NDLI: Improved design of an optically switched inductance modulation circuit for noise reduction in SQUID systems

Content Provider	IEEE Xplore Digital Library
Author	Park, G.S. Sae Woo Nam Cabrera, B. Huber, M.E.
Copyright Year	2002
Abstract	We have modeled and optimized the design of an optically driven inductance modulation circuit, for use as part of a 1/f noise reduction scheme for SQUID magnetometers. We modulate the effective inductance of a photolithographically patterned coil via its mutual inductance with three concentric superconducting washers directly above the coil. The superconducting loops formed by each of these washers can be broken by sending laser light onto a constricted meander section of each of these washers. With the laser off, the superconducting washer loops diamagnetically shield the coil, and the coil has a low effective inductance. With the laser on, the meanders are driven normal and the superconducting washer loops are open, greatly reducing the shielding. The coil then has a high effective inductance. In a series of computational runs, we have optimized the design of this circuit in terms of its inductance modulation depth and its avoidance of flux jumping incidents. The free parameters in this study were the inner diameter of the coil, the number of loops in the coil, the dimensions of the three washers, and the size of the overlaps between washers.<>
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3214
Ending Page	3217
Page Count	4
File Size	404687
File Format	PDF
ISSN	10518223
Volume Number	5
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical modulation Optical design Optical noise Switching circuits Inductance Noise reduction SQUIDs Superconducting coils Design optimization Superconducting device noise
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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