A&T Seminar

High Performance HTS Tapes for High Field Magnet Applications

by Prof. Venkat Selvamanickam (University of Houston, USA)

Europe/Zurich
31/3-004 - IT Amphitheatre (CERN)

31/3-004 - IT Amphitheatre

CERN

105
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Description

The ultra-high critical magnetic fields of REBa2Cu3Ox (REBCO RE=rare earth) High temperature superconductors (HTS) provide the opportunity for superconducting magnets that can operate well above 20 T. The challenge had been in developing these brittle ceramic materials in lengths of over a kilometer on flexible substrates with properties similar to that of high quality epitaxial thin films. Novel materials processing has been developed to fabricate HTS tapes with excellent critical current performance by manipulation of grain orientations and nanoscale defects. HTS tapes are now being manufactured in piece lengths of a kilometer with engineering current densities above 300 A/mm2 at 77 K, 0 T. In the past few years, tremendous advancements have occurred in nanoscale defect engineering in these thin film HTS tapes that has led to a quadrupling of critical current performance in high magnetic fields and operating temperatures of interest for various applications. REBCO tapes have been fabricated with a high density of nanoscale defects with zirconium addition up to 25 mol% with excellent properties in magnetic fields of 2 – 30 T over a temperature range of 4.2 K to 77 K. Critical current densities exceeding 20 MA/cm2 have been achieved at 30 K, 3 T (field perpendicular to tape) and pinning forces over 1000 GN/m3 have been attained at 20 K. Combining these heavily-doped REBCO with thicker films, engineering current densities above 2200 A/mm2 have been demonstrated at 4.2 K in 15 T field oriented perpendicular to the tape plane, which is twice and thrice respectively better than the performance levels of Nb3Sn and Bi-2212 wires at this field. An overview of the development of high performance REBCO superconductor tapes for high field magnet applications will be presented.

 

 

ATS Seminars Organisers: H. Burkhardt (BE), M. Modena (TE), T. Stora (EN)


Coffee / tea will be served before the seminar at 3:30 in room 31-3-009