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Performance improvement of a two-stage GM cryocooler by use of Er(Ni0.075Co0.925)2 magnetic regenerator material |
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| Authors: | L TrevisaniT Kuriyama F NegriniT Okamura Y OhtaniM Okamura M Fabbri |
| Affiliation: | a Department of Electrical Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy b Power & Industrial Systems Research and Development Center, Toshiba Corporation, Yokohama 230-0045, Japan c Department of Energy Sciences, Tokyo Institute of Technology, Yokohama 226-8502, Japan d Material and Components Development Department, Toshiba Corporation, Yokohama 235-0032, Japan |
| Abstract: | A newly developed magnetic regenerator material Er(Ni0.075Co0.925)2, having high specific heat at temperatures from 10 to 20 K, has been tested inside the second regenerator of a two-stage GM cryocooler. Different working conditions have been examined: four Er(Ni0.075Co0.925)2/Pb material ratios, three displacer reciprocating speeds, and two cryocooler stroke lengths. In the best working conditions, the experimental results show a cooling power improvement up to 15% over the whole temperature range from 10 to 20 K compared to that of the same GM cryocooler employing only lead. |
| Keywords: | GM cryocooler Regenerator Magnetic regenerator material |
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