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Title: New Regenerator Materials for use in pulse tube coolers

A two-stage pulse tube cooler driven by a linear compressor is being developed to provide 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 a new class of Er based alloys which was recently developed at Ames Laboratory, in Ames, Iowa. These alloys exhibit heat capacities that exceed that of all other materials, including lead, over a Wide range in temperature (15 K < T C 85 K). The performance of one such alloy was shown to be better than lead when tested in a single-stage pulse tube cooler driven by a G-M compressor and operating at 2 Hz. An effort is underway to establish their suitability at frequencies above 40 IIZ. An approach to testing these alloys at low temperatures while using a low-power linear compressor is presented.
Authors:
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Publication Date:
OSTI Identifier:
832907
Report Number(s):
IS-M 911
TRN: US200430%%988
DOE Contract Number:
W-7405-Eng-82
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 30 Sep 2004
Research Org:
Ames Laboratory, Ames, IA (US)
Sponsoring Org:
USDOE Office of Science (SC) (US)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; AMES LABORATORY; COMPRESSORS; HEAT EXCHANGERS; PERFORMANCE; REGENERATORS; SCREENS; STAINLESS STEELS; TESTING