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Investigation of the 2nd stage regenerator materials of a Gifford-McMahon cryocooler

大島商船高等専門学校紀要 Volume 43 Page 35-39
published_at 2010-12
OS10043000006.pdf
[fulltext] 903 KB
Title
Gifford-McMahon冷凍機の2段目蓄冷材の検討
Investigation of the 2nd stage regenerator materials of a Gifford-McMahon cryocooler
Creators Fukuda Yusuke
Creators Tamura Kota
Creators Masuyama shinji
Source Identifiers
Creator Keywords
G-M cryocooler Gd2O2S(GOS) stainless steel meshes empty space
The purpose of this study is improving the cooling power at 4.2 K of a two-stage Gifford-McMahon (G-M) cryocooler. We take notice of a specific heat of the 2nd stage regenerator materials. The experiments have been conducted from two ways. Firstly, the lead (Pb), HoCu2 and Gd2O2S (GOS) spheres were used as the 2nd stage regenerator materials. The sphere diameter of Pb, HoCu2 and GOS are 0.4, 0.2 and 0.25 mm, respectively. Their materials were filled in the 2nd stage regenerator as a three-layer structure. Secondly, the Pb spheres were replaced to the stainless steel (SUS) screens (200 mesh) or empty space (Emp). A conventional two-stage G-M cryocooler with an air cooled compressor of 1.3 kW at 60 Hz has been tested. The operating frequency of the G-M cryocooler is 1.2 Hz. From a experimental results, the cooling power of 0.22 W achieved when the volumetric ratio was Pb:HoCu2:GOS = 40:35:25 %.Next, the Pb spheres were replaced to the SUS screens or Emp. The
cooling power were 0.12 W (SUS:HoCu2 = 20:80) and 0.14 W (Emp: HoCu2 = 20:80) at 4.2 K. The empty space brought the higher cooling power than the stainless steel screens.
Languages jpn
Resource Type departmental bulletin paper
Publishers 大島商船高等専門学校
Date Issued 2010-12
File Version Version of Record
Access Rights open access
Relations
[ISSN]0387-9232
[NCID]AN00031668