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Cryocoolers 13 (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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Cryocoolers 13 (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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The last two years have witnessed a continuation in the
breakthrough shift toward pulse tube cryocoolers for long-life,
high-reliability cryocooler applications. New this year are papers
de scribing the development of very large pulse tube cryocoolers to
provide up to 1500 watts of cooling for industrial applications
such as cooling the superconducting magnets of Mag-lev trains,
coolmg superconducting cables for the power mdustry, and liquefymg
natural gas. Pulse tube coolers can be driven by several competing
compressor technologies. One class of pulse tube coolers is
referred to as "Stirling type" because they are based on the linear
Oxford Stirling-cooler type compressor; these generally provide
coolmg m the 30 to 100 K temperature range and operate ^t
frequencies from 30 to 60 Hz. A second type of pulse tube cooler is
the so-called "Gifford-McMahon type. " Pulse tube coolers of this
type use a G-M type compressor and lower frequency operation (~1
Hz) to achieve temperatures in the 2 to 10 K temperature range. The
third type of pulse tube cooler is driven by a thermoacoustic
oscillator, a heat engine that functions well in remote
environments where electricity is not readily available. All three
types are described, and in total, nearly half of this proceedings
covers new developments in the pulse tube arena. Complementing the
work on low-temperature pulse tube and Gifford-McMahon cryocoolers
is substantial continued progress on rare earth regenerator
materials.
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