Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 12: Symposium “Coated HTS Conductors”

TT 12.6: Talk

Tuesday, March 27, 2007, 11:15–11:30, H20

Nexans Advances in all CSD Route for REBCO Coated Conductors — Joachim Bock, Juergen Ehrenberg, Bernhard Hoppe, Dirk Isfort, Marcel Klein, and •Mark Rikel — Nexans SuperConductors, Chemiepark Knapsack, Huerth 50351, Germany

Development of REBCO coated conductors (CC) at Nexans SuperConductors (NSC) is focused on all chemical solution deposition (CSD) route that promises the best performance-to-price ratio in long lengths. The feasibility of all CSD approach is shown on the lab scale: using metalorganic deposition (MOD), NSC was able to produce YBCO/CeO₂/LZO/NiW CCs with J_c(77 K, sf) = 0.5 MA/cm². The major advance of NSC on a semi-industrial scale is the use of MOD route for production of high-quality La₂Zr₂O₇ (LZO) coated NiW RABITS in lengths up to 12 m. With those substrates, it is possible to produce CCs with the simplest (one-buffer) architecture by depositing REBCO using other techniques (ISD at Theva, Ismaning; MOCVD at IOT, Braunschweig; HLPE at University of Cambridge, UK). The best short sample I_c = 280, 120 and 100 A/cm-width for HLPE, ISD, and MOCVD, respectively First long-length conductors show transport I_c = 40 A (10m-long, ISD). Further work is focused on optimisation of the already established mixed (MOD+PVD) approaches, understanding optimum architecture and processing conditions for the all-CSD route and developing tools for scaling those conditions to long-length production.

The work is supported in part by BMBF (SupraNanoSol, ForOxid) and EU (HiperChem, Super3C).