Regenerative expansion apparatus, pulse tube cryogenic cooler, magnetic resonance imaging apparatus, nuclear magnetic resonance apparatus, superconducting quantum interference device flux meter, and magnetic shielding method of the regenerative expansion apparatus
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United States of America Patent
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Dec 6, 2011
Grant Date -
Dec 10, 2009
app pub date -
Apr 29, 2009
filing date -
Jun 9, 2008
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Abstract
A regenerative expansion apparatus includes a regenerative tube configured to regenerate cryogenic cooling at the time of expansion of a coolant gas; a cylinder in communication with a low temperature end of the regenerative tube, the cylinder being configured to generate the cryogenic cooling by repeating compression and expansion of the coolant gas via the regenerative tube; a magnetic cold storage material filling inside the regenerative tube, the magnetic cold storage material being made of a magnetic material, the magnetic cold storage material being configured to come in contact with the coolant gas so that the cryogenic cooling is regenerated; and a magnetic shield member surrounding the magnetic cold storage material; wherein the magnetic shield member has an electric resistivity equal to or less than 50 μΩcm at a normal temperature.
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