Patent ID: 7434408
Filing Date: 2008-10-14
Classification: F25B,F25D

Abstract:
1. A method for cryocooling a vibration-sensitive article using a regenerative cryocooler, comprising the steps of: providing a regenerative cryocooler having at least two pairs of cooling cylinders being arranged on and connected to a single main surface of a cold end of the cryocooler, the two pairs of cooling cylinders comprised of four cooling cylinders having the same diameter and the same length and arranged parallel to each other, the two pairs of cooling cylinders are arranged such that the two cooling cylinders of each pair are placed opposite to each other behind a center of the main surface of the cold end, and a diagonal line connecting one pair of cooling cylinders is orthogonal to another diagonal line connecting the other pair of cooling cylinders, and the two cooling cylinders of each one pair are comprised of a pulse tube and a regenerator, the cryocooler cyclically supplying a high pressure gas to the one pair of cooling cylinders and a low pressure gas to the other pair of cooling cylinders, the two pairs of cooling cylinders presenting a pressure phase-shift with respect to one another, so that the cold end is forced to deform at two portions connected to the one pair of cooling cylinders by an extension of the one pair of cooling cylinders with the high pressure gas to an elongating direction of the cooling cylinders, while the cold end is forced to deform at another two portions connected to the other pair of cooling cylinders by a contraction of the other pair of cooling cylinders with the low pressure gas to the opposite elongating direction of the cooling cylinders, to establish a vibration-free portion on the main surface of the cold end of the cryocooler; and mounting the vibration-sensitive article onto a mounting pedestal placed to the vibration-free portion of the cold end.