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Characterise the large-scale structure in the Universe from present times tothe high redshift epoch of reionisation is essential to constraining thecosmology, the history of star formation and reionisation, measuring the gascontent of the Universe and obtaining a better understanding of the physicalprocess that drive galaxy formation and evolution. Using the integratedemission from unresolved galaxies or gas clouds, line intensity mapping (LIM)provides a new observational window to measure the larger properties ofstructure. This very promising technique motivates the community to plan forLIM experiments.  We describe the development of a large field-of-view instrument, namedCONCERTO, operating in the range 130-310 GHz from the APEX 12-meters telescope.CONCERTO is a low-resolution spectrometer based on the Lumped Element KineticInductance Detectors technology. Spectra are obtained using a fast FourierTransform Spectrometer (FTS), coupled to a dilution cryostat with basetemperature of 0.1K. Two 2 kilo-pixels arrays of LEKID are mounted inside thecryostat that also contains the cold optics and the front-end electronics.  We present in detail the technological choices leading to the instrumentalconcept, together with the design and fabrication of the instrument andpreliminary laboratory tests on the detectors. We also give our best estimatesof CONCERTO sensitivity and give predictions for two of the main scientificgoals of CONCERTO, i.e. a [CII]-intensity mapping survey and observations ofgalaxy clusters.  We provide a detail description of the instrument design. Based on realisticcomparisons with existing instruments developed by our group (NIKA, NIKA2, andKISS), and on laboratory detectors characterisation, we provide an estimate ofCONCERTO sensitivity on sky. Finally, we describe in detail two out of the mainscience goals offered by CONCERTO at APEX.

A wide field-of-view low-resolution spectrometer at APEX: instrument design and science forecast