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Cryocoolers 12 (Paperback, Softcover reprint of the original 1st ed. 2003)
Loot Price: R5,888
Discovery Miles 58 880
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Cryocoolers 12 (Paperback, Softcover reprint of the original 1st ed. 2003)
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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. One class of pulse tubes
that has reached maturity is referred to as "Stirling type" because
they are based on the linear Oxford Stirling-cooler type
compressor; these generally provide cooling in the 30 to 100 K
temperature range and operate at frequencies from 30 to 60 Hz. The
other type of pulse tube cooler making great advances is the
so-called "Gifford-McMahon type. " Pulse tube coolers of this type
use a G-M type compressor and lower frequency operation to achieve
temperatures in the 2 to 10 K temperature range. Nearly a third of
this proceedings covers these new developments in the pulse tube
arena. Complementing the work on low-temperature pulse tubes is
substantial continued progress on rare earth regenerator materials
and Gifford-McMahon coolers. These technologies continue to make
great progress in opening up the 2 - 4 K market. Also in the
commercial sector, continued interest is being shown in the
development of long-life, low-cost cryocoolers for the emerging
high temperature superconductor electronics market, particularly
the cellular telephone base-station market. At higher temperature
levels, closed-cycle J-T or throttle-cycle refrigerators are taking
advantage of mixed refrigerant gases to achieve low-cost cryocooler
systems in the 65 to 80 K temperature range.
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