Abstract

Cryocoolers are devices which produce the required refrigeration at a specific low temperature, and they can replace the normal cryogenic fluids. Cryogenic fluids give refrigeration only at a specific temperature whereas cryocooler can produce refrigeration at varying low temperatures. There are many types of cryocoolers like Pulse tube, Stirling, Joule-Thomson, Gifford-McMahon (GM) etc. Many advances have occurred over the years in these cryocoolers. For obtaining very low temperatures along with large cooling powers GM and Pulse tube cryocoolers are found to be better among the others. Hence, this article focuses the advances in GM cryocoolers. This article discusses the working of GM cryocooler, importance of regenerator material and how one can use special regenerator materials to reach very low temperatures. Further, the advances in these cryocoolers such as the use of Labyrinth finish regenerators to obtain higher cooling powers etc. are also discussed. It is presumed that the reader obtains a basic understanding of the GM cryocooler, latest developments and the possible future areas for research from this article.

Highlights

  • A GM cryocooler is a low frequency device wherein a displacer is made to move within a housing from one location to another

  • For obtaining very low temperatures along with large cooling powers GM and Pulse tube cryocoolers are found to be better among the others

  • This article discusses the working of GM cryocooler, importance of regenerator material and how one can use special regenerator materials to reach very low temperatures

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Summary

Introduction

A GM cryocooler is a low frequency device wherein a displacer is made to move within a housing from one location to another. The working fluid such as Helium is sent into and out of the system at high and low pressures using properly timed inlet and outlet valves respectively. Low temperatures are produced at a specific part of the cryocooler which is known as cold head. Displacer moves away from the lowest position and gas is expelled out through Low pressure valve.

Published under licence by IOP Publishing Ltd
Expander height Temperature oscillation
Spiral labyrinth seal
Conclusion
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