艾伦望远镜阵列的新型冷却馈源
New Cooled Feeds for the Allen Telescope Array
摘要：
我们已经开发了新一代的低噪音，宽带饲料的艾伦望远镜阵列在帽溪天文台在北加州。新的馈源在0.9至14 GHz的频率范围内工作。通过将整个馈电结构以及低噪声放大器冷却到70 K，馈电的噪声温度得到了显著改善。为了实现这一改进的性能，新的饲料安装在玻璃真空瓶与塑料透镜，最大限度地提高微波传输通过瓶子。冷却馈电及其低噪声放大器产生的总系统温度范围为25-30 K（1 GHz至5 GHz）和40-50 K（高达12.5 GHz）。
英文摘要：
We have developed a new generation of low noise, broadband feeds for the Allen Telescope Array at the Hat Creek Observatory in Northern California. The new feeds operate over the frequency range 0.9 to 14 GHz. The noise temperatures of the feeds have been substantially improved by cooling the entire feed structure as well as the low noise amplifiers to 70 K. To achieve this improved performance, the new feeds are mounted in glass vacuum bottles with plastic lenses that maximize the microwave transmission through the bottles. Both the cooled feeds and their low noise amplifiers produce total system temperatures that are in the range 25-30 K from 1 GHz to 5 GHz and 40-50 K up to 12.5 GHz.
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