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SQUID operation with ferromagnetic core superconducting dc transformers

✍ Scribed by M. Cerdonio; G.L. Romani; S. Pace

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
656 KB
Volume
15
Category
Article
ISSN
0011-2275

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✦ Synopsis

We successfully used ferromagnetic core ( Cryoperm 1 O) superconducting transformers to enhance the transfer of external magnetic flux to a symmetric two-holes rf biased quantum interference device (SQUID). The flux transfer ratio has been enhanced up to a factor of ten in comparison with air core superconducting transformers. It has been observed that the presence of ferromagnetic cores in the holes of the SQUID does not introduce additional noise, while it introduces a reduction in the Q of the 19 MHz tank circuit.

The experimental results are discussed in the framework of a detailed analysis of the behaviour of the complete SQUID plus tank circuit plus ferromagnetic core superconducting transformer circuit.

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