大出力4バルブ型パルス管冷凍機の開発
1998 年 33 巻 4 号 p. 183-188
詳細
1998 年 33 巻 4 号 p. 183-188
A single-stage four-valve pulse tube cryocooler with a large cooling power at 80K has been built and tested. The cryocooler has a regenerator stacked with stainless-steel screen disks of 250 mesh and a pulse tube 200mm long. A rotary valve unit directly united to the hot end of the cold head is employed to control the mass flow at the hot ends of the regenerator and pulse tube. Three kinds of pulse tube, 18, 28 and 38mm in diameter, were prepared for investigating the influence of pulse tube size on cooling performance. The cryocooler with the pulse tube of 28mm in diameter delivered a cooling power of 33.5W at 80K, and reached a no-load temperature of 20.5K at a cycle frequency of 1.8Hz. This paper gives the initial experimental results and a brief discussion.
