Laminate polyethylene window development for large aperture millimeter receivers

Laminate polyethylene window development for large aperture millimeter receivers
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用于大孔径毫米接收器的层压聚乙烯窗口开发

DOI:
10.1117/12.2629591
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发表时间:
2022
期刊:
and Far-Infrared Detectors and Instrumentation for Astronomy XI
影响因子:
--
通讯作者:
Meiners, Grant
Meiners, Grant
中科院分区:
--
文献类型:
--
作者:
Eiben, Miranda;Barkats, Denis;Balkaski, Aurelia;Crystian, Sage;Dierickx, Marion I.;Goldfinger, David C.;Grimes, Paul K.;Kimberk, Robert;Kovac, John M.;Meiners, Grant

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与以前的实验相比,针对宇宙微波背景中的B模式偏振信号的新实验需要更高的灵敏度、更多的探测器,因此需要更大口径的毫米波长望远镜。这些更大的孔径需要更大的真空窗来容纳低温光学器件。按比例扩大传统真空窗,例如由高密度聚乙烯(HDPE)制成的真空窗,需要相应增加窗材料的厚度,以应对来自大气压力的额外压力。较厚的窗口在环境温度下会导致更多的传输损耗,从而增加光学负载并降低灵敏度。我们开发了一种使用编织高模数聚乙烯(HMPE)的材料,这种材料的强度是HDPE的100倍,使用加压热层压工艺制造更坚固、更薄的窗户。我们讨论了用于产生薄层压真空窗口的专用高压灭菌器的研制和全尺寸科学级窗口的光学和机械特性,目的是开发一种适用于BICEP阵列低温恒温器和未来CMB应用的新窗口。
New experiments that target the B-mode polarization signals in the Cosmic Microwave Background require more sensitivity, more detectors, and thus larger-aperture millimeter-wavelength telescopes, than previous experiments. These larger apertures require ever larger vacuum windows to house cryogenic optics. Scaling up conventional vacuum windows, such as those made of High Density Polyethylene (HDPE), require a corresponding increase in the thickness of the window material to handle the extra force from the atmospheric pressure. Thicker windows cause more transmission loss at ambient temperatures, increasing optical loading and decreasing sensitivity. We have developed the use of woven High Modulus Polyethylene (HMPE), a material 100 times stronger than HDPE, to manufacture stronger, thinner windows using a pressurized hot lamination process. We discuss the development of a specialty autoclave for generating thin laminate vacuum windows and the optical and mechanical characterization of full scale science grade windows, with the goal of developing a new window suitable for BICEP Array cryostats and for future CMB applications.
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