Abstract
The new High Acceptance Di- Electron Spectrometer HADES is presently being set up and commissioned at GSI/Darmstadt. It is designed to the understanding of both, in-medium properties of mesons as well as fundamental electro-magnetic properties of hadrons by means of electron pair spectroscopy. During 1999 the detector system will be gradually completed and the physics program will start. This contribution briefly recalls the design of the spectrometer, covering the toroidal super-conducting magnet and the main detector components: the RICH, four planes of low-mass drift chambers MDC, TOF and PreShower detectors. Emphasis is put on the latest results on detector performance studied during in-beam test experiments. The results proof that in the environment of relativistic heavy ion collisions the combined electron identification capability of all detector prototypes satisfies the design values.
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