Erlangen 2001 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 9: Postersitzung: Instrumentation und Anwendungen

HK 9.2: Poster

Dienstag, 20. März 2001, 10:30–12:45, R

Calibration Strategy and Performance of the HADES Drift Chamber Tracking System^* — •Peter Zumbruch¹, Hejdar Agakichiev¹, Denis Bertini¹, Jaroslav Bielcik¹, Ilse Koenig¹, Daniel J. Magestro¹, Jochen Markert², Christian Müntz², Klaus Rosenkranz¹, Joachim Stroth^1,2, Vladimir Pechenov¹, and Jörn Wüstenfeld² — ¹Gesellschaft für Schwerionenforschung, Darmstadt, Germany — ²Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Germany

HADES is a second generation dilepton spectrometer presently being commissioned at GSI Darmstadt. The momentum measurement of charged particles emitted from the target is performed by a superconducting toroidial shaped magnet and a tracking system. This system consists of drift chamber modules (MDC) of high granularity arranged in six sectors with two modules before and after the magnet, respectively. Overall the system covers the full azimuthal angle and 18 - 85 degrees in the polar angle. The experiment will need an invariant mass resolution of 1% in the omega meson mass region. This requires a spatial resolution of better than 70 µ m per detector module.

In this contribution strategies for the calibration to provide this accuracy will be discussed. Corresponding results gained in several commissioning runs over the last year have been analyzed. The presently analyzed results show that the anticipated performance can be achieved.

^*supported by:

GSI, BMBF, DFG, INTAS, EC