Apparatus and method to reduce the thermal response of SQUID sen

Details Apparatus and method to reduce the thermal response of SQUID sen Apparatus and method to reduce the thermal response of SQUID sen

1984-11-13

1987-08-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

307306, G01R 3302, H03K 338

Patent

active

046895590

ABSTRACT:
A SQUID, nominally of the "hybrid" type, wherein the normally superconducting modulation coil is modified to instead be a non-superconducting material, nominally manginin, exhibits reduced long-term, or d.c., thermal response. When an alternating current waveform--rising to a nominal 130 ma. r.m.s. amplitude within a nominal 0.5 seconds and, after a nominal 100 msec. to 20 sec. duration, returning to 0 within a nominal 0.1 sec--is applied to the non-superconducting modulation coil of such a SQUID at superconducting temperature then the entire SQUID thermal response, particularly including the short-term, or a.c., SQUID thermal response, is thereafter reducible to essentially 0. The process is hypothesized to "deflux" the SQUIDs of fluxons trapped during the cool-down of superconductor within the SQUID and associated circuitry. The optimal "de-fluxing" alternating current waveform for any individual SQUID is empirically derivable. Once "de-fluxed" a SQUID maintains a uniformly reduced thermal response for so long as it remains superconducting. SQUIDs may be repetitively initialized/reinitialized by "defluxing" without damage to the SQUID or diminishment of the effective reduction/elimination of thermal response.

REFERENCES:
patent: 4585999 (1986-04-01), Hilbert et al.
Ketchen et al., "Thin-Film DC SQUID Gradiometer", IEEE Trans. on Magnetics, vol. Mag 13, No. 1, Jan./1977, pp. 372-374.

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