Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.77: Poster

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

RESULTS OF THE COSMIC-RAY TRACKING WITH STRAW DETECTOR PROTOTYPE — •Aziz Ucar, K. Kilian, R. Nellen, J. Ritman, T