Cold head, superconducting magnet, examination apparatus, and cryopump
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United States of America Patent
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Aug 25, 2020
Grant Date -
Aug 6, 2015
app pub date -
Apr 16, 2015
filing date -
Oct 22, 2012
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Abstract
A reduction in a permeability of refrigerant gas is suppressed while increasing a filling factor of regenerator material particles with respect to a stage of a cold head. A cold head includes a stage including regenerator material particle groups, and a metal mesh material partitioning the regenerator material particle groups. The metal mesh material has quadrangular mesh holes each having a length of a long side of 1/10 or more and ½ or less of each of average particle sizes of the regenerator material particle groups.
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