30 mm Wide IBAD-MgO REBCO Coated Conductors Developed at the KC ⁴ Facility

In this paper we report on a novel HTS coated conductor developed at the KIT-CERN Collaboration on Coated Conductors (KC<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup>) facility at the Institute of Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Germany, namely the first-ever 30 mm wide coated conductor on IBAD-MgO, which was provided by iBeam Materials. These samples are highly homogenous with self-field <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">J</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> values at 77 K and 30 K of 1.0 MA/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and 6.6 MA/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> respectively. We will briefly introduce the KC<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> facility, which is a pilot production coated conductor R&D laboratory, established for material development to bridge the gap between research and manufacturing and to transfer small-scale PLD research results to large-scale coated conductors (CCs). Since the completion of the deposition line in 2023, REBCO films have been deposited on long-length metal substrates with various buffer stacks, and reasonably good I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> values of 300 A/cm width at 77 K on 12 mm wide tapes were obtained with the potential for further improvement. Efforts are in progress to upscale the R&D to wider tapes that will open new avenues for the application of CCs in the high-field, low temperature region as well as for special applications.