Even with hypothetical very high temperature superconductors we still want to run cryogenics to push the critical current higher. At some point mechanical stre

Even with hypothetical very high temperature superconductors we still want to run cryogenics to push the critical current higher. At some point mechanical stress would be the limiting factor but there is no path towards discovering such a miracle material. If one were to be discovered it would revolutionize our world. For the foreseeable, we use HTS materials, that can superconduct at LN2 temperatures, with helium.