Ms. Grace Chesmore Profile

Grace Chesmore

at Univ of Chicago

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Author

Publications (9)

Proceedings Article | 11 September 2024 Poster + Paper

The Simons Observatory: laboratory beam characterization for the first small aperture telescope

Remington Gerras, Thomas Alford, Michael Randall, Joseph Seibert, Grace Chesmore, Kevin Crowley, Nicholas Galitzki, Jon Gudmundsson, Kathleen Harrington, Bradley Johnson, J. Lloyd, Amber Miller, Max Silva-Feaver

Proceedings Volume 13094, 130945M (2024) https://doi.org/10.1117/12.3019416

KEYWORDS: Optical simulations, Holography, Near field, Telescopes, Sensors, Near field optics, Optical testing, Signal detection, Beam analyzers, Staring arrays

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The Simons Observatory is a ground-based telescope array located at an elevation of 5200 meters, in the Atacama Desert in Chile, designed to measure the temperature and polarization of the cosmic microwave background. It comprises four telescopes: three 0.42-meter small aperture telescopes (SATs), focused on searching for primordial gravitational waves, and one 6-meter large aperture telescope, focused on studying small-scale perturbations. Each of the SATs will field over 12,000 TES bolometers, with two SATs sensitive to both 90 and 150GHz frequency bands (SAT-MF1, and SAT-MF2), while the third SAT is sensitive to 220 and 280GHz frequency bands. Prior to its deployment in 2023, the optical properties of SAT-MF1 were characterized in the laboratory. We report here on measurements of beam maps acquired using a thermal source on SAT-MF1, along with measurements of near-field beam maps using a holographic method that enables characterization of both the amplitude and phase of the beam response, yielding an estimate of the far-field radiation pattern received by the telescope. We find that the near-field half-width-half-maximum (HWHM) requirements are met across the focal plane array for the 90GHz frequency band, and through most of the focal plane array for the 150GHz frequency band. Namely, the mean of the bandpass averaged HWHM of the edge-detector universal focal plane modules match the simulated HWHM to 10.4%, with the discrepancy caused by fringing in the simulation. The measured radial profile of the beams matches simulations to within 2dB from the beam center to at least the -10dB level. Holography estimates of the far-field 90GHz beams match the full-width-half-maximum from simulation within 1%, and the beam radial profiles deviate by less than 2dB inside the central lobe. The success of the holography and thermal beam map experiments confirmed the optical performance were sufficient to meet the science requirements. SAT-MF1 was deployed to Chile in June, 2023. On-site observations are currently underway.

Proceedings Article | 31 August 2022 Presentation + Paper

Conceptual design of the modular detector and readout system for the CMB-S4 survey experiment

D. Barron, Z. Ahmed, J. Aguilar, A. Anderson, C. Baker, P. Barry, J. Beall, A. Bender, B. Benson, R. Besuner, T. Cecil, C. Chang, S. Chapman, G. Chesmore, G. Derylo, W. Doriese, S. Duff, T. Elleflot, J. Filippini, B. Flaugher, J. Gomez, P. Grimes, R. Gualtieri, I. Gullett, G. Haller, S. Henderson, D. Henke, R. Herbst, A. Huber, J. Hubmayr, M. Jonas, J. Joseph, C. King, J. Kovac, D. Kubik, M. Lisovenko, J. McMahon, L. Moncelsi, J. Nagy, B. Osherson, B. Reese, J. Ruhl, L. Sapozhnikov, A. Schillaci, S. Simon, A. Suzuki, G. Wang, B. Westbrook, V. Yefremenko, J. Zhang

Proceedings Volume 12190, 121900B (2022) https://doi.org/10.1117/12.2630494

KEYWORDS: Sensors, Prototyping, Superconductors, Bolometers, Time division multiplexing, Electronics, Wafer-level optics, Multiplexing, Silicon

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Proceedings Article | 29 August 2022 Poster

