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Pushing Coated Conductor Critical Currents Beyond 1 kA per cm Width: Stacks of YBCO Layers
Yehyun Jung,Sheehan, C J,Coulter, J Y,Matias, V,Dojun Youm IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>For a number of superconducting power applications, a high value of the engineering critical current density (<I>Je</I>) for the wire is crucial. The superconducting layer in the coated conductor is typically a small portion of the overall cross-section, so increasing the superconductor fraction will directly result in an increase of <I>Je</I> . However, as the thickness of the superconductor is increased, <I>Jc</I> eventually drops. We describe a way to increase <I>Je</I> by making a stack of superconducting layers using sequential Ion-Beam Assisted Deposition (IBAD)/Superconductor deposition. Reactive Co-Evaporation by Cyclic Deposition and Reaction (RCE-CDR) is used for superconductor. An IBAD-textured layer resets the crystalline structure after each superconducting layer and we use IBAD-MgO for this purpose. However, IBAD-MgO texturing requires an extremely smooth starting surface (about 1 nm root mean square roughness), whereas the YBCO layer is typically 10-100 times rougher. We employ the Solution Deposition Planarization (SDP) process to planarize the rough surface of YBCO. The SDP layer is insulating and it provides for an easy way to separate the superconducting layers electrically. We discuss unique features of the stacking structure that allow for high <I>I</I><SUB>c</SUB>, low ac-losses in applied fields, as well as high <I>Je</I> .</P>
Reactive Co-Evaporation of YBCO for Coated Conductors
Matias, V.,Hanisch, J.,Sheehan, C.,Ugurlu, O.,Storer, J. The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.4
We describe methods for depositing high temperature superconducting films on textured metal tapes by reactive co-evaporation (RCE). We discuss how RCE can be used to deposit on moving tape in a continuous fashion in a Garching-style process. Results are presented on films deposited by RCE at Los Alamos on IBAD-MgO textured tapes. The performance achieved, attaining over 500A/cm-width in self-field at 75.5 K, is competitive with the best results obtained by other processes for coated conductors. Tape production throughput is critical for the economics of the process and high deposition rates achieved in RCE are attractive for this. We present a detailed cost analysis model for HTS deposition using an RCE Garching process. The results indicate that HTS deposition can cost $<$5/kA{\cdot}m$ in a scaled up manufacturing environment.