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

Scientific Programme:

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 the 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 geometrical acceptance of almost 50% for electron pair and a mass resolution of 0,8% in /-region. Special attention will be paid to investigation of different aspects of dilepton and photon radiation from a hot and dense nuclear medium, sources of dilepton in nuclear interraction, asymmetry and anisotropy of dielectrons and photons. High-resolution low--mass multilayer drift chambers for the central part of the HADES spectrometer have been constructed at LHE JINR. The analogue readout electronics with the high density of integration and low power dissipation was developed at LHE; 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 spatical resolution.

• Investigation of the drift chamber parameters during the experiments. Further development of track finding and track-fitting software for HADES drift chambers, participation in the experimental programme and data analysis.
  
  
• Investigation of transition radiation detectors and X-ray detector with a high spatial resolution.

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