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18 April 2024

» arxiv » 0903.1828

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The Murchison Widefield Array: Design Overview
Colin J. Lonsdale ; Roger J. Cappallo ; Miguel F. Morales ; Frank H. Briggs ; Leonid Benkevitch ; Judd D. Bowman ; John D. Bunton ; Steven Burns ; Brian E. Corey ; Ludi deSouza ; Sheperd S. Doeleman ; Mark Derome ; Avinash Deshpande ; M. R. Gopalakrishna ; Lincoln J. Greenhill ; David Herne ; Jacqueline N. Hewitt ; P. A. Kamini ; Justin C. Kasper ; Barton B. Kincaid ; Jonathan Kocz ; Errol Kowald ; Eric Kratzenberg ; Deepak Kumar ; Mervyn J. Lynch ; S. Madhavi ; Michael Matejek ; Daniel Mitchell ; Edward Morgan ; Divya Oberoi ; Steven Ord ; Joseph Pathikulangara ; T. Prabu ; Alan E.E. Rogers ; Anish Roshi ; Joseph E. Salah ; Robert J. Sault ; N. Udaya Shankar ; K. S. Srivani ; Jamie Stevens ; Steven Tingay ; Annino Vaccarella ; Mark Waterson ; Randall B. Wayth ; Rachel L. Webster ; Alan R. Whitney ; Andrew Williams ; Christopher Williams ;
Date:	10 Mar 2009
Abstract:	The Murchison Widefield Array (MWA) is a dipole-based aperture array synthesis telescope designed to operate in the 80-300 MHz frequency range. It is capable of a wide range of science investigations, but is initially focused on three key science projects. These are detection and characterization of 3-dimensional brightness temperature fluctuations in the 21cm line of neutral hydrogen during the Epoch of Reionization (EoR) at redshifts from 6 to 10, solar imaging and remote sensing of the inner heliosphere via propagation effects on signals from distant background sources,and high-sensitivity exploration of the variable radio sky. The array design features 8192 dual-polarization broad-band active dipoles, arranged into 512 tiles comprising 16 dipoles each. The tiles are quasi-randomly distributed over an aperture 1.5km in diameter, with a small number of outliers extending to 3km. All tile-tile baselines are correlated in custom FPGA-based hardware, yielding a Nyquist-sampled instantaneous monochromatic uv coverage and unprecedented point spread function (PSF) quality. The correlated data are calibrated in real time using novel position-dependent self-calibration algorithms. The array is located in the Murchison region of outback Western Australia. This region is characterized by extremely low population density and a superbly radio-quiet environment,allowing full exploitation of the instrumental capabilities.
Source:	arXiv, 0903.1828
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