What Is REBCO Superconductor?
A REBCO superconductor is a rare-earth barium copper oxide material that carries electric current with no DC resistance when it is below its critical temperature, current, and magnetic-field limits. The material is usually made as thin, layered tape on a strong metal substrate. Its engineering value comes from high critical current density, often expressed as J_c = I_c / A, where current is divided by superconducting cross-section.
In real magnets, REBCO tape must be wound, insulated, cooled, and mechanically supported against large Lorentz forces. It can operate at higher temperatures and stronger magnetic fields than many low-temperature superconductors, which reduces cryogenic burden and enables smaller magnet systems. In high-field fusion magnet design, those properties can shrink the plasma confinement volume required for useful performance.
The material matters because magnetic-field strength often controls machine size, energy density, and efficiency in advanced devices. Used in devices include fusion magnets, compact particle accelerators, high-field MRI research systems, motors, generators, and fault-current limiters. Practical design still depends on quench protection, tape uniformity, joint resistance, mechanical strain limits under operating load, and reliable cooling during changing magnetic conditions.
Example:
A compact fusion magnet can use stacked REBCO tape to carry large current while operating in a magnetic field above 20 tesla.
Related Terms:
- Plasma Confinement
- Stellarator
- Superconducting Magnet
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