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This paper introduces helium recondensing in a 4000l dewar using a 4K pulse tube cryocooler at Amundsen–Scott research station at the South Pole. The helium dewar has a normal boil-off rate of 14l/day. Two features of cooling the dewar neck by helium vapor and precooling helium gas to be liquefied ensured high efficiency of the pulse tube recondenser in this application. The liquefier/recondenser...
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