Dr. Amanda Weltman Profile

Dr. Amanda Weltman

at Univ. of Cape Town

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 26 August 2022 Paper

Antenna characterization for the HIRAX experiment

Emily Kuhn, Benjamin R. B. Saliwanchik, Kevin Bandura, Michele Bianco, H. Cynthia Chiang, Devin Crichton, Meiling Deng, Sindhu Gaddam, Kit Gerodias, Austin Gumba, Maile Harris, Kavilan Moodley, Mugundhan V., Laura Newburgh, Jeffrey Peterson, Elizabeth Pieters, Alexandre Refregier, Ajith Sampath, Mario Santos, Onkabetse Sengate, Jonathan Sievers, Ema Smith, Will Tyndall, Anthony Walters, Amanda Weltman, Dallas Wulf

Proceedings Volume 12182, 1218225 (2022) https://doi.org/10.1117/12.2627856

KEYWORDS: Antennas, Temperature metrology, Amplifiers, Optical testing, Polarization, Nitrogen, Transmitters, Optical simulations, Liquids

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SPIE Journal Paper | 12 January 2022

Hydrogen Intensity and Real-Time Analysis Experiment: 256-element array status and overview

Devin Crichton, Moumita Aich, Adam Amara, Kevin Bandura, Bruce Bassett, Carlos Bengaly, Pascale Berner, Shruti Bhatporia, Martin Bucher, Tzu-Ching Chang, H. Cynthia Chiang, Jean-François Cliche, Carolyn Crichton, Romeel Dave, Dirk I. De Villiers, Matt Dobbs, Aaron M. Ewall-Wice, Scott Eyono, Christopher Finlay, Sindhu Gaddam, Ken Ganga, Kevin Gayley, Kit Gerodias, Tim Gibbon, Austine Gumba, Neeraj Gupta, Maile Harris, Heiko Heilgendorff, Matt Hilton, Adam D. Hincks, Pascal Hitz, Mona Jalilvand, Roufurd P. M. Julie, Zahra Kader, Joseph Kania, Dionysios Karagiannis, Aris Karastergiou, Kabelo Kesebonye, Piyanat Kittiwisit, Jean-Paul Kneib, Kenda Knowles, Emily Kuhn, Martin Kunz, Roy Maartens, Vincent MacKay, Stuart MacPherson, Christian Monstein, Kavilan Moodley, V. Mugundhan, Warren Naidoo, Arun Naidu, Laura Newburgh, Viraj Nistane, Amanda Di Nitto, Deniz Ölçek, Xinyu Pan, Sourabh Paul, Jeffrey Peterson, Elizabeth Pieters, Carla Pieterse, Aritha Pillay, Anna Polish, Liantsoa Randrianjanahary, Alexandre Refregier, Andre Renard, Edwin Retana-Montenegro, Ian H. Rout, Cyndie Russeeawon, Alireza Vafaei Sadr, Benjamin R. Saliwanchik, Ajith Sampath, Pranav Sanghavi, Mario Santos, Onkabetse Sengate, J. Richard Shaw, Jonathan L. Sievers, Oleg M. Smirnov, Kendrick Smith, Ulrich Armel Mbou Sob, Raghunathan Srianand, Pieter Stronkhorst, Dhaneshwar D. Sunder, Simon Tartakovsky, Russ Taylor, Peter Timbie, Emma Tolley, Junaid Townsend, Will Tyndall, Cornelius Ungerer, Jacques van Dyk, Gary van Vuuren, Keith Vanderlinde, Thierry Viant, Anthony Walters, Jingying Wang, Amanda Weltman, Patrick Woudt, Dallas Wulf, Anatoly Zavyalov, Zheng Zhang

JATIS, Vol. 8, Issue 01, 011019, (January 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.1.011019

KEYWORDS: Hydrogen, Telescopes, Baryon acoustic oscillations, Radio astronomy, Receivers, Visibility, Physics, Signal processing, Pulsars, Observatories

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Proceedings Article | 20 January 2021 Poster + Paper

Noise temperature testing for the Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX)

