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Upcoming observations from the Simons Observatory have been projected to constrain the tensor-to-scalar ratio, $r$, at the level of $\sigma(r)=$0.003. Here we describe one of the forecasting algorithms for the Simons Observatory in more…

Cosmology and Nongalactic Astrophysics · Physics 2019-05-23 Ben Thorne , Jo Dunkley , David Alonso , Maximilian H. Abitbol , Josquin Errard , J. Colin Hill , Brian Keating , Grant Teply , Edward J. Wollack

We use a custom-made calibrator to measure individual detectors' polarization angles of BICEP3, a small aperture telescope observing the cosmic microwave background (CMB) at 95GHz from the South Pole. We describe our calibration strategy…

WIRC+Pol is a near-infrared low-resolution spectropolarimeter on the 200-inch Telescope at Palomar Observatory. The instrument utilizes a polarization grating to perform polarimetric beam splitting and spectral dispersion simultaneously. It…

The Simons Observatory (SO) is a ground-based cosmic microwave background instrument to be sited in the Atacama Desert in Chile. SO will deploy 60,000 transition-edge sensor bolometers in 49 separate focal-plane modules across a suite of…

Future Cosmic Microwave Background (CMB) satellite missions aim at using the B-mode polarisation signal to measure the tensor-to-scalar ratio $r$ with a sensitivity $\sigma(r)$ of the order of $\leq 10^{-3}$. Small uncertainties in the…

Instrumentation and Methods for Astrophysics · Physics 2019-08-07 Ranajoy Banerji , Guillaume Patanchon , Jacques Delabrouille , Masashi Hazumi , Duc Thuong Hoang , Hirokazu Ishino , Tomotake Matsumura

The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert in Chile that promises to provide breakthrough discoveries in fundamental physics, cosmology, and…

