Hollister, Matthew I. and Woodcraft, Adam L. (2009) Proposed designs for a “dry” dilution refrigerator with a 1 K condenser. Cryogenics, 49 (7). pp. 371-375. ISSN 0011-2275 http://resolver.caltech.edu/CaltechAUTHORS:20090902-114740324
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Recent development of “dry” dilution refrigerators has used mechanical cryocoolers and Joule–Thomson expansion stages to cool and liquefy the circulating ^3He. While this approach has been highly successful, we propose three alternative designs that use independently-cooled condensers. In the first, the circulating helium is precooled by a mechanical cooler, and liquified by self-contained ^4He sorption coolers. In the second, the helium is liquefied by a closed-cycle, continuous flow ^4He refrigerator operating from a room temperature pump. Finally, the third scheme uses a separate ^4He Joule–Thomson stage to cool the ^3He condenser. The condensers in all these schemes are analogous to the “1-K pot” in a conventional dilution refrigerator. Such an approach would be advantageous in certain applications, such as instrumentation for astronomy and particle physics experiment, where a thermal stage at approximately 1 K would allow an alternative heat sink to the still for electronics and radiation shielding, or quantum computer research where a large number of coaxial cables must be heat sunk in the cryostat. Furthermore, the behaviour of such a refrigerator is simplified due to the separation of the condenser stage from the dilution circuit, removing the complex interaction between the 4-K, Joule–Thomson, still and mixing chamber stages found in current dry DR designs.
|Additional Information:||© 2009 Elsevier Ltd. All rights reserved..Received 9 April 2008. Received in revised form 28 January 2009. Accepted 11 March 2009. The authors would like to thank Simon Chase of Chase Cryogenics for useful information regarding the design of 4He sorption refrigerators. MIH is supported by a Research Studentship from the UK Science and Technology Facilities Council.|
|Subject Keywords:||E. Dilution; E. Pulse tube; E. Sorption coolers; E. Joule–Thomson coolers|
|Official Citation:||Matthew I. Hollister, Adam L. Woodcraft, Proposed designs for a 'dry' dilution refrigerator with a 1 K condenser, Cryogenics, Volume 49, Issue 7, July 2009, Pages 371-375, ISSN 0011-2275, DOI: 10.1016/j.cryogenics.2009.03.002. (http://www.sciencedirect.com/science/article/B6TWR-4VW556K-2/2/8b65050b678e37f5a5e7be094fa6aded)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||03 Sep 2009 17:09|
|Last Modified:||26 Dec 2012 11:18|
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