Flight Performance of the AKARI Cryogenic System
Flight Performance of the AKARI Cryogenic System
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DOI：
10.1093/pasj/59.sp2.s377
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发表时间：
2007-08
影响因子：
2.3
通讯作者：
T. Nakagawa;K. Enya;M. Hirabayashi;H. Kaneda;T. Kii;Y. Kimura;T. Matsumoto;H. Murakami;M. Murak
中科院分区：
文献类型：
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作者：
T. Nakagawa;K. Enya;M. Hirabayashi;H. Kaneda;T. Kii;Y. Kimura;T. Matsumoto;H. Murakami;M. Murak
我们描述的红外天文卫星AKARI，这是成功地发射于2006年2月21日（UT）的低温系统的飞行性能。AKARI携带了一个68.5厘米的望远镜以及两个焦平面仪器，红外相机（IRC）和远红外探测器（FIS），所有这些都被冷却到低温，以实现上级灵敏度。AKARI低温系统是一种独特的混合系统，由制冷剂（液氦）和机械冷却器（2级斯特林冷却器）组成。在机械冷却器的帮助下，179 L（26.0 kg）的超流液氦可以使仪器保持低温冷却超过500天。AKARI低温设备的在轨性能与设计和飞行前试验一致，蒸发气体流量小至0.32 mg/s。我们观察到AKARI轨道长轴的增加，这可以解释为由于排出的氦气的热压力的推力。
We describe the flight performance of the cryogenic system of the infrared astronomical satellite AKARI, which was successfully launched on 2006 February 21 (UT). AKARI carries a 68.5 cm telescope together with two focal plane instruments, Infrared Cameras (IRC) and Far Infrared Surveyor (FIS), all of which are cooled down to cryogenic temperature to achieve superior sensitivity. The AKARI cryogenic system is a unique hybrid system, which consists of cryogen (liquid helium) and mechanical coolers (2-stage Stirling coolers). With the help of the mechanical coolers, 179 L (26.0 kg) of super-fluid liquid helium can keep the instruments cryogenically cooled for more than 500 days. The on-orbit performance of the AKARI cryogenics is consistent with the design and pre-flight test, and the boil-off gas flow rate is as small as 0.32 mg/s. We observed the increase of the major axis of the AKARI orbit, which can be explained by the thrust due to thermal pressure of vented helium gas.