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To reduce the running cost of a superconducting quantum interference device biomagnetic measurement system, a closed-cycle helium re-condensing system using a single pulse-tube cryocooler was developed. The pulse-tube cryocooler was magnetically less noisy and more efficient than conventional Gifford-McMahon cryocoolers. The rate of re-condensing helium was 14.4 L/day with a power consumption of less...
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