Performance improvement of a two-stage GM cryocooler by use of Er(Ni0.075Co0.925)2 magnetic regenerator material
✍ Scribed by L Trevisani; T Kuriyama; F Negrini; T Okamura; Y Ohtani; M Okamura; M Fabbri
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 357 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
A newly developed magnetic regenerator material Er(Ni 0:075 Co 0:925 ) 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(Ni 0:075 Co 0:925 ) 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.