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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 the investigation of in-medium modification of light vector mesons ( , , ) as well as the 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 the geometric acceptance of almost 50% for the electron pair and a mass resolution of 1.0% 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 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 and data analysis are in progress.
   
   
2. Research and development of new Position Sensitive Detectors with high spatial resolution.

• Further development and application of the track-fitting software for the drift chamber system, participation in the experimental programme and data analysis.
  
  
• Design of new drift chambers for plane 1 of HADES spectrometer.
  
  
• R&D on fast gas detector; tests in the laboratory conditions and accelerators.

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