Related papers: Characterising the Apertif primary beam response

Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope

We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of the Westerbork Synthesis Radio Telescope which has transformed this telescope into a high-sensitivity, wide field-of-view L-band imaging and…

Instrumentation and Methods for Astrophysics · Physics 2022-03-14 W. A. van Cappellen , T. A. Oosterloo , M. A. W. Verheijen , E. A. K. Adams , B. Adebahr , R. Braun , K. M. Hess , H. Holties , J. M. van der Hulst , B. Hut , E. Kooistra , J. van Leeuwen , G. M. Loose , R. Morganti , V. A. Moss , E. Orrú , M. Ruiter , A. P. Schoenmakers , N. J. Vermaas , S. J. Wijnholds , A. S. van Amesfoort , M. J. Arts , J. J. Attema , L. Bakker , C. G. Bassa , J. E. Bast , P. Benthem , R. Beukema , R. Blaauw , W. J. G. de Blok , M. Bouwhuis , R. H. van den Brink , L. Connor , A. H. W. M. Coolen , S. Damstra , G. N. J. van Diepen , R. de Goei , H. Dénes , M. Drost , N. Ebbendorf , B. S. Frank , D. W. Gardenier , M. Gerbers , Y. G. Grange , T. Grit , A. W. Gunst , N. Gupta , M. V. Ivashina , G. I. G. Józsa , G. H. Janssen , A. Koster , G. H. Kruithof , S. J. Kuindersma , A. Kutkin , D. M. Lucero , Y. Maan , F. M. Maccagni , J. van der Marel , A. Mika , J. Morawietz , H. Mulder , E. Mulder , M. J. Norden , A. R. Offringa , L. C. Oostrum , R. E. Overeem , Z. Paragi , H. J. Pepping , E. Petroff , D. J. Pisano , A. G. Polatidis , P. Prasad , J. P. R. de Reijer , J. W. Romein , J. Schaap , G. W. Schoonderbeek , R. Schulz , D. van der Schuur , A. Sclocco , J. J. Sluman , R. Smits , B. W. Stappers , S. M. Straal , K. J. C. Stuurwold , J. Verstappen , D. Vohl , K. J. Wierenga , E. E. M. Woestenburg , A. W. Zanting , J. Ziemke

The latest on Apertif

We describe a Phased Array Feed (PAF) system, called Apertif, which will be installed in the Westerbork Synthesis Radio Telescope (WSRT). The aim of Apertif is, at frequencies from 1.0 to 1.7 GHz, to increase the instantaneous field of view…

Instrumentation and Methods for Astrophysics · Physics 2019-08-12 Tom Oosterloo , Marc Verheijen , Wim van Cappellen

Apercal -- The Apertif Calibration Pipeline

Apertif (APERture Tile In Focus) is one of the Square Kilometre Array (SKA) pathfinder facilities. The Apertif project is an upgrade to the 50-year-old Westerbork Synthesis Radio Telescope (WSRT) using phased-array feed technology. The new…

Instrumentation and Methods for Astrophysics · Physics 2021-12-08 B. Adebahr , R. Schulz , T. J. Dijkema , V. A. Moss , A. R. Offringa , A. Kutkin , J. M. van der Hulst , B. S. Frank , N. P. E. Vilchez , J. Verstappen , E. K. Adams , W. J. G. de Blok , H. Denes , K. M. Hess , D. Lucero , R. Morganti , T. Oosterloo , D. -J. Pisano , M. V. Ivashina , W. A. van Cappellen , L. D. Connor , A. H. W. M. Coolen , S. Damstra , G. M. Loose , Y. Maan , F. M. Maccagni , A. Mika , H. Mulder , L. C. Oostrum , E. Orru , R. Smits , D. van der Schuur , J. van Leeuwen , D. Vohl , S. J. Wijnholds , J. Ziemke

Phased Array Feed Calibration, Beamforming and Imaging

Phased array feeds (PAFs) for reflector antennas offer the potential for increased reflector field of view and faster survey speeds. To address some of the development challenges that remain for scientifically useful PAFs, including…

