A ³He pulse tube cooler operating down to 1.3 K

详细信息	查看全文 | 推荐本文 |

• 作者：Jiang ; N. ; Lindemann ; U. ; Giebeler ; F. ; Thummes ; G.
• 关键词：Pulse tube (E) ; Helium-3 (B) ; Staging method
• 刊名：Cryogenics
• 出版年：2004
• 期刊代码：45_00112275
• 类别：et
• 出版时间：November, 2004
• 卷：44
• 期：11
• 页码：809-816
• 文件大小：529 K

摘要

Regenerative cryocoolers that employ ⁴He as working fluid can only reach a lowest temperature of about 2 K. This limitation can be overcome by the use of ³He as working fluid. Here we report on the performance of a two-stage pulse tube cooler that consists of two parallel stages with independent gas circuits. The pressure oscillation in each stage is generated by means of a separate compressor in combination with a rotary valve. With ⁴He in both stages, the minimum no-load temperature of the 2nd stage was 2.23 K, and cooling powers of 50 W at 53 K and 380 mW at 4.2 K were simultaneously available at electrical input powers of 4.54 and 1.45 kW to the 1st and 2nd stage, respectively. Using ³He as working fluid in the 2nd stage, a minimum stationary temperature of 1.27 K has been achieved, which is, up to now, the lowest temperature obtained by regenerative cryocoolers. At an electrical input power of 1.3 kW, the 2nd stage provides a cooling power of 42 mW at 2.0 K and 518 mW at 4.2 K. With ³He, at the same operating condition, the cooling power at 4.2 K was found to be larger than with ⁴He.