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Operation of a geophysical HTS SQUID system in sub-Arctic environments

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11 Author(s)
Leslie, K.E. ; Telecommun. & Ind. Phys., CSIRO, Lindfield, NSW, Australia ; Binks, R.A. ; Foley, C.P. ; Thorn, R.G.
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Transient ElectroMagnetic geophysical prospecting using SQUID sensors has demonstrated potential for improved target detection at late response times compared to conventional coil sensors. We have developed a three-axis, rf SQUID sensor system which has been extensively operated in sub-Arctic conditions by a geophysics contractor. Due to the harsh environmental and operating conditions, the system is designed to operate in sub-zero temperatures (as low as minus 40°C) and is ruggedly packaged whilst still remaining quite portable. Auto-tuning of the rf electronics has been implemented by adjusting the rf SQUID control parameters via a microprocessor controller. After a small amount of training, regular field crews have operated two of these systems in the field continuously for periods of months at a time. An example, comparing SQUID B field data to coil dB/dt data, is presented in this paper.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )