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SCUBA-2 is an innovative 10000 pixel bolometer camera operating atsubmillimetre wavelengths on the James Clerk Maxwell Telescope (JCMT). Thecamera has the capability to carry out wide-field surveys to unprecedenteddepths, addressing key questions relating to the origins of galaxies, stars andplanets. With two imaging arrays working simultaneously in the atmosphericwindows at 450 and 850 microns, the vast increase in pixel count means thatSCUBA-2 maps the sky 100-150 times faster than the previous SCUBA instrument.In this paper we present an overview of the instrument, discuss the physicalcharacteristics of the superconducting detector arrays, outline the observingmodes and data acquisition, and present the early performance figures on thetelescope. We also showcase the capabilities of the instrument via some earlyexamples of the science SCUBA-2 has already undertaken. In February 2012,SCUBA-2 began a series of unique legacy surveys for the JCMT community. Thesesurveys will take 2.5 years and the results are already providing complementarydata to the shorter wavelength, shallower, larger-area surveys from Herschel.The SCUBA-2 surveys will also provide a wealth of information for further studywith new facilities such as ALMA, and future telescopes such as CCAT and SPICA.

SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope