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We report on the design and performance of the BICEP3 instrument and itsfirst three-year data set collected from 2016 to 2018. BICEP3 is a 52cmaperture, refracting telescope designed to observe the polarization of thecosmic microwave background (CMB) on degree angular scales at 95GHz. It startedscience observation at the South Pole in 2016 with 2400 antenna-coupledtransition-edge sensor (TES) bolometers. The receiver first demonstrated newtechnologies such as large-diameter alumina optics, Zotefoam infrared filters,and flux-activated SQUIDs, allowing $\sim 10\times$ higher optical throughputcompared to the Keck design. BICEP3 achieved instrument noise-equivalenttemperatures of 9.2, 6.8 and 7.1$\mu\text{K}_{\text{CMB}}\sqrt{\text{s}}$ andreached Stokes $Q$ and $U$ map depths of 5.9, 4.4 and 4.4$\mu$K-arcmin in 2016,2017 and 2018, respectively. The combined three-year data set achieved apolarization map depth of 2.8$\mu$K-arcmin over an effective area of 585 squaredegrees, which is the deepest CMB polarization map made to date at 95GHz.

BICEP / Keck XV: The BICEP3 CMB Polarimeter and the First Three Year Data Set