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HiPERCAM is a portable, quintuple-beam optical imager that saw first light onthe 10.4-m Gran Telescopio Canarias (GTC) in 2018. The instrument usesre-imaging optics and 4 dichroic beamsplitters to record $u_s g_s r_s i_s z_s$($320-1060$ nm) images simultaneously on its five CCD cameras, each of 3.1arcmin (diagonal) field of view. The detectors in HiPERCAM are frame-transferdevices cooled thermo-electrically to 183 K, thereby allowing bothlong-exposure, deep imaging of faint targets, as well as high-speed (over 1000windowed frames per second) imaging of rapidly varying targets. Acomparison-star pick-off system in the telescope focal plane increases theeffective field of view to 6.7 arcmin for differential photometry. CombiningHiPERCAM with the world's largest optical telescope enables the detection ofastronomical sources to $g_s \sim 23$ in 1 s and $g_s \sim 28$ in 1 h. In thispaper we describe the scientific motivation behind HiPERCAM, present itsdesign, report on its measured performance, and outline some plannedenhancements.

HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias