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New radio data is presented for the rich cluster Abell 2163. The clusterradio emission is characterized by the presence of a radio halo, which is oneof the most powerful and extended halos known so far. In the NE peripheralcluster region, we also detect diffuse elongated emission, which we classify asa cluster relic. The cluster A2163 is very hot and luminous in X-ray. Itscentral region is probably in a highly non relaxed state, suggesting that thiscluster is likely to be a recent merger. The existence of a radio halo in thiscluster confirms that halos are associated with hot massive clusters, andconfirms the connection between radio halos and cluster merger processes. Thecomparison between the radio emission of the halo and the cluster X-rayemission shows a close structural similarity. A power law correlation is foundbetween the radio and X-ray brightness, with index = 0.64. We also report theupper limit to the hard X-ray emission, obtained from a BeppoSAX observation.We discuss the implications of our results.Comment: 7 pages, 8 figures (5 in ps and 3 in gif), Accepted for publication  in Astron. Astrop

The giant radio halo in Abell 2163