EUSO-TA, a JEM-EUSO pathfinder at the Telescope Array site

The detector consists of two Fresnel lenses, 1×1 □m each, with a field of view of 11°×11°, able to focus the ultraviolet light generated by cosmic-ray showers as well as from artificial sources, on a focal surface identical to the ones that will be employed in JEM-EUSO.