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KASCADE-GRANDE: a conclusive experiment on the knee

We present the status and capabilities of the Extensive Air Shower experiment (KASCADE-Grande) which is being realized at Forschungszentrum Karlsruhe through a large collecting area (0.5 km ) electromagnetic array (Grande) that will operate jointly with the existing KASCADE detectors. KASCADE-Grande will cover the primary energy range10 eV < E0 < 10 eV, overlapping with KASCADE around10 eV, thus providing a continuous information from3 · 10 eV to 10 eV. The main task of the experiment is the observation of the ”iron knee” in the cosmic ray spectrum that is expected at E k ≈ 10 eV. This is expected following the increasing mass of the primaries observed between10 and10 eV (knee region for the light component), and the rigidity dependent breaks for the spectra of different primaries from the conventional acceleration models. Its observation will provide a definite proof of the knee structure.