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ST455 - Development of Magnetic Prospecting System with HTS SQUID Gradiometer for Exploration of Metal Resources

Development of Magnetic Prospecting System with HTS SQUID Gradiometer for Exploration of Metal Resources
 
Akira Tsukamoto1, Tsunehiro Hato1, Seiji Adachi1, Masayuki Motoori2, Masaki Sugisaki2, Keiichi Tanabe1
 
1SRL-ISTEC
Minowa-cho, Kohoku-ku,Yokohama, Kanagawa 223-0051, Japan
 2JOGMEC
Toranomon, Minato-ku, Tokyo 105-0001, Japan
 
 
Abstract — We have developed a magnetic prospecting system with HTS SQUID gradiometers for exploration of metal resources. The SQUID gradiometer consists of a flux transformer chip made of a YBCO thin film and a SQUID gradiometer chip which is stacked on the transformer chip. The SQUID gradiometer chip was fabricated by using an HTS multilayer and ramp-edge junction technology at ISTEC. Their effective volume and the balance estimated by using a Helmholtz coil were approximately 3 x 10-9 m3 and 1/500, resulting in the gradiometric field noise of 7 pT/m/Hz1/2 at 10 Hz. Two assembled SQUID gradiometers, which measure dBz/dx and dBz/dy field gradients, were cooled with liquid nitrogen in a cryostat of the magnetic prospecting system. The cryostat was suspended from the frame of the system and its attitude was self-controlled by gravity. The magnetic prospecting system with the HTS SQUID gradiometers, flux-gate sensors, a GPS module, and a gyro sensor was also tested in a field near an old mine.

Keywords (Index Terms) — HTS-SQUI, gradiometer, mineral exploration, flux transformer.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), July 2015.
Selected August 4, 2015. Reference ST455; Category 4. 
Preprint of contributed paper SQ-O06 presented at ISEC 2015; Nagoya, Japan, July 6 – 9, 2015. 
Final version will be published by IEEE XPLORE.