Gifford-McMahon冷凍機の2段目蓄冷材の検討

概要

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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. Theexperiments 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 andGOS are 0.4, 0.2 and 0.25 mm, respectively. Their materials were filled in the 2nd stage regeneratoras 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 cooledcompressor of 1.3 kW at 60 Hz has been tested. The operating frequency of the G-M cryocooler is 1.2Hz. From a experimental results, the cooling power of 0.22 W achieved when the volumetric ratio wasPb:HoCu2:GOS = 40:35:25 %.Next, the Pb spheres were replaced to the SUS screens or Emp. Thecooling power were 0.12 W (SUS:HoCu2 = 20:80) and 0.14 W (Emp: HoCu2 = 20:80) at 4.2 K. Theempty space brought the higher cooling power than the stainless steel screens.
大島商船高等専門学校の論文
2010-12-01