Instrumentation and Methods for Astrophysics · Physics 2015-05-14 Jonathan Landon , Michael Elmer , Jacob Waldron , David Jones , Alan Stemmons , Brian D. Jeffs , Karl F. Warnick , J. Richard Fisher , Roger D. Norrod

Apertif - the focal-plane array system for the WSRT

We describe a focal plane array (FPA) system, called Apertif, that is being developed for the Westerbork Synthesis Radio Telescope (WSRT). The aim of Apertif is to increase the instantaneous field of view of the WSRT by a factor of 37 and…

Instrumentation and Methods for Astrophysics · Physics 2009-12-02 Tom Oosterloo , Marc Verheijen , Wim van Cappellen , Laurens Bakker , George Heald , Marianna Ivashina

Wide-field broadband radio imaging with phased array feeds: a pilot multi-epoch continuum survey with ASKAP-BETA

The Boolardy Engineering Test Array is a 6 x 12 m dish interferometer and the prototype of the Australian Square Kilometre Array Pathfinder (ASKAP), equipped with the first generation of ASKAP's phased array feed (PAF) receivers. These…

Instrumentation and Methods for Astrophysics · Physics 2016-03-16 I. Heywood , K. W. Bannister , J. Marvil , J. R. Allison , L. Ball , M. E. Bell , D. C. -J. Bock , M. Brothers , J. D. Bunton , A. P. Chippendale , F. Cooray , T. J. Cornwell , D. DeBoer , P. Edwards , R. Gough , N. Gupta , L. Harvey-Smith , S. Hay , A. W. Hotan , B. Indermuehle , C. Jacka , C. A. Jackson , S. Johnston , A. E. Kimball , B. S. Koribalski , E. Lenc , A. Macleod , N. McClure-Griffiths , D. McConnell , P. Mirtschin , T. Murphy , S. Neuhold , R. P. Norris , S. Pearce , A. Popping , R. Y. Qiao , J. E. Reynolds , E. M. Sadler , R. J. Sault , A. E. T. Schinckel , P. Serra , T. W. Shimwell , J. Stevens , J. Tuthill , A. Tzioumis , M. A. Voronkov , T. Westmeier , M. T. Whiting

Real-time searches for fast transients with Apertif and LOFAR

With the installation of a new phased array system called Apertif, the instantaneous field of view of the Westerbork Synthesis Radio Telescope (WSRT) has increased to 8.7$\,$deg$^2$. This system has turned the WSRT in to an highly effective…

Instrumentation and Methods for Astrophysics · Physics 2019-11-13 Yogesh Maan , Joeri van Leeuwen

First release of Apertif imaging survey data

(Abridged) Apertif is a phased-array feed system for WSRT, providing forty instantaneous beams over 300 MHz of bandwidth. A dedicated survey program started on 1 July 2019, with the last observations taken on 28 February 2022. We describe…

Instrumentation and Methods for Astrophysics · Physics 2022-11-23 Elizabeth A. K. Adams , B. Adebahr , W. J. G. de Blok , H. Denes , K. M. Hess , J. M. van der Hulst , A. Kutkin , D. M. Lucero , R. Morganti , V. A. Moss , T. A. Oosterloo , E. Orru , R. Schulz , A. S. van Amesfoort , A. Berger , O. M. Boersma , M. Bouwhuis , R. van den Brink , W. A. van Cappellen , L. Connor , A. H. W. M. Coolen , S. Damstra , G. N. J. van Diepen , T. J. Dijkema , N. Ebbendorf , Y. G. Grange , R. de Goei , A. W. Gunst , H. A. Holties , B. Hut , M. V. Ivashina , G. I. G. Jozsa , G. M. Loose , J. van Leeuwen , Y. Maan , M. Mancini , A. Mika , H. Mulder , M. J. Norden , A. R. Offringa , L. C. Oostrum , I. Pastor-Marazuela , D. J. Pisano , A. A. Ponomareva , J. W. Romein , M Ruiter , A. P. Schoenmakers , D. van der Schuur , J. J. Sluman , R. Smits , K. J. C Stuurwold , J. Verstappen , N. P. E Vilchez , D. Vohl , K. J. Wierenga , S. J. Wijnholds , E. E. M. Woestenburg , A. W. Zanting , J. Ziemke

