Characterization of YBCO Coated Conductors Under High Magnetic Field at LNCMI

Abstract

The second generation (2G) HTS conductors, the YBaCuO Coated Conductors, show very exciting performances in terms of critical currents under very high fields whereas their mechanical properties, the key issues for very high field magnets, are outstanding for the IBAD (Ion Beam Assisted Deposition) route. Preliminary measurements have shown critical currents Ic above 500 A at 15 T and 4 K on commercial YBCO coated conductors. They are now available in reasonable length and manufacturing focus to provide reliable, consistent performance conductors. With these high critical current and tensile strength above 600 MPa, these conductors are very promising for making HTS superconducting coils able to generate very high field. But very few characterizations exist above 20 T. LNCMI is one of the few facilities in the world where such measurement can be performed.

Performance Tests of Prototype High-Field HTS Coils in Grenoble

“…Based on the same methodological approach, we will describe two separate experiments on small HTS prototype coils carried out using the LNCMI facilities [16]- [18] by the three collaborating parties CEA-Saclay, G2Elab/Institut Néel, and LNCMI. We report firstly the test carried out at ø 170 mm bore 19 T site on a heavily instrumented double pancake coil to measure the quench propagation at various operating conditions, in the interest of establishing a coil winding and instrumentation method and investigating quench dynamics.…”

HTS Dipole Insert Developments

“…It permits to reach the very high field required thanks to their outstanding in field current capacities. In order to produce these kinds of magnets, the orientation of the field with respect to the HTS tape should be studied with caution [3], innovative protection scheme is needed [4], [5] and some technological developments are needed to withstand the high stress level. The objective of the study is to build a HTS magnet producing 6 T in an aperture of 99 mm inserted in a Nb 3 Sn dipole of 13 T [6].…”