In-lab performance validation of the Simons Observatory Large Aperture Telescope optics tubes

Carlos Sierra, Kathleen Harrington, Tommy Alford, Grace Chesmore, Shreya Sutariya, Jeffrey McMahon

Proceedings Volume PC12190, PC121901L (2022) https://doi.org/10.1117/12.2630573

KEYWORDS: Telescopes, Observatories, Sensors, Microwave radiation, Receivers, Optical testing, Interfaces, Control systems

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Proceedings Article | 29 August 2022 Poster

Advanced ACTPol: Calibrating Fourier-Transform Spectrometer Bandpass Measurements

Thomas Alford, Rahul Datta, Shreya Sutariya, Grace Chesmore, Carlos Sierra, Kathleen Harrington, Jeffrey McMahon

Proceedings Volume PC12190, PC1219021 (2022) https://doi.org/10.1117/12.2630566

KEYWORDS: Spectroscopy, Calibration, Spectral calibration, Fourier transforms, Telescopes, Precision measurement, Optical simulations, Microwave radiation

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Proceedings Article | 29 August 2022 Poster

The Simons Observatory: Band-Pass calibration using a Frequency-tunable Laser Source (FLS)

Shreya Sutariya, Kathleen Harrington, Thomas Alford, Carlos Sierra, Grace Chesmore, Jeff McMahon, Kirit Karkare, Ryan McGeehan

Proceedings Volume PC12190, PC121901J (2022) https://doi.org/10.1117/12.2629742

KEYWORDS: Calibration, Observatories, Laser sources, Telescopes, Sensors, Microwave radiation, Fourier transforms, Terahertz radiation, Spectrometers, Spectral calibration

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Proceedings Article | 29 August 2022 Poster

The Simons Observatory: Receiver Characterization with Radio Holography

Grace Chesmore, Kathleen Harrington, Tommy Alford, Carlos Sierra, Shreya Sutariya, Jeff McMahon

Proceedings Volume PC12190, PC121901M (2022) https://doi.org/10.1117/12.2626616

KEYWORDS: Telescopes, Receivers, Observatories, Holography, Near field, Diffraction, Systems modeling, Statistical analysis, Radio propagation, Particles

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Proceedings Article | 31 December 2020 Presentation + Paper

The integration and testing program for the Simons Observatory Large Aperture Telescope optics tubes

Kathleen Harrington, Carlos Sierra, Grace Chesmore, Shreya Sutariya, Aamir Ali, Steve Choi, Nicholas Cothard, Simon Dicker, Nicholas Galitzki, Shuay-Pwu Patty Ho, Anna Kofman, Brian Koopman, Jack Lashner, Jeff McMahon, Michael Niemack, John Orlowski-Scherer, Joseph Seibert, Max Silva-Feaver, Eve Vavagiakis, Zhilei Xu, Ningfeng Zhu

Proceedings Volume 11453, 1145318 (2020) https://doi.org/10.1117/12.2562647

KEYWORDS: Telescopes, Observatories, Integrated optics, Wafer-level optics, Sensors, Cryogenics, Optical fabrication, Microwave radiation, Bolometers, Receivers

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Proceedings Article | 16 December 2020 Poster + Presentation + Paper

Design and fabrication of metamaterial anti-reflection coatings for the Simons Observatory

Joseph Golec, Jeffrey McMahon, Aamir Ali, Grace Chesmore, Leah Cooperrider, Simon Dicker, Nicholas Galitzki, Kathleen Harrington, Rebecca Jackson, Benjamin Westbrook, Edward Wollack, Zhilei Xu, Ningfeng Zhu

Proceedings Volume 11451, 114515T (2020) https://doi.org/10.1117/12.2561720

KEYWORDS: Metamaterials, Observatories, Antireflective coatings, Optics manufacturing, Telescopes, Microwave radiation, Sensors, Bolometers, Optical coatings, Silicon

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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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