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dc.contributor.authorNezuka, H.en_US
dc.contributor.authorNakagome, H.en_US
dc.contributor.authorOta, M.en_US
dc.contributor.authorNumazawa, T.en_US
dc.contributor.authorMasuyama, S.en_US
dc.contributor.authorNakashima, N.en_US
dc.contributor.authorIkeya, Y.en_US
dc.date.accessioned2011-04-29T20:06:07Z
dc.date.available2011-04-29T20:06:07Z
dc.date.issued2008-05
dc.identifier.isbn978-1-934021-02-6
dc.identifier.urihttp://hdl.handle.net/1853/38759
dc.descriptionPresented at the 16th International Cryocooler Conference, held May 17-20, 2008 in Atlanta, Georgia.en_US
dc.description.abstractThis paper presents experimental results that show that the refrigeration efficiency of GM refrigerators can be improved by applying a charged pressure. Recently, there has been remarkable progress in superconducting systems, such as magnetic resonance imaging systems, silicon singlecrystal pull-up apparatus, and cryopumps. GM cryocoolers are used to cool these systems because of their high reliability. Thus, to improve the efficiency of superconducting systems, it is important to improve the efficiency of GM cryocoolers. If the compression ratio of a GM cryocooler is reduced, its coefficient of performance (COP) will approach the Carnot COP, since the cryocooler will operate with Simon expansion. Therefore, we investigated the effect of varying the charged pressure of a cryocooler and the cycle frequency on its refrigeration efficiency. We developed a GM cryocooler that can be operated at various charged pressures and we measured its efficiency at various charged pressures and operating frequencies. The optimum charged pressure and operating frequency were determined by comparing the experimental results with numerical simulation results.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesCryocoolers 16. GM-type coolers for 4-30 k ground applicationsen_US
dc.subjectGM-type coolers for 4-30 k ground applicationsen_US
dc.subjectGifford McMahon coolersen_US
dc.subjectSuperconducting systemsen_US
dc.subjectCompression ratioen_US
dc.subjectCoefficient of performanceen_US
dc.titleEffect of the Charged Pressure on GM Cryocooler Performance.en_US
dc.typeProceedingsen_US
dc.contributor.corporatenameChiba Universityen_US
dc.contributor.corporatenameNational Institute for Materials Science (Japan)en_US
dc.contributor.corporatenameOshima National College of Maritime Technologyen_US
dc.contributor.corporatenameSumitomo Heavy Industriesen_US
dc.publisher.originalICC Pressen_US


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