A Helium3 Refrigerator
Temperatures in the neighborhood of 1.25°K are conveniently obtained by reducing the pressure on a liquid He4 bath in an appropriate dewar system. Below this temperature. the vapor pressure of the saturated liquid is so small that limitations on lowering the temperature are imposed by a rapid decrease in the pumping speed of the vacuum pumps. For He3 the vapor pressure for a given temperature is much larger than for He4 and will enable one to obtain temperatures in the neighborhood of 0.35°K.
KeywordsVapor Pressure Data Saturated Liquid Density Ultimate Temperature Mercury Diffusion Evaporator Pressure
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- 4.J. Daunt et al., Phys. Rev., Vol. 110. 282 (1958).Google Scholar