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We present simulations of a large array of imaging atmospheric Cherenkovtelescopes (IACTs), for which the size of the array footprint is much largerthan the size of the Cherenkov lightpool. To evaluate limitations of theimaging atmospheric Cherenkov technique, the array is simulated under theassumption of ideal optics, having infinite resolution of the photon arrivaldirection, which makes our conclusions independent of any particular telescopeimplementation. The primary characteristics of the array performance, gamma-raytrigger efficiency, photon energy at the peak of the detection rate, andangular resolution are calculated as a function of the parameters of the array:telescope spacing, telescope aperture, and camera pixelation. We discussimplication of the results for the design of the next generation ground-basedgamma-ray observatory.

The performance of an idealized large-area array of moderate-sized IACTs