Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 41: Instrumentation und Anwendungen

HK 41.5: Talk

Wednesday, March 9, 2005, 15:00–15:15, TU MA041

Performance of the HADES Tracking System in experiment and simulation — •Yvonne Pachmayer — Institut für Kernphysik, Univ. Frankfurt, Germany

The High Acceptance Di-Electron Spectrometer (HADES) operational at GSI is designed to study electron pair emission in collisions of heavy ions and elementary reactions in the 1-2 AGeV incident energy range. Good invariant mass resolution or equivalently high momentum resolution require a high precision tracking system. The pair detection efficiency is maximized by covering polar angles from 18^o to 85^o and practically the full azimuth. The tracking system is composed of 24 low-mass, high-granular multiwire drift chambers, which provide an active area of 30m² and are positioned before and after the magnetic field. The low-mass constraint on the active area is ensured by using Helium-based gas mixtures and Aluminum cathode and field wires. It will be demonstrated that the design goal of 150 µm for the intrinsic spatial resolution compares well with the results from in-beam data from C+C and p+p collisions.