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A continuous 3He cryostat with pulse-tube precooling and optical access.

Author(s) : BURTON J. C., CLEVE E. van, TABOREK P.

Type of article: Article

Summary

The authors have designed and constructed a continuously operating 3He cryostat with windows for laser ablation and spectroscopy. A two-stage pulse-tube refrigerator cools two platforms to base temperatures of approximately 40 and 4 K respectively. The platforms are equipped with heat exchangers that cool separate streams of 4He and 3He. The 4He stream is used to run a thermally isolated evaporative refrigerator with a base temperature of approximately 1.5 K and a cooling power of 20 mW. The 4He refrigerator is used to condense 3He, which is used to run a 3He evaporative refrigerator on the experimental cell. The cryostat runs continuously at temperatures from 10 K to 0.4 K with a cooling power of 1.5 mW at 0.5 K. [Reprinted with permission from Elsevier. Copyright, 2011].

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