Why the World’s Biggest Radio Telescope Had to Tweak Nature’s Perfect Sunflower Spiral

Scientists found that the SKA-Low telescope's antenna layout, designed in a Vogel spiral pattern, caused a significant drop in sensitivity at 125 MHz due to antenna proximity. The pattern, intended to prevent close antenna clustering, inadvertently created destructive interference. The antennas were placed too close together, causing signal cancellation. This issue was identified during testing and resolved by introducing a perturbation to the pattern. The test setup showed that the 2.4m spacing between antennas matched the wavelength of the 125 MHz signal, leading to interference. The researchers adjusted the layout to avoid this problem. The findings highlight the importance of preliminary testing in radio astronomy. The SKA-Low will have 131,000 antennas spread over 75 square kilometers, and the perturbed Vogel pattern is a solution. The results show that the antenna configuration itself can create issues, emphasizing the need for careful planning. The SKA is expected to revolutionize the search for alien life.

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