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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.83: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

Alignment of the HADES Spectrometer — •Alexander Schmah¹, Geydar Agakichiev², Yvonne Pachmayer³, Vladimir Pechenov², and Anar Rustamov¹ — ¹Gesellschaft für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany — ²II. Physikalisches Institut, University of Gießen, Heinrich-Buff-Ring 16, 35392 Gießen — ³Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt 60486 Frankfurt, Germany

Varios alignment methods for the HADES detector system have been investigated. Data from measuring straight tracks (without magnetic field), cosmic rays as well as proton - proton elastic scattering are used. A new approach has been developped using the hit information of the multi wire drift chambers (MDC). For each iteration of the MDC geometry the full tracking procedure is performed. This allows to modify and correct not only the position of chambers in space but also the internal geometry of the chambers. A simultaneous fit of tracks in all chambers is employed which has the potential to significantly enhance the accuracy of alignment. This method allows to align the chambers not only with respect to each other but also with respect to the target point. This work has been supported by BMBF and GSI.