Mr. Nialh McCallum Profile

Nialh McCallum

at The Univ. of Manchester

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Publications (3)

Proceedings Article | 31 July 2018 Presentation + Paper

The Simons Observatory: instrument overview

Nicholas Galitzki, Aamir Ali, Kam Arnold, Peter Ashton, Jason Austermann, Carlo Baccigalupi, Taylor Baildon, Darcy Barron, James Beall, Shawn Beckman, Sarah Marie Bruno, Sean Bryan, Paolo Calisse, Grace Chesmore, Yuji Chinone, Steve Choi, Gabriele Coppi, Kevin Crowley, Ari Cukierman, Mark Devlin, Simon Dicker, Bradley Dober, Shannon Duff, Jo Dunkley, Giulio Fabbian, Patricio Gallardo, Martina Gerbino, Neil Goeckner-Wald, Joseph Golec, Jon Gudmundsson, Erin Healy, Shawn Henderson, Charles Hill, Gene Hilton, Shuay-Pwu Patty Ho, Logan Howe, Johannes Hubmayr, Oliver Jeong, Brian Keating, Brian Koopman, Kenji Kiuchi, Akito Kusaka, Jacob Lashner, Adrian Lee, Yaqiong Li, Michele Limon, Marius Lungu, Frederick Matsuda, Philip Mauskopf, Andrew May, Nialh McCallum, Jeff McMahon, Federico Nati, Michael Niemack, John Orlowski-Scherer, Stephen Parshley, Lucio Piccirillo, Mayuri Sathyanarayana Rao, Christopher Raum, Maria Salatino, Joseph Seibert, Carlos Sierra, Max Silva-Feaver, Sara Simon, Suzanne Staggs, Jason Stevens, Aritoki Suzuki, Grant Teply, Robert Thornton, Calvin Tsai, Joel Ullom, Eve Vavagiakis, Michael Vissers, Benjamin Westbrook, Edward Wollack, Zhilei Xu, Ningfeng Zhu

Proceedings Volume 10708, 1070804 (2018) https://doi.org/10.1117/12.2312985

KEYWORDS: Sensors, Receivers, Telescopes, Cryogenics, Physics, Wafer-level optics, Semiconducting wafers, Lenses, Staring arrays, Observatories

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Proceedings Article | 17 July 2018 Paper

Designs for next generation CMB survey strategies from Chile

Jason Stevens, Neil Goeckner-Wald, Reijo Keskitalo, Nialh McCallum, Aamir Ali, Julian Borrill, Michael Brown, Yuji Chinone, Patricio Gallardo, Akito Kusaka, Adrian Lee, Jeff McMahon, Michael Niemack, Lyman Page, Giuseppe Puglisi, Maria Salatino, Suet Ying Mak, Grant Teply, Daniel Thomas, Eve Vavagiakis, Edward Wollack, Zhilei Xu, Ningfeng Zhu

Proceedings Volume 10708, 1070841 (2018) https://doi.org/10.1117/12.2313898

KEYWORDS: Telescopes, Sun, Sensors, Polarization, Physics, Device simulation, Optical instrument design, Anisotropy, Signal detection

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New telescopes are being built to measure the Cosmic Microwave Background (CMB) with unprecedented sensitivity, including Simons Observatory (SO), CCAT-prime, the BICEP Array, SPT-3G, and CMB Stage-4. We present observing strategies for telescopes located in Chile that are informed by the tools used to develop recent Atacama Cosmology Telescope (ACT) and Polarbear surveys. As with ACT and Polarbear, these strategies are composed of scans that sweep in azimuth at constant elevation.

We explore observing strategies for both small (0.42 m) aperture telescopes (SAT) and a large (6 m) aperture telescope (LAT). We study strategies focused on small sky areas to search for inflationary gravitational waves as well as strategies spanning roughly half the low-foreground sky to constrain the effective number of relativistic species and measure the sum of neutrino masses via the gravitational lensing signal due to large scale structure. We present these strategies specifically considering the telescope hardware and science goals of the SO, located at 23° South latitude, 67.8° West longitude.

Observations close to the Sun and the Moon can introduce additional systematics by applying additional power to the instrument through telescope sidelobes. Significant side lobe contamination in the data can occur even at tens of degrees or more from bright sources. Therefore, we present several strategies that implement Sun and Moon avoidance constraints into the telescope scheduling.

Scan strategies can also be a powerful tool to diagnose and mitigate instrumental systematics either by using multiple scans to average down systematics or by providing null tests to diagnose problems. We discuss methods for quantifying the ability of an observation strategy to achieve this.

Strategies for resolving conflicts between simultaneously visible fields are discussed. We focus on maximizing telescope time spent on science observations. It will also be necessary to schedule calibration measurements, however that is beyond the scope of this work. The outputs of this study are algorithms that can generate specific schedule commands for the Simons Observatory instruments.

Proceedings Article | 9 July 2018 Paper

Studies of systematic uncertainties for Simons Observatory: detector array effects

Kevin Crowley, Sara Simon, Max Silva-Feaver, Neil Goeckner-Wald, Aamir Ali, Jason Austermann, Michael Brown, Yuji Chinone, Ari Cukierman, Bradley Dober, Shannon Duff, Jo Dunkley, Josquin Errard, Giulio Fabbian, Patricio Gallardo, Shuay-Pwu Patty Ho, Johannes Hubmayr, Brian Keating, Akito Kusaka, Nialh McCallum, Jeff McMahon, Federico Nati, Michael Niemack, Giuseppe Puglisi, Mayuri Sathyanarayana Rao, Christian Reichardt, Maria Salatino, Praween Siritanasak, Suzanne Staggs, Aritoki Suzuki, Grant Teply, Daniel Thomas, Joel Ullom, Clara Vergès, Michael Vissers, Benjamin Westbrook, Edward Wollack, Zhilei Xu, Ningfeng Zhu

Proceedings Volume 10708, 107083Z (2018) https://doi.org/10.1117/12.2313414

KEYWORDS: Sensors, Polarization, Bolometers, Signal detection, Detector arrays, Calibration, Contamination, Antennas, Device simulation, Optical simulations

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