School of Physics - Research Publications

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    The Simons Observatory: Overview of data acquisition, control, monitoring, and computer infrastructure
    Koopman, BJ ; Lashner, J ; Saunders, LJ ; Hasselfield, M ; Bhandarkar, T ; Bhimani, S ; Choi, SK ; Duell, CJ ; Galitzki, N ; Harrington, K ; Hincks, AD ; Ho, S-PP ; Newburgh, L ; Reichardt, CL ; Seibert, J ; Spisak, J ; Westbrook, B ; Xu, Z ; Zhu, N ( 2020-12-18)
    The Simons Observatory (SO) is an upcoming polarized cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope that will observe from the Atacama Desert in Chile. In total, SO will field over 60,000 transition-edge sensor (TES) bolometers in six spectral bands centered between 27 and 280 GHz to achieve the sensitivity necessary to measure or constrain numerous cosmological parameters, including the tensor-to-scalar ratio, effective number of relativistic species, and sum of the neutrino masses. The SO scientific goals require coordination and control of the hardware distributed among the four telescopes on site. To meet this need, we have designed and built an open-sourced platform for distributed system management, called the Observatory Control System (ocs). This control system interfaces with all subsystems including the telescope control units, the microwave multiplexing readout electronics, and the cryogenic thermometry. We have also developed a system for live monitoring of housekeeping data and alerting, both of which are critical for remote observation. We take advantage of existing open source projects, such as crossbar for RPC and PubSub, twisted for asynchronous events, grafana for online remote monitoring, and docker for containerization. We provide an overview of the SO software and computer infrastructure, including the integration of SO-developed code with open source resources and lessons learned while testing at SO labs developing hardware systems as we prepare for deployment.
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    CMB/kSZ and Compton-y Maps from 2500 square degrees of SPT-SZ and Planck Survey Data
    Bleem, LE ; Crawford, TM ; Ansarinejad, B ; Benson, BA ; Bocquet, S ; Carlstrom, JE ; Chang, CL ; Chown, R ; Crites, AT ; de Haan, T ; Dobbs, MA ; Everett, WB ; George, EM ; Gualtieri, R ; Halverson, NW ; Holder, GP ; Holzapfel, WL ; Hrubes, JD ; Knox, L ; Lee, AT ; Luong-Van, D ; Marrone, DP ; McMahon, JJ ; Meyer, SS ; Millea, M ; Mocanu, LM ; Mohr, JJ ; Natoli, T ; Omori, Y ; Padin, S ; Pryke, C ; Raghunathan, S ; Reichardt, CL ; Ruhl, JE ; Schaffer, KK ; Shirokoff, E ; Staniszewski, Z ; Stark, AA ; Vieira, JD ; Williamson, R ( 2021-02-09)
    We present component-separated maps of the primary cosmic microwave background/kinematic Sunyaev-Zel'dovich (SZ) amplitude and the thermal SZ Compton-y parameter, created using data from the South Pole Telescope (SPT) and the Planck satellite. These maps, which cover the ∼2500 square degrees of the Southern sky imaged by the SPT-SZ survey, represent a significant improvement over previous such products available in this region by virtue of their higher angular resolution (1.25 arcminutes for our highest resolution Compton-y maps) and lower noise at small angular scales. In this work we detail the construction of these maps using linear combination techniques, including our method for limiting the correlation of our lowest-noise Compton-y map products with the cosmic infrared background. We perform a range of validation tests on these data products to test our sky modeling and combination algorithms, and we find good performance in all of these tests. Recognizing the potential utility of these data products for a wide range of astrophysical and cosmological analyses, including studies of the gas properties of galaxies, groups, and clusters, we make these products publicly available at this http URL and on the NASA/LAMBDA website.
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    Constraining Cluster Virialization Mechanism and Cosmology using Thermal-SZ-selected clusters from Future CMB Surveys
    Raghunathan, S ; Whitehorn, N ; Alvarez, MA ; Aung, H ; Battaglia, N ; Holder, GP ; Nagai, D ; Pierpaoli, E ; Reichardt, CL ; Vieira, JD ( 2021-07-21)