Abstract
Most devices refrigerated to below 20°K are provided with radiation shielding at some higher temperature, say 77°K, to intercept the radiation heat load from normally room-temperature bounding surfaces, and the refrigeration required at the radiation shield is generally many times that required at the lower temperatures. This is, of course, the reason for using a shield. In many applications, such as cryopumped space simulation chambers or helium liquefiera, the refrigeration for the radiation shield is provided by a liquid-nitrogen phase change.
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References
E. F. Yendall, in Advances in Cryogenic Engineering, Vol. 2, Plenum Press, New York (1960), p. 188.
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© 1964 Springer Science+Business Media New York
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Chellis, F.F., Hogan, W.H. (1964). A Liquid-Nitrogen-Operated Refrigerator for Temperatures Below 77°K. In: Timmerhaus, K.D. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 9. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0525-6_66
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DOI: https://doi.org/10.1007/978-1-4757-0525-6_66
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