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High-Acceptance Toroidal Spectrometer HADES.
R & D of New Particle Detectors

1. A high-acceptance high-resolution spectrometer for electron pair detection in heavy-ion collisions is under construction at SIS (Darmstadt). The physics motivation includes an investigation of in-medium modification of light vector mesons ( , , ) as well as a study of the dilepton continium below the /-region in hot dense hadronic matter. The main detector components include a ring-imaging Cherenkov detector (RICH) for electron identification, a superconducting magnet with toroidal geometry, a drift chamber system for tracking before and behind the field region and an electron trigger array with time-of-flight measurement and shower detection. The spectrometer has a geometric acceptance of almost 50% for the electron pair and a mass resolution of 0.8% in the /-region. Special attention will be paid to the investigation of different aspects of dilepton and photon radiation from a hot and dense nuclear medium, dilepton sources in nuclear interactions, asymmetry and anisotropy of dielectrons and photons. High-resolution low-mass multilayer drift chambers for the central part of the HADES spectrometer were constructed at VBLHE JINR. The analogue readout electronics with a high density of integration and low power dissipation was developed at VBLHE; mass production of this electronics was carried out for the drift chamber system of the spectrometer. The work on track-finding software in the drift chamber system is in progress.
2. Research and development of transition radiation detectors and X-ray detectors with a high spatial resolution.

• Preparation of the drift chambers for the experiments on proton and pion beams. Further development and application of track-fitting software for the drift chamber system, participation in the experimental programme and data analysis.
  
  
• Testing of the prototypes of transition radiation detectors on the beam.

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