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The Principles of Thermodynamics
book

The Principles of Thermodynamics

by N.D. Hari Dass
October 2013
Intermediate to advanced content levelIntermediate to advanced
352 pages
13h 56m
English
CRC Press
Content preview from The Principles of Thermodynamics
Approach to Absolute Zero 285
Hence the cooling power of dilution refrigerators goes down only quadratically
with temperature. In the cryostat, the latent heat was practically insensitive to tem-
perature, whereas in the dilution case it is ˙n
3
that is insensitive. A comparison of the
cooling rates for the same, but otherwise arbitrary, He3 pumping rate is shown in
gure 14.3.
As can easily be gathered from this, dilution refrigeration is far superrior to even
the He3 cryostat. The latter, as already remarked, becomes totally inefcient below
about 0.2 K. The dilution refrigeration, on the other hand, can cool objects to a few
mK. In the next section, ...
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Publisher Resources

ISBN: 9781466512085