Cryogen free cooling of ASTRO-H SXS Helium Dewar from 300?K to 4?K
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Cryogen free cooling of ASTRO-H SXS Helium Dewar from 300?K to 4?K

机译：低温冷却Astro-H SXS氦杜瓦尔从300？K到4？K.

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Highlights?SXS Dewar has hybrid cooling system combining liquid helium and cryocoolers.?SXS Dewar has cryogen free operation mode without liquid helium.?Cold mass in 4?K area is 35?kg.?He tank temperature reached to 4.5?K in 37?days.?Maximum power was 264?W in total.AbstractSoft X-ray Spectrometer instrument (SXS) is one of the primary scientific instruments of ASTRO-H. SXS has a cold detector that is cooled to 50?mK by using a multi-stage Adiabatic Demagnetization Refrigerator (ADR). SXS Dewar containing ADR provides 1.3?K heat sink by using liquid helium in nominal operation. After liquid helium is dried up, 4?K heat sink is provided by using mechanical coolers. Both nominal operation and cryogen free operation were successfully demonstrated. This paper describes the test result of cryogen free operation and cool-down performance from room temperature by using only mechanical coolers without liquid helium. The coolers on the Dewar cooled down cold mass from around 300?K to 4?K with 260?W electric power in 40?days. Cold mass is 35?kg in 4?K area including the helium tank, ADR and detector assembly.]]>
机译：<！[cdata [ 亮点 ？ SXS Dewar具有结合液氦和冷冻室的混合冷却系统。 ？ SXS Dewar具有冷冻机自由操作模式没有液氦。 ？ 4？K区域的冷质群是35？kg。 ？ 他坦克温度达到4.5？k在37？天。 < CE：list-item id =“o0025”> ？ 最大功率总计为264？w总数为264. 抽象 软X射线光谱仪仪器（SXS）是Astro-H的主要科学仪器之一。 SXS具有冷探测器，通过使用多级绝热退磁冰箱（ADR）冷却至50架MK。含有ADR的SXS杜瓦通过使用液氦在标称操作中提供1.3 k瓶散热器。液氦干燥后，通过使用机械冷却器提供4μk散热器。成功证明了标称操作和低温操作。本文介绍了通过仅使用没有液氦的机械冷却器，从室温下冷冻操作和冷却性能的测试结果。杜瓦尔上的冷却器冷却冷质量从大约300μk到4？k，用260℃，电力40℃。冷肿块为35？Kg，包括氦气罐，ADR和探测器组件。 ]]>

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