APERTIF, a focal plane array for the WSRT

In this paper we describe a focal plane array (FPA) prototype, based on Vivaldi elements, developed for the Westerbork Synthesis Radio Telescope (WSRT) to increase its instantaneous field of view by a factor 25 and double its current…

Astrophysics · Physics 2009-11-13 M. A. W. Verheijen , T. A. Oosterloo , W. A. van Cappellen , L. Bakker , M. V. Ivashina , J. M. van der Hulst

The Standing Wave Phenomenon in Radio Telescopes; Frequency Modulation of the WSRT Primary Beam

Inadequacies in the knowledge of the primary beam response of current interferometric arrays often form a limitation to the image fidelity. We hope to overcome these limitations by constructing a frequency-resolved, full-polarization…

Astrophysics · Physics 2009-11-13 Attila Popping , Robert Braun

Beamforming in Interferometer Arrays with Cross-couplings

For an interferometric array, an image of the sky can be synthesized from interferometric visibilities, which are the cross-correlations of the received electric voltages of pairs of array elements. However, to search for transient targets…

Instrumentation and Methods for Astrophysics · Physics 2025-10-14 Yingfeng Liu , Shijie Sun , Kaifeng Yu , Furen Deng , Shifan Zuo , Jixia Li , Yougang Wang , Fengquan Wu , Xuelei Chen

The Apertif Radio Transient System (ARTS): Design, Commissioning, Data Release, and Detection of the first 5 Fast Radio Bursts

Fast Radio Bursts must be powered by uniquely energetic emission mechanisms. This requirement has eliminated a number of possible source types, but several remain. Identifying the physical nature of Fast Radio Burst (FRB) emitters arguably…

High Energy Astrophysical Phenomena · Physics 2023-04-12 Joeri van Leeuwen , Eric Kooistra , Leon Oostrum , Liam Connor , J. E. Hargreaves , Yogesh Maan , Inés Pastor-Marazuela , Emily Petroff , Daniel van der Schuur , Alessio Sclocco , Samayra M. Straal , Dany Vohl , Stefan J. Wijnholds , Elizabeth A. K. Adams , Björn Adebahr , Jisk Attema , Cees Bassa , Jeanette E. Bast , Anna Bilous , W. J. G. de Blok , Oliver M. Boersma , Wim A. van Cappellen , Arthur H. W. M. Coolen , Sieds Damstra , Helga Dénes , Ger N. J. van Diepen , David W. Gardenier , Yan G. Grange , André W. Gunst , Kelley M. Hess , Hanno Holties , Thijs van der Hulst , Boudewijn Hut , Alexander Kutkin , G. Marcel Loose , Danielle M. Lucero , Ágnes Mika , Klim Mikhailov , Raffaella Morganti , Vanessa A. Moss , Henk Mulder , Menno J. Norden , Tom A. Oosterloo , Emaneula Orrú , Zsolt Paragi , Jan-Pieter R. de Reijer , Arno P. Schoenmakers , Klaas J. C. Stuurwold , Sander ter Veen , Yu-Yang Wang , Alwin W. Zanting , Jacob Ziemke

A Model for Phased Array Feed

In this report we present a model for phased array feed (PAF) and compare the model predictions with measurements. A theory for loss-less PAF is presented first. To develop the theory we ask the question -- what is the best…

Instrumentation and Methods for Astrophysics · Physics 2019-02-06 D. Anish Roshi , J. Richard Fisher

Apertif 1.4 GHz continuum observations of the Bo\"otes field and their combined view with LOFAR

We present a new image of a 26.5 square degree region in the Bo\"otes constellation obtained at 1.4 GHz using the Aperture Tile in Focus (Apertif) system on the Westerbork Synthesis Radio Telescope. We use a newly developed processing…

