor. The module will be supplied by a maximum current of 6 kA, immersed in a background field of 2.5 T, and will be operated at a temperature of 5K and an input helium pressure of around 10 bar.