30 June, 2011

A method developed by researchers at the National Institute of Standards and Technology (NIST) and the University of Colorado at Boulder for making thin, flexible, high-temperature superconducting (HTS) cables has won a 2011 R&D 100 Award.

Designed to operate at -196° C (-353° F), the new superconducting cable has a diameter of less than 1 centimeter and is able to carry 2,800 amperes of current-three times as much as thicker, conventional copper or aluminum electrical transmission lines.

The cables are constructed by winding multiple HTS-coated conductors around a multi-strand copper core. The superconducting layers are wound in spirals in alternating directions.

According to developer Danko van der Laan, a University of Colorado scientist working at NIST, the main innovation in the compact cables is the tolerance of newer HTS conductors to compressive strain that allows use of the unusually slender copper core.

Besides power transmission, cables constructed using this invention could be used for superconducting transformers, generators and magnetic energy storage devices that require high-current windings. The compact cables also could be used in high-field magnets for fusion and high-energy physics research and for medical applications such as proton-accelerator cancer treatment systems and magnetic resonance imaging.