4 K Gifford-McMahon 冷凍機の温度振動平滑化に関する研究

概要

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The purpose of this study is to smooth temperature oscillation of a 4 K Gifford-McMahon(G-M) refrigerator. A cold-head of G-M refrigerators have temperature oscillation becauseof reciprocating of a displacer. In particular, the phenomenon becomes large bellow 15 Klevel. The reason is that specific heat of regenerator materials generally decrease withdecreasing temperature. The tested two-stage G-M refrigerator has temperatureoscillation of 0.33 K (peak to peak value) at 4 K (middle value of temperature oscillation).To smooth temperature oscillation of a cold-stage, we carry out by a simple method:Sandwiching a suitable material between a cold-stage and a cold-head allows smoothingtemperature oscillation at the cold stage. In this research, a stainless plate is sandwiched.When using a stainless steel plate of 2 mm thickness, temperature oscillation of thecold-stage is reduced to 0.06 K at 4 K. The result is in good agreement with the calculatedvalue.
大島商船高等専門学校の論文
2007-12-01