High-temperature superconducting striated tape

Combination of two high-temperature superconducting tapes forms wire suitable for alternating current applications

Materials Electronics

A step-by-step diagram of the low AC-loss HTS cable fabrication process. Step #2 is performed on a separate fixture.

Scientists at the Naval Research Laboratory have recently invented a method of making a high-temperature superconducting (HTS) striated tape, which is essentially a kind of wire that has zero resistance below a certain temperature. The patented technology is available via patent license agreement to companies that would make, use, or sell it commercially.

Certain materials exhibit superconductivity, meaning that below a characteristic critical temperature, their electrical resistance drops to zero. Wires made of high-temperature superconductors are those that can operate at a higher critical temperature than usual. They usually consist of flat metal tapes coated with thin layers of high-temperature superconducting material. However, the flat geometry causes significant losses in alternating current (AC) applications.

Navy researchers have developed an efficient and scalable method of creating high-temperature superconducting striated tape, which does not suffer from the same losses in AC applications. The tape is made by aligning and bonding two superimposed high-temperature superconducting tapes to form a single integrated tape structure. The process aligns the two tapes on either side of a thin, intervening insulator layer with microscopic precision, and electrically connects the two sets of tape filaments with each other.

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