Münster 2002 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 14: Poster Session: Instrumentation and Applications
HK 14.6: Poster
Tuesday, March 12, 2002, 10:30–12:45, Foyer Chemie
Status of the HADES detector alignment — •Alexandre Sadovski1, H. Agakichiev2, H. Alvarez-Pol3, I. Duran3, B. Fuentes3, J. A. Garzon3, W. König2, R. Kotte1, V. Pechenov4, M. Sanchez3, and P. Zumbruch2 — 1Forschungszentrum Rossendorf, Institut für Kern- und Hadronenphysik, Dresden, Germany — 2GSI Darmstadt, Germany — 3Universidade de Santiago de Compostela, Spain — 4Joint Institute of Nuclear Research, Dubna, Russia
The accurate determination of the masses of various vector mesons decaying into e+e− pairs is among the physics goals of the starting HADES experiments at SIS/GSI Darmstadt. This requires an overall invariant mass resolution of about 1 %. To achieve the corresponding momentum resolution a precise knowledge of the detector position is needed. A common way to do this is to correct (align) for possible deviations from the nominal positions using calibration data and the knowledge of the detector’s geometry. Several alignment procedures have been developed and tested using tracks from data on heavy-ion collisions aquired during several data taking periods. Alignment corrections for the multiwire drift chamber (MDC) positions have been found. Checks for MDC alignments have been developed and successfully applied. The methods and results used will be presented and surveyed.