Progress in the Continuous Depostition of YBCO Coated Conductors by Thermal Co-Evaporation |
| Journal |
Advances in Science and Technology (Volume 47) |
| Volume |
Science and Engineering of Novel Superconductors V |
| Edited by |
P. VINCENZINI and A. RIGAMONTI |
| Pages |
17-24 |
| DOI |
10.4028/www.scientific.net/AST.47.17 |
| Online since |
October, 2006 |
| Authors |
E. Gilioli,
Andrea Gauzzi,
Massimiliano Bindi,
S. Rampino,
F. Pattini,
F. Bissoli,
Stefano Ginocchio,
M. Baldini,
Sergio Zannella
|
| Keywords |
Coated Conductor, Thermal Co-Evaporation, YBCO |
| Abstract |
We report on recent progress towards the continuous deposition of YBCO Coated
Conductors (CC) by thermal co-evaporation. This is an attractive vacuum technique thanks to the
simplicity, low cost and intrinsic uniformity over large areas. Recently, we published the in situ
preparation route of 1 μm thick superconducting YBCO films deposited onto CeO2 buffered Ni
biaxially textured tapes using a reel-to-reel system; end-to-end critical current densities Jc's at 77 K
and self-field, measured by transport measurements are in the 1-2 MA/cm2 range for 1 m. long
samples, with zero-resistance Tc= 87 K and transition widths DTc<3 K.
In spite of the very good CC’s performances reported by a number of laboratories all over the
world, several steps must be optimized in order to limit the CC production costs, in particular
concerning the complexity of the CC architecture and the choice and optimization of the YBCO
deposition technique.
We specifically address the following critical points regarding: 1) the in situ oxidation of the YBCO
layer using a novel supersonic nozzle, 2) the deposition by thermal or e-beam evaporation of thick
crack-free CeO2 buffer layers and 3) the scaling-up of the deposition process using a new multichamber
system. |
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