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- W2580491533 abstract "The vast and unimaginable greatness of the universe will never stop to amaze ushumans. A strive to know, explore or just to grasp the concept of space will alwaysdrive us, both philosophically and technically. As a result of this, the visions andadvances in radio astronomy for the foreseeable future are very optimistic and a significantpart of this will be realized in the Square Kilometre Array project (SKA).The objective is to create the world’s largest radio telescope array through interferometrywith thousands of telescopes in the deserts of Australia and South Africa. Aportion of these will be designated to single-pixel feeds on Gregorian offset reflectordishes. The band covering 350−1050 MHz is defined as SKA Band 1 and is withinthe region of the general Ultra High Frequency (UHF) band. This is a very challengingarea in radio astronomy due to the great amounts of radio-frequency interference(RFI) from cellphones, television broadcast and global navigation satellite systems(GNSS) at these frequencies. To minimize interference we require radio silent environments,and to account for other environmental effects such as the atmosphere andcosmic radiation, we need high-level optimized systems. This combination enablesus to detect weak outer space sources with a radio telescope.We show the development of a wideband Quad-Ridge Flared Horn (QRFH) feedfor Band 1 and how it fulfills our specified requirements. We discuss the propertiesof the QRFH and focus on the trade-off in reducing spill-over together with a highaperture efficiency on an offset dual reflector. For the lower end of the frequencyband in focus, there is a strong contribution of noise from the sky, which increasesthe challenges in the system design. The main objective, which is high sensitivity,is achieved with an average Aeff/Tsys > 4.2 m2/K across the 3 : 1 frequency bandand an input reflection better than −10 dB.Development of the feed is largely based on stochastic optimization with parametrizedQRFH feed models. The customizable spline horn profile and the powerof genetic algorithms is explained with an emphasis on particle swarm optimization(PSO).We also briefly mention the transfer of the electromagnetic design of the feed,into a mechanical prototype which was finished early in 2016. In late June the sameyear it was shipped to Penticton, Canada and the Dominion Radio AstrophysicalObservatory (DRAO) where it was mounted on the DVA-1, an early prototypereflector for the SKA. At 11.30 AM Pacific Standard Time (PST) on the 22nd ofJune 2016, we received first light with a sweep over the radio source Cassiopeia A." @default.
- W2580491533 created "2017-02-03" @default.
- W2580491533 creator A5061131142 @default.
- W2580491533 date "2016-01-01" @default.
- W2580491533 modified "2023-10-17" @default.
- W2580491533 title "A Wideband Quad-Ridge Flared Horn Feed Design for the Square Kilometre Array Band 1" @default.
- W2580491533 hasPublicationYear "2016" @default.
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