Thin-film HTS probe coils for magnetic-resonance imaging

Author

Withers, R.S. ; Liang, G.-C. ; Cole, B.F. ; Johansson, M.

Author_Institution

Conductus Inc., Sunnyvale, CA, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2450

Lastpage

2453

Abstract

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.<>

Keywords

Q-factor; barium compounds; biomedical NMR; biomedical electronics; biomedical equipment; coils; high-temperature superconductors; probes; superconducting magnets; superconducting thin films; thin film devices; yttrium compounds; 18.5 MHz; 5.7 MHz; LaAlO/sub 3/; MRI; YBa/sub 2/Cu/sub 3/O/sub 7/-LaAlO/sub 3/; capacitive coupling; distributed interdigital capacitor; integral resonating capacitors; large area sputtered films; loss tangent; magnetic-resonance imaging; planar coil designs; probe coils; Capacitors; Coils; Dielectric substrates; Dielectric thin films; High temperature superconductors; Magnetic films; Probes; Silver; Sputtering; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233951

Filename

233951