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We describe the survey design and science goals for ODIN (One-hundred-deg^2DECam Imaging in Narrowbands), a NOIRLab survey using the Dark Energy Camera(DECam) to obtain deep (AB~25.7) narrow-band images over an unprecedented areaof sky. The three custom-built narrow-band filters, N419, N501, and N673, havecentral wavelengths of 419, 501, and 673 nm and respectivefull-widthat-half-maxima of 7.2, 7.4, and 9.8 nm, corresponding to Lya atz=2.4, 3.1, and 4.5 and cosmic times of 2.8, 2.1, and 1.4 Gyr, respectively.When combined with even deeper, public broad-band data from Hyper Suprime-Cam,DECam, and in the future, LSST, the ODIN narrow-band images will enable theselection of over 100,000 Lya-emitting (LAE) galaxies at these epochs.ODIN-selected LAEs will identify protoclusters as galaxy overdensities, and thedeep narrow-band images enable detection of highly extended Lya blobs (LABs).Primary science goals include measuring the clustering strength and dark matterhalo connection of LAEs, LABs, and protoclusters, and their respectiverelationship to filaments in the cosmic web. The three epochs allow theredshift evolution of these properties to be determined during the period knownas Cosmic Noon, where star formation was at its peak. The two narrow-bandfilter wavelengths are designed to enable interloper rejection and furtherscientific studies by revealing [O II] and [O III] at z=0.34, Lya and He II1640 at z=3.1, and Lyman continuum plus Lya at z=4.5. Ancillary scienceincludes similar studies of the lower-redshift emission-line galaxy samples andinvestigations of nearby star-forming galaxies resolved into numerous [O III]and [S II] emitting regions.

The One-hundred-deg^2 DECam Imaging in Narrowbands (ODIN): Survey Design and Science Goals