Instrumentation and Methods for Astrophysics · Physics 2019-10-10 The Simons Observatory Collaboration , Maximilian H. Abitbol , Shunsuke Adachi , Peter Ade , James Aguirre , Zeeshan Ahmed , Simone Aiola , Aamir Ali , David Alonso , Marcelo A. Alvarez , Kam Arnold , Peter Ashton , Zachary Atkins , Jason Austermann , Humna Awan , Carlo Baccigalupi , Taylor Baildon , Anton Baleato Lizancos , Darcy Barron , Nick Battaglia , Richard Battye , Eric Baxter , Andrew Bazarko , James A. Beall , Rachel Bean , Dominic Beck , Shawn Beckman , Benjamin Beringue , Tanay Bhandarkar , Sanah Bhimani , Federico Bianchini , Steven Boada , David Boettger , Boris Bolliet , J. Richard Bond , Julian Borrill , Michael L. Brown , Sarah Marie Bruno , Sean Bryan , Erminia Calabrese , Victoria Calafut , Paolo Calisse , Julien Carron , Fred. M Carl , Juan Cayuso , Anthony Challinor , Grace Chesmore , Yuji Chinone , Jens Chluba , Hsiao-Mei Sherry Cho , Steve Choi , Susan Clark , Philip Clarke , Carlo Contaldi , Gabriele Coppi , Nicholas F. Cothard , Kevin Coughlin , Will Coulton , Devin Crichton , Kevin D. Crowley , Kevin T. Crowley , Ari Cukierman , John M. D'Ewart , Rolando Dünner , Tijmen de Haan , Mark Devlin , Simon Dicker , Bradley Dober , Cody J. Duell , Shannon Duff , Adri Duivenvoorden , Jo Dunkley , Hamza El Bouhargani , Josquin Errard , Giulio Fabbian , Stephen Feeney , James Fergusson , Simone Ferraro , Pedro Fluxà , Katherine Freese , Josef C. Frisch , Andrei Frolov , George Fuller , Nicholas Galitzki , Patricio A. Gallardo , Jose Tomas Galvez Ghersi , Jiansong Gao , Eric Gawiser , Martina Gerbino , Vera Gluscevic , Neil Goeckner-Wald , Joseph Golec , Sam Gordon , Megan Gralla , Daniel Green , Arpi Grigorian , John Groh , Chris Groppi , Yilun Guan , Jon E. Gudmundsson , Mark Halpern , Dongwon Han , Peter Hargrave , Kathleen Harrington , Masaya Hasegawa , Matthew Hasselfield , Makoto Hattori , Victor Haynes , Masashi Hazumi , Erin Healy , Shawn W. Henderson , Brandon Hensley , Carlos Hervias-Caimapo , Charles A. Hill , J. Colin Hill , Gene Hilton , Matt Hilton , Adam D. Hincks , Gary Hinshaw , Renée Hložek , Shirley Ho , Shuay-Pwu Patty Ho , Thuong D. Hoang , Jonathan Hoh , Selim C. Hotinli , Zhiqi Huang , Johannes Hubmayr , Kevin Huffenberger , John P. Hughes , Anna Ijjas , Margaret Ikape , Kent Irwin , Andrew H. Jaffe , Bhuvnesh Jain , Oliver Jeong , Matthew Johnson , Daisuke Kaneko , Ethan D. Karpel , Nobuhiko Katayama , Brian Keating , Reijo Keskitalo , Theodore Kisner , Kenji Kiuchi , Jeff Klein , Kenda Knowles , Anna Kofman , Brian Koopman , Arthur Kosowsky , Nicoletta Krachmalnicoff , Akito Kusaka , Phil LaPlante , Jacob Lashner , Adrian Lee , Eunseong Lee , Antony Lewis , Yaqiong Li , Zack Li , Michele Limon , Eric Linder , Jia Liu , Carlos Lopez-Caraballo , Thibaut Louis , Marius Lungu , Mathew Madhavacheril , Daisy Mak , Felipe Maldonado , Hamdi Mani , Ben Mates , Frederick Matsuda , Loïc Maurin , Phil Mauskopf , Andrew May , Nialh McCallum , Heather McCarrick , Chris McKenney , Jeff McMahon , P. Daniel Meerburg , James Mertens , Joel Meyers , Amber Miller , Mark Mirmelstein , Kavilan Moodley , Jenna Moore , Moritz Munchmeyer , Charles Munson , Masaaki Murata , Sigurd Naess , Toshiya Namikawa , Federico Nati , Martin Navaroli , Laura Newburgh , Ho Nam Nguyen , Andrina Nicola , Mike Niemack , Haruki Nishino , Yume Nishinomiya , John Orlowski-Scherer , Luca Pagano , Bruce Partridge , Francesca Perrotta , Phumlani Phakathi , Lucio Piccirillo , Elena Pierpaoli , Giampaolo Pisano , Davide Poletti , Roberto Puddu , Giuseppe Puglisi , Chris Raum , Christian L. Reichardt , Mathieu Remazeilles , Yoel Rephaeli , Dominik Riechers , Felipe Rojas , Aditya Rotti , Anirban Roy , Sharon Sadeh , Yuki Sakurai , Maria Salatino , Mayuri Sathyanarayana Rao , Lauren Saunders , Emmanuel Schaan , Marcel Schmittfull , Neelima Sehgal , Joseph Seibert , Uros Seljak , Paul Shellard , Blake Sherwin , Meir Shimon , Carlos Sierra , Jonathan Sievers , Cristobal Sifon , Precious Sikhosana , Maximiliano Silva-Feaver , Sara M. Simon , Adrian Sinclair , Kendrick Smith , Wuhyun Sohn , Rita Sonka , David Spergel , Jacob Spisak , Suzanne T. Staggs , George Stein , Jason R. Stevens , Radek Stompor , Aritoki Suzuki , Osamu Tajima , Satoru Takakura , Grant Teply , Daniel B. Thomas , Ben Thorne , Robert Thornton , Hy Trac , Jesse Treu , Calvin Tsai , Carole Tucker , Joel Ullom , Sunny Vagnozzi , Alexander van Engelen , Jeff Van Lanen , Daniel D. Van Winkle , Eve M. Vavagiakis , Clara Vergès , Michael Vissers , Kasey Wagoner , Samantha Walker , Yuhan Wang , Jon Ward , Ben Westbrook , Nathan Whitehorn , Jason Williams , Joel Williams , Edward Wollack , Zhilei Xu , Siavash Yasini , Edward Young , Byeonghee Yu , Cyndia Yu , Fernando Zago , Mario Zannoni , Hezi Zhang , Kaiwen Zheng , Ningfeng Zhu , Andrea Zonca

