THEVA developed an all PVD approach for the production of GdBCO based high temperature superconducting wires for a variety of applications. Using our pilot production line in Germany, we can manufacture the wires in long lengths with a critical current of 500 A/cm (77 K, 0 T) and more.
In order to increase the current density for magnet applications, we recently developed a new type of HTS wires with a thinner substrate: 50 µm instead of 100 µm, which was used up to now. The performance on the thinner substrates is already very similar to the one on the 100 µm thick substrates. Additionally, a new PVD plating process was developed in order to apply a very uniform copper or also silver coating. With this very uniform layer, a very well-defined coil winding or stacking of the conductors with very little gaps between the adjacent tapes is possible leading to optimal filling factors. Additionally, PVD plating allows us to optimize the thickness of the coating on the HTS and on the substrate side independently according to customer needs. In order to further improve the wire for magnet applications, THEVA is now testing the applicability of artificial pinning to our technology. First results already show significant improvements in environments below 30 K and above 5 T.
We will give an overview on the wire properties and focus on the most recent results of our developments including a brief overview on projects we are working on at THEVA.