High Critical Temperature Superconducting Wire Based Flux Transformers

• Published in: IEEE transactions on applied superconductivity Vol. 19; no. 3; pp. 761 - 763
• Main Authors: Dyvorne, H., Guerrero, R., Fermon, C., Pannetier-Lecoeur, M., Jacquinot, J.-F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Construction; Couplings; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Flux; FLUXES; High-temperature superconductors; magnetic field sensitivity; Magnetometers; Materials; NOISE; resonant circuit; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal detection; SQUID magnetometers; Superconducting device noise; Superconducting devices; Superconducting filaments and wires; Superconducting materials; Superconducting thin films; SUPERCONDUCTIVITY; SUPERCONDUCTORS; Temperature sensors; THIN FILMS; Tin; TRANSFORMERS; Transformers and inductors; Transition temperature (superconductivity); Various equipment and components; WIRE; Electric transformer; Magnetic flux; High-temperature superconductors; Magnetometers; Transfer characteristic; Resonant circuit; Superconducting wires; Thin film; Integrated circuit bonding; High sensitivity; Soldered joint; Superconducting quantum interferometer device; magnetic field sensitivity; Critical temperature; Flux transfer; Magnetic field; Signal detection; High temperature superconductor; Low temperature; Magnetic properties
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2009.2018539

Flux transformers are currently used for signal detection with high sensitivity magnetometers like SQUIDS , as an alternative to direct coupling between the magnetometer and the sample. To avoid extra noise, most of them are made of superconducting material, namely low critical temperature (Tc) wires and high Tc thin films. We build flux transformers with high Tc Bi-2223 commercial wires operating at 77 K. Because the loops are closed by tin soldering, the device has a residual resistance of a few muOmega . We present the magnetic flux transfer characteristics and the calculations of the noise induced in the detection chain by this kind of flux transformer in two configurations: the untuned flux transformer and the tuned flux transformer.