Instrumentation and Methods for Astrophysics · Physics 2023-08-09 A. M. Kutkin , T. A. Oosterloo , R. Morganti , A. R. Offringa , E. A. K. Adams , B. Adebahr , H. Dénes , K. M. Hess , J. M. van der Hulst , W. J. G. de Blok , A. Bozkurt , W. A. van Cappellen , A. W. Gunst , H. A. Holties , J. van Leeuwen , G. M. Loose , L. C. Oostrum , D. Vohl , S. J. Wijnholds , J. Ziemke

An interference detection strategy for Apertif based on AOFlagger 3

Context. Apertif is a multi-beam receiver system for the Westerbork Synthesis Radio Telescope that operates at 1.1-1.5 GHz, which overlaps with various radio services, resulting in contamination of astronomical signals with radio-frequency…

Instrumentation and Methods for Astrophysics · Physics 2023-02-22 A. R. Offringa , B. Adebahr , A. Kutkin , E. A. K. Adams , T. A. Oosterloo , J. M. van der Hulst , H. Dénes , C. G. Bassa , D. L. Lucero , W. J. G. Blok , K. M. Hess , J. van Leeuwen , G. M. Loose , Y. Maan , L. C. Oostrum , E. Orrú , D. Vohl , J. Ziemke

The Performance and Calibration of the CRAFT Fly's Eye Fast Radio Burst Survey

Since January 2017, the Commensal Real-time ASKAP Fast Transients survey (CRAFT) has been utilising commissioning antennas of the Australian SKA Pathfinder (ASKAP) to survey for fast radio bursts (FRBs) in fly's eye mode. This is the first…

High Energy Astrophysical Phenomena · Physics 2019-03-06 C. W. James , K. W. Bannister , J. -P. Macquart , R. D. Ekers , S. Oslowski , R. M. Shannon , J. R. Allison , A. P. Chippendale , J. D. Collier , T. Franzen , A. W. Hotan , M. Leach , D. McConnell , M. A. Pilawa , M. A. Voronkov , M. T. Whiting

Element gain drifts as an imaging dynamic range limitation in PAF-based interferometers

Interferometry with phased-array feeds (PAFs) presents new calibration challenges in comparison with single-pixel feeds. In particular, temporal instability of the compound beam patterns due to element gain drifts (EGDs) can produce…

Instrumentation and Methods for Astrophysics · Physics 2011-10-14 O. M. Smirnov , M. V. Ivashina

Performance of a highly sensitive, 19-element, dual-polarization, cryogenic L-band Phased Array Feed on the Green Bank Telescope

A new 1.4 GHz 19-element, dual-polarization, cryogenic phased array feed (PAF) radio astronomy receiver has been developed for the Robert C. Byrd Green Bank Telescope (GBT) as part of FLAG (Focal L-band Array for the GBT) project.…

Instrumentation and Methods for Astrophysics · Physics 2018-05-02 D. Anish Roshi , W. Shillue , B. Simon , K. F. Warnick , B. Jeffs , D. J. Pisano , R. Prestage , S. White , J. R. Fisher , M. Morgan , R. Black , M. Burnett , J. Diao , M. Ruzindana , V. van Tonder , L. Hawkins , P. Marganian , T. Chamberlin , J. Ray , N. M. Pingel , K. Rajwade , D. R. Lorimer , A. Rane , J. Castro , W. Groves , L. Jensen , J. D. Nelson , T. Boyd , A. J. Beasley

Effects of the Number of Active Receiver Channels on the Sensitivity of a Reflector Antenna System with a Multi-Beam Wideband Phased Array Feed

A method for accurate modeling of a reflector antenna system with a wideband phased array feed is presented and used to study the effects of the number of active antenna elements and associated receiving channels on the receiving…

Instrumentation and Methods for Astrophysics · Physics 2016-02-16 O. Iupikov

Effects of the Number of Active Receiver Channels on the Sensitivity of a Reflector Antenna System with a Multi-Beam Wideband Phased Array Feed

A method for modeling a reflector antenna system with a wideband phased array feed is presented and used to study the effects of the number of active antenna elements and associated receiving channels on the sensitivity of the system.…

Instrumentation and Methods for Astrophysics · Physics 2011-10-21 Oleg Iupikov