Emily Kuhn, Benjamin R. Saliwanchik, Maile Harris, Moumita Aich, Kevin Bandura, Tzu-Ching Chang, H. Cynthia Chiang, Devin Crichton, Aaron Ewall-Wice, Austin Gumba, Neeraj Gupta, Kabelo Calvin Kesebonye, Jean-Paul Kneib, Martin Kunz, Kavilan Moodley, Laura Newburgh, Viraj Nistane, Warren Naidoo, Deniz Ölçek, Jeffrey Peterson, Alexandre Refregier, Jonathan Sievers, Corrie Ungerer, Alireza Vafaei Sadr, Jacques van Dyk, Amanda Weltman, Dallas Wulf

Proceedings Volume 11445, 114452Z (2021) https://doi.org/10.1117/12.2560270

KEYWORDS: Calibration, Hydrogen, Baryon acoustic oscillations, Temperature metrology, Optical testing, Antennas

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Proceedings Article | 11 January 2021 Poster + Paper

Mechanical and optical design of the HIRAX radio telescope

Benjamin R. Saliwanchik, Aaron Ewall-Wice, Devin Crichton, Emily Kuhn, Deniz Ölçek, Kevin Bandura, Martin Bucher, Tzu-Ching Chang, H. Cynthia Chiang, Kit Gerodias, Kabelo Kesebonye, Vincent MacKay, Kavilan Moodley, Laura Newburgh, Viraj Nistane, Jeffrey Peterson, Elizabeth Pieters, Carla Pieterse, Keith Vanderlinde, Jonathan Sievers, Amanda Weltman, Dallas Wulf

Proceedings Volume 11445, 114455O (2021) https://doi.org/10.1117/12.2552508

KEYWORDS: Optical design, Radio telescopes, Baryon acoustic oscillations, Hydrogen, Electromagnetism, Interferometry, Device simulation, Optical simulations

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Proceedings Article | 8 August 2016 Paper

HIRAX: a probe of dark energy and radio transients

L. Newburgh, K. Bandura, M. Bucher, T.-C. Chang, H. Chiang, J.F. Cliche, R. Davé, M. Dobbs, C. Clarkson, K. Ganga, T. Gogo, A. Gumba, N. Gupta, M. Hilton, B. Johnstone, A. Karastergiou, M. Kunz, D. Lokhorst, R. Maartens, S. Macpherson, M. Mdlalose, K. Moodley, L. Ngwenya, J. Parra, J. Peterson, O. Recnik, B. Saliwanchik, M. Santos, J. Sievers, O. Smirnov, P. Stronkhorst, R. Taylor, K. Vanderlinde, G. Van Vuuren, A. Weltman, A. Witzemann

Proceedings Volume 9906, 99065X (2016) https://doi.org/10.1117/12.2234286

KEYWORDS: Baryon acoustic oscillations, Hydrogen, Interferometers, Galactic astronomy, Optical correlators, Antennas, Calibration, Prototyping, Physics, Astronomy

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The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a new 400{800MHz radio interferometer under development for deployment in South Africa. HIRAX will comprise 1024 six meter parabolic dishes on a compact grid and will map most of the southern sky over the course of four years. HIRAX has two primary science goals: to constrain Dark Energy and measure structure at high redshift, and to study radio transients and pulsars. HIRAX will observe unresolved sources of neutral hydrogen via their redshifted 21-cm emission line (`hydrogen intensity mapping'). The resulting maps of large-scale structure at redshifts 0.8{2.5 will be used to measure Baryon Acoustic Oscillations (BAO). BAO are a preferential length scale in the matter distribution that can be used to characterize the expansion history of the Universe and thus understand the properties of Dark Energy. HIRAX will improve upon current BAO measurements from galaxy surveys by observing a larger cosmological volume (larger in both survey area and redshift range) and by measuring BAO at higher redshift when the expansion of the universe transitioned to Dark Energy domination. HIRAX will complement CHIME, a hydrogen intensity mapping experiment in the Northern Hemisphere, by completing the sky coverage in the same redshift range. HIRAX's location in the Southern Hemisphere also allows a variety of cross-correlation measurements with large-scale structure surveys at many wavelengths. Daily maps of a few thousand square degrees of the Southern Hemisphere, encompassing much of the Milky Way galaxy, will also open new opportunities for discovering and monitoring radio transients. The HIRAX correlator will have the ability to rapidly and efficiently detect transient events. This new data will shed light on the poorly understood nature of fast radio bursts (FRBs), enable pulsar monitoring to enhance long-wavelength gravitational wave searches, and provide a rich data set for new radio transient phenomena searches. This paper discusses the HIRAX instrument, science goals, and current status.

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