Flight Performance of the AKARI Cryogenic System

Nakagawa Takao; Enya Keigo; Hirabayashi Masayuki; Kaneda Hidehiro; Kii Tsuneo; Kimura Yoshiyuki; Matsumoto Toshio; Murakami Hiroshi; Murakami Masahide; Narasaki Katsuhiro; Narita Masanao; Ohnishi Akira; Tsunematsu Shoji; Yoshida Seiji

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Flight Performance of the AKARI Cryogenic System

机译：AKARI低温系统的飞行性能

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WedescribetheflightperformanceofthecryogenicsystemoftheinfraredastronomicalsatelliteAKARI,whichwassuccessfullylaunchedon2006February21(UT).AKARIcarriesa68.5cmtelescopetogetherwithtwofocal-planeinstruments,InfraredCamerasandFarInfraredSurveyor,allofwhicharecooleddowntocryogenictemperaturetoachievesuperiorsensitivity.AKARIhasauniquecryogenicsystem,whichconsistsofcryogen(liquidhelium)andmechanicalcoolers(2-stageStirlingcoolers).Withthehelpofmechanicalcoolers,179L(26.0kg)ofsuper-fluidliquidheliumcankeeptheinstrumentscryogenicallycooledformorethan500days.Theon-orbitperformanceoftheAKARIcryogenicsisconsistentwiththedesignandapre-flighttest,andtheboil-offgasflowrateisassmallas0.32mgs$$^{-1}$$.WeobservedanincreaseinthemajoraxisoftheAKARIorbit,whichcanbeexplainedbythrustduetothethermalpressureofventedheliumgas.

机译：WedescribetheflightperformanceofthecryogenicsystemoftheinfraredastronomicalsatelliteAKARI，whichwassuccessfullylaunchedon2006February21（UT）.AKARIcarriesa68.5cmtelescopetogetherwithtwofocal-planeinstruments，InfraredCamerasandFarInfraredSurveyor，allofwhicharecooleddowntocryogenictemperaturetoachievesuperiorsensitivity.AKARIhasauniquecryogenicsystem，whichconsistsofcryogen（liquidhelium）andmechanicalcoolers（2- stageStirlingcoolers）.Withthehelpofmechanicalcoolers，179L（26.0公斤）ofsuper-fluidliquidheliumcankeeptheinstrumentscryogenicallycooledformorethan500days.Theon-orbitperformanceoftheAKARIcryogenicsisconsistentwiththedesignandapre-flighttest，andtheboil-offgasflowrateisassmallas0 .32mgs $$ ^ {-1} $$。我们观察到AKARI轨道的长轴上的增加，这可以通过通入氦气的热压来解释。

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《PASJ: Publications of the Astronomical Society of Japan》 |2007年第sp2期|共页
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Nakagawa Takao; Enya Keigo; Hirabayashi Masayuki; Kaneda Hidehiro; Kii Tsuneo; Kimura Yoshiyuki; Matsumoto Toshio; Murakami Hiroshi; Murakami Masahide; Narasaki Katsuhiro; Narita Masanao; Ohnishi Akira; Tsunematsu Shoji; Yoshida Seiji;
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Flight Performance of the AKARI Cryogenic System

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