Improved CMB Telescope Windows Enhance Detector Sensitivity

This paper details the development and deployment of extremely thin composite polyethylene vacuum windows for millimeter-wave telescopes used to observe the cosmic microwave background (CMB). The primary motivation is to minimize radiative loss in the window, which is the only optical element at ambient temperature, thereby maximizing detector sensitivity. The windows are designed to maintain sufficient vacuum and mechanical robustness against pressure. The successful deployment of these windows on the BICEP3 and BA150 telescopes at the South Pole has demonstrated a 6% improvement in detector sensitivity on BICEP3. This improvement is significant for CMB experiments, where small gains in sensitivity can lead to substantial advancements in our understanding of the early universe. The use of low-loss polymer materials is crucial for minimizing absorption loss. The development of this technology represents a significant engineering achievement, balancing the conflicting requirements of thinness, vacuum integrity, and mechanical strength. Future research may focus on exploring alternative materials and designs to further improve window performance and reduce potential failure modes. The success of this project highlights the importance of materials science and engineering in advancing cosmological research.

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