The Simons Observatory (SO) is a next-generation ground-based telescope located in the Atacama Desert in Chile, designed to map the cosmic microwave background (CMB) with unprecedented precision. The observatory consists of three small…

Precision measurements of the polarization of the cosmic microwave background (CMB) radiation, especially experiments seeking to detect the odd-parity "B-modes", have far-reaching implications for cosmology. To detect the B-modes generated…

Cosmology and Nongalactic Astrophysics · Physics 2012-12-27 Brian Keating , Meir Shimon , Amit Yadav

The Simons Observatory (SO) is a cosmic microwave background instrumentation suite in the Atacama Desert of Chile. More than 65,000 polarization-sensitive transition-edge sensor (TES) bolometers will be fielded in the frequency range…

Polarization leakage of foreground synchrotron emission is a critical issue in HI intensity mapping experiments. While the sought-after HI emission is unpolarized, polarized foregrounds such as Galactic and extragalactic synchrotron…

Instrumentation and Methods for Astrophysics · Physics 2016-12-28 Yu-Wei Liao , Tzu-Ching Chang , Cheng-Yu Kuo , Kiyoshi Wesley Masui , Niels Oppermann , Ue-Li Pen , Jeffrey B. Peterson

(Abridged) Despite the great success of precision cosmology, cosmologists cannot fully explain the initial conditions of the Universe. Inflation, an exponential expansion in the first 10^-36s, is a promising potential explanation. A generic…

Instrumentation and Methods for Astrophysics · Physics 2012-09-07 Immanuel Buder

We present the design methodology and characterization of a superconducting magnetic bearing (SMB) system for the polarization modulator in the SAT-LF, one of the small aperture telescopes (SATs) in the Simons Observatory (SO) that is…

Instrumentation and Methods for Astrophysics · Physics 2025-03-31 Daichi Sasaki , Junna Sugiyama , Kyohei Yamada , Bryce Bixler , Yuki Sakurai , Kam Arnold , Bradley R. Johnson , Akito Kusaka

The Simons Observatory (SO) will measure the cosmic microwave background (CMB) in both temperature and polarization over a wide range of angular scales and frequencies from 27-270 GHz with unprecedented sensitivity. One technology for…

The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe from the Atacama Desert in Chile. In total, SO will field…

We present updated forecasts for the scientific performance of the degree-scale (0.5 deg FWHM at 93 GHz), deep-field survey to be conducted by the Simons Observatory (SO). By 2027, the SO Small Aperture Telescope (SAT) complement will be…

Cosmology and Nongalactic Astrophysics · Physics 2025-12-19 The Simons Observatory Collaboration , I. Abril-Cabezas , S. Adachi , P. Ade , A. E. Adler , P. Agrawal , J. Aguirre , S. Aiola , T. Alford , A. Ali , D. Alonso , M. A. Alvarez , R. An , M. Aravena , K. Arnold , P. Ashton , F. Astori , Z. Atkins , J. Austermann , S. Azzoni , C. Baccigalupi , D. Baker , R. Balafendiev , A. Baleato Lizancos , D. Barron , P. Barry , J. Bartlett , A. Basyrov , N. Battaglia , E. S. Battistelli , R. Battye , A. Bayer , A. Bazarko , J. A. Beall , R. Bean , D. Beck , S. Beckman , J. Begin , A. Beheshti , B. Beringue , T. Bhandarkar , S. Bhimani , F. Bianchini , E. Biermann , M. Billi , S. Biquard , B. Bixler , L. Bizzarri , S. Boada , D. Boettger , B. Bolliet , J. R. Bond , J. Borrill , J. Borrow , C. Braithwaite , T. L. R. Brien , M. L. Brown , S. M. Bruno , S. Bryan , R. Bustos , H. Cai , E. Calabrese , V. Calafut , F. M. Carl , A. Carones , J. Carron , A. Challinor , E. Chamberlain , P. Chanial , N. Chen , K. Cheung , B. Chiang , Y. Chinone , J. Chluba , H. S. Cho , S. K. Choi , M. Chu , J. Clancy , S. E. Clark , P. Clarke , J. Cleary , D. L. Clements , J. Connors , C. Contaldi , G. Coppi , L. Corbett , N. F. Cothard , W. Coulton , D. Crichton , K. D. Crowley , K. T. Crowley , A. Cukierman , J. M. D'Ewart , K. Dachlythra , O. Darwish , R. Datta , S. Day-Weiss , T. de Haan , S. Desai , M. Devlin , L. Di Mascolo , S. Dicker , K. Ding , C. Doux , P. Dow , S. Doyle , C. J. Duell , S. M. Duff , A. J. Duivenvoorden , J. Dunkley , M. Duparc , D. Dutcher , R. Dünner , M. Edenton , H. El Bouhargani , C. Embil Villagra , J. Errard , G. Fabbian , V. Fanfani , F. Farhadi Khouzani , G. S. Farren , J. Fergusson , S. Ferraro , R. Flauger , M. Forconi , A. Foster , K. Freese , J. C. Frisch , A. Frolov , G. Fuller , N. Galitzki , P. A. Gallardo , G. Galloni , J. T. Galvez Ghersi , K. Ganga , X. Garrido , E. Gawiser , M. Gerbino , R. Gerras , S. Giardiello , A. Gill , V. Gilles , U. Giri , E. Gleave , V. Gluscevic , N. Goeckner-Wald , S. Goldstein , J. E. Golec , S. Gordon , M. Gralla , S. Gratton , D. Green , J. C. Groh , C. Groppi , S. Grubb , Y. Guan , N. Gupta , J. E. Guðmundsson , B. Hadzhiyska , S. Hagstotz , P. Hargrave , S. Haridas , K. Harrington , I. Harrison , M. Hasegawa , M. Hasselfield , V. Haynes , M. Hazumi , A. He , E. Healy , S. W. Henderson , B. S. Hensley , E. Hertig , C. Hervías-Caimapo , M. Higuchi , C. A. Hill , J. C. Hill , M. Hilton , A. D. Hincks , G. Hinshaw , R. Hložek , A. Y. Q. Ho , S. Ho , S. P. Ho , T. D. Hoang , J. Hoh , J. Holder , J. Hood , E. Hornecker , A. L. Hornsby , S. C. Hotinli , Z. Huang , Z. B. Huber , J. Hubmayr , K. Huffenberger , A. Hughes , J. P. Hughes , A. Idicherian Lonappan , M. Ikape , K. Inaba , K. Irwin , J. Iuliano , A. H. Jaffe , B. Jain , D. Jain , H. T. Jense , O. Jeong , A. Johnson , B. R. Johnson , M. Johnson , M. E. Jones , N. Joshi , B. Jost , W. Kabalan , V. Kabra , D. Kaneko , J. Kania , E. D. Karpel , Y. Kasai , N. Katayama , B. Keating , B. Keller , R. Keskitalo , A. A. Khatua , J. Kim , T. Kisner , K. Kiuchi , K. Knowles , A. M. Kofman , Y. Koizumi , B. J. Koopman , A. Kosowsky , R. Kou , N. Krachmalnicoff , D. Kramer , A. Krishak , A. Krolewski , A. Kusaka , A. Kusiak , Y. Kvasiuk , P. La Plante , A. La Posta , A. Laguë , A. Lai , J. Lashner , M. Lattanzi , A. Lee , E. Lee , J. Leech , L. Legrand , C. Lessler , J. S. Leung , A. Lewis , Y. Li , Z. Li , M. Limon , L. Lin , E. Linder , M. Link , J. Liu , Y. Liu , J. Lloyd , J. Lonergan , T. Louis , T. Lucas , M. Ludlam , M. Lungu , M. Lyons , N. MacCrann , A. MacInnis , M. Madhavacheril , D. Mak , F. Maldonado , M. Mallaby-Kay , A. Manduca , A. Mangu , H. Mani , A. S. Maniyar , G. A. Marques , P. Masson , J. Mates , J. Mathewson , T. Matsumura , P. Mauskopf , A. May , N. McCallum , H. McCarrick , F. McCarthy , M. McCulloch , J. McMahon , P. D. Meerburg , Y. Mehta , J. Melin , E. Meulbroek , J. Meyers , A. Middleton , Y. Miki , A. Miller , M. Mirmelstein , Y. Mizozoe , B. Mohammadian , G. Montefalcone , K. Moodley , J. Moore , T. Morris , M. Morshed , T. Morton , E. Moser , T. Mroczkowski , M. Murata , J. Myers , M. Münchmeyer , S. Naess , H. Nakata , T. Namikawa , M. Nashimoto , F. Nati , P. Natoli , M. Negrello , S. K. Nerval , L. Newburgh , D. V. Nguyen , A. Nicola , M. D. Niemack , H. Nishino , Y. Nishinomiya , A. Novelli , S. O'Neill , N. Okumoto , A. Orlando , J. Orlowski-Scherer , L. Pagano , L. A. Page , S. Pandey , A. Papageorgiou , I. Paraskevakos , B. Partridge , D. Patel , R. Patki , S. Paulino Korte , M. Peel , K. Perez Sarmiento , F. Perrotta , P. Phakathi , L. Piccirillo , E. Pierpaoli , T. Pinsonneault-Marotte , G. Pisano , J. Pitocco , D. Poletti , C. Popik , B. Prasad , R. Puddu , G. Puglisi , F. J. Qu , F. Rahman , M. J. Randall , C. Ranucci , C. Raum , R. Reeves , C. L. Reichardt , M. Remazeilles , X. Ren , Y. Rephaeli , D. Riechers , B. Reid Guachalla , A. Rizzieri , J. Robe , M. F. Robertson , N. Robertson , K. Rogers , F. Rojas , A. Romero , E. Rosenberg , A. Rotti , S. Rowe , A. Roy , S. Sadeh , N. Sailer , K. Sakaguri , T. Sakuma , Y. Sakurai , M. Salatino , G. H. Sanders , D. Sasaki , M. Sathyanarayana Rao , T. P. Satterthwaite , L. Saunders , L. Scalcinati , E. Schaan , B. Schmitt , M. Schmittfull , N. Sehgal , J. Seibert , Y. Seino , U. Seljak , S. Shaikh , E. Shaw , P. Shellard , B. Sherwin , M. Shimon , J. E. Shroyer , C. Sierra , J. Sievers , C. Sifón , P. Sikhosana , M. Silva-Feaver , S. M. Simon , A. Sinclair , K. Smith , W. Sohn , X. Song , R. F. Sonka , T. Souverin , J. Spisak , S. T. Staggs , G. Stein , J. R. Stevens , R. Stompor , E. Storer , R. Sudiwala , Y. Sueno , J. Sugiyama , P. Suman , K. M. Surrao , S. Sutariya , A. Suzuki , J. Suzuki , O. Tajima , R. Takaku , S. Takakura , A. Takeuchi , I. Tansieri , A. C. Taylor , G. Teply , T. Terasaki , A. Thomas , D. B. Thomas , R. Thornton , P. Timbie , H. Trac , T. Tsan , E. Tsang King Sang , C. Tucker , J. Ullom , L. Vacher , L. Vale , A. van Engelen , J. Van Lanen , J. van Marrewijk , D. D. Van Winkle , C. Vargas , E. M. Vavagiakis , I. Veenendaal , C. Vergès , A. Villarrubia Aguilar , M. Vissers , M. Viña , K. Wagoner , S. Walker , L. Walters , Y. Wang , B. Westbrook , J. Williams , P. Williams , J. Wilson , H. Winch , E. J. Wollack , K. Wolz , J. Wong , Z. Xu , K. Yamada , E. Young , B. Yu , C. Yu , G. Zagatti , M. Zannoni , W. Zhang , K. Zheng , N. Zhu , A. Zonca , I. Zubeldia

The Simons Observatory (SO), due to start full science operations in early 2025, aims to set tight constraints on inflationary physics by inferring the tensor-to-scalar ratio $r$ from measurements of CMB polarization $B$-modes. Its nominal…

The Simons Observatory (SO) is a cosmic microwave background experiment composed of three 0.42 m Small Aperture Telescopes (SATs) and one 6 m Large Aperture Telescope (LAT) in the Atacama Desert of Chile. The Large Aperture Telescope…