Sorption-based vibration-free cooler for the METIS instrument on E-ELT
Sorption-based vibration-free cooler for the METIS instrument on E-ELT
复制标题
用于 E-ELT 上 METIS 仪器的吸附式无振动冷却器
DOI：
10.1117/12.927002
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
E. Boom
中科院分区：
文献类型：
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作者：
H. T. ter Brake;Y. Wu;D. Zalewski;C. Vermeer;H. J. Holland;J. Doornink;B. Benthem;E. Boom
METIS是欧洲极大望远镜的“中红外ELT成像仪和光谱仪”。这种E-ELT仪器将覆盖3至14 μm的热/中红外波长范围，需要对探测器和光学器件进行低温冷却。我们提出了一种无振动的冷却技术，该仪器的基础上开发的特温特大学与荷兰空间的吸附冷却器。在基线设计中，仪器有四个温度水平：N波段：探测器在8 K，光学系统在25 K; L/M波段：探测器在40 K，光学系统在77 K。后者的温度由具有足够冷却能力的液氮供应建立。在较低的三个水平所需的冷却功率分别为0.4 W、1.1 W和1.4 W。我们提出的低温冷却技术使用基于工作气体在吸附剂材料（例如活性炭）上的循环吸附和解吸的压缩机。在解吸下，可以建立高压。当高压流体在流动限制上膨胀时，获得冷却。这种冷却技术的最大优点是，除了被动阀之外，它不包含任何移动部件，因此不会产生振动。显然，这在灵敏的高性能光学系统中是非常有吸引力的。另一个优点是低至mK水平的高温稳定性。在荷兰的一个国家研究计划中，我们的目标是为METIS开发一种更冷的演示器。在本文中，我们将描述我们的冷却器技术，并讨论METIS冷却器演示器的发展。
METIS is the 'Mid-infrared ELT Imager and Spectrograph' for the European Extremely Large Telescope. This E-ELT instrument will cover the thermal/mid-infrared wavelength range from 3 to 14 μm and will require cryogenic cooling of detectors and optics. We present a vibration-free cooling technology for this instrument based on sorption coolers developed at the University of Twente in collaboration with Dutch Space. In the baseline design, the instrument has four temperature levels: N-band: detector at 8 K and optics at 25 K; L/M-band: detector at 40K and optics at 77 K. The latter temperature is established by a liquid nitrogen supply with adequate cooling power. The cooling powers required at the lower three levels are 0.4 W, 1.1 W, and 1.4 W, respectively. The cryogenic cooling technology that we propose uses a compressor based on the cyclic adsorption and desorption of a working gas on a sorber material such as activated carbon. Under desorption, a high pressure can be established. When expanding the high-pressure fluid over a flow restriction, cooling is obtained. The big advantage of this cooling technology is that, apart from passive valves, it contains no moving parts and, therefore, generates no vibrations. This, obviously, is highly attractive in sensitive, high-performance optical systems. A further advantage is the high temperature stability down to the mK level. In a Dutch national research program we aim to develop a cooler demonstrator for METIS. In the paper we will describe our cooler technology and discuss the developments towards the METIS cooler demonstrator.