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Thin-film HTS probe coils for magnetic-resonance imaging

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4 Author(s)
Withers, R.S. ; Conductus Inc., Sunnyvale, CA, USA ; Liang, G.-C. ; Cole, B.F. ; Johansson, M.

Several planar coil designs, with integral resonating capacitors, are reported using large-area sputtered YBCO films. One design utilizes a distributed interdigital capacitor, while a second exploits capacitive coupling of two films on opposite sides of a dielectric. Devices of the first design made on LaAlO/sub 3/ have achieved Q>10/sup 4/ at 18.5 MHz, possibly limited by the loss tangent of this substrate. Identical coils made with silver films have Q=10. With the second design, Q>10/sup 4/ was achieved at the even lower frequency of 5.7 MHz.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 1 )