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Magnet applications of coated conductors (high temperature superconductor wires)

Coated conductors are becoming available in sufficient lengths for insert coils, shieldings and current leads for electro-magnets. The project addresses the technical problems arising from the use of the new material.

High temperature superconductor (HTS) tape is an extremely promising new material for superconducting electro-magnets for research laboratories, accelerators and medicine technology. For the first time, coated conductors (CC), i.e. thin HTS coatings on flexible metal tape, are becoming available in sufficient length and with high critical currents. This project shall lay the foundation for the use of this new material for future high field magnets. There are two major benefits of the new CC material: 1) high transport currents but very low heat conduction, and 2) high critical current densities even in the presence of high magnetic fields, which limit the performance of conventional superconductors like NbTi, Nb3Sn or HTS wire made of BSCCO. This offers the potential to use CC for current leads with low heat leakage into the cryogenic part of the magnet and for insert coils to enhance the magnetic field, which can be generated in a certain volume. The project addresses both tasks. In close collaboration THEVA will develop and optimize CC material for current leads and coils to be tested and implemented in magnet systems by RTI - a manufacturer of research magnets up to 19 ton. THEVA has developed a proprietary technology to use Hastelloy C276, a special high temperature steel as metal substrate for the CC tape. Due to its extremely low heat conductivity the heat leakage rate into the helium bath of the magnet can be reduced by nearly two orders of magnitude - from currently several 100 mW (megawatt) to below 10 mW per pair. Hence, the helium consumption can be drastically reduced. The partners will design and test new concepts for current leads using CC cooled by gas-flow. Another major task of the project is to design and produce an insert coil for an 8T magnet system employing about 100 m of CC. The partners have to address all related technical problems like coil winding using tape material, electrical connections, stabilisation and insulation. The plan is to build a prototype 8T hybrid magnet system to evaluate the CC performance under conditions inherent to a magnet system, i.e. strong magnetic fields, mechanical stress and high voltages generated in quench situations. This prototype will be the first high field magnet using CC in the innermost coil section. The results will be path breaking for the design and construction of future compact, high field magnets. Keywords: magnet.
Acronym: 
HTSMAG
Project ID: 
3 647
Start date: 
01-04-2006
Project Duration: 
21months
Project costs: 
1 000 000.00€
Technological Area: 
Inorganic Chemistry
Market Area: 
Other analytical and scientific instrumentation

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