The mm-wavelength sky reveals the initial phase of structure formation, at all spatial scales, over the entire observable history of the Universe. Over the past 20 years, advances in mm-wavelength detectors and camera systems have allowed the field to take enormous strides forward – particularly in the study of the Cosmic Microwave Background – but limitations in mapping speeds, sensitivity and resolution have plagued studies of astrophysical phenomena. In fact, limitations due to inherent biases in the ground-based mm-wavelength surveys conducted over the last 2 decades continue to motivate the need for deeper and wider-area maps made with increased angular resolution. TolTEC is a new camera that will fill the focal plane of the 50m diameter Large Millimeter Telescope (LMT) and provide simultaneous, polarization-sensitive imaging at 2.0, 1.4, and 1.1mm wavelengths. The instrument, now under construction, is a cryogenically cooled receiver housing three separate kilo-pixel arrays of Kinetic Inductance Detectors (KIDs) that are coupled to the telescope through a series of silicon lenses and dichroic splitters. TolTEC will be installed and commissioned on the LMT in early 2019 where it will become both a facility instrument and also perform a series of 100 hour “Legacy Surveys” whose data will be publicly available. The initial four surveys in this series: the Clouds to Cores Legacy Survey, the Fields in Filaments Legacy Survey, the Ultra-Deep Legacy Survey and the Large Scale Structure Survey are currently being defined in public working groups of astronomers coordinated by TolTEC Science Team members. Data collection for these surveys will begin in late 2019 with data releases planned for late 2020 and 2021. Herein we describe the instrument concept, provide performance data for key subsystems, and provide an overview of the science, schedule and plans for the initial four Legacy Survey concepts.

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Grant W. Wilson, Peter Ade, Itziar Aretxaga, Jason E. Austermann, Joseph Bardin, Peter Barry, James Beall, Marc Berthoud, Alan Braeley, Sean A. Bryan, Alexandra Burkott, John Bussan, Edgar Castillo, Miguel Chavez, Natalie DeNigris, Simon Doyle, Miranda Eiben, Daniel Ferrusca, Laura Fissel, Jiansong Gao, Walter Gear, Victor Gómez, Sam Gordon, Chris Groppi, Robert Gutermuth, Mark Heyer, Stephen Kuczarski, Mohsen Hosseini, Stella Offner, Alexandra Pope, F. Peter Schloerb, Kamal Souccar, Yuping Tang, Gary Wallace, Min S. Yun, Phillip Mauskopf, Rhys Kelso, Jacob Knapp, Emily Lunde, Hamdi Mani, Justin Mathewson, Evan Scannapieco, Matt Underhill, Johannes Hubmayr, Michael Vissers, David H. Hughes, Ivan Rodriguez Montoya, David Sanchez, Miguel Velazquez, Salvador Ventura, Enzo Pascale, Sam Rowe, Carole Tucker, Giles Novak, Jeff McMahon, and Sara Simon, "The TolTEC project: a millimeter wavelength imaging polarimeter (Conference Presentation)," Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107080I (Presented at SPIE Astronomical Telescopes + Instrumentation: June 13, 2018; Published: 10 July 2018); https://doi.org/10.1117/12.2313347.5807230692001.