Abstract
A new class of alloys has been developed at Ames Laboratory in Ames, Iowa. These alloys exhibit heat capacities that exceed those of all other materials, including lead, over a wide range in temperature (15 K<T<85 K). An effort is underway to employ these alloys in a two-stage pulse tube cooler driven by a linear compressor to achieve cooling at 20 K. The first stage of the cooler will have the conventional stainless steel screen regenerator matrix. The matrix for the second stage regenerator (<60 K) will be made from the newly developed alloys. The performance of one such alloy is being tested in an apparatus that consists of a single-stage pulse tube cooler pre-cooled by a liquid nitrogen stage. The regenerator material used in the tests is in spherical powder from having particle sizes ranging from 90 μm to 106 μm. Preliminary results from tests performed in the pulse tube cooler employing the new regenerator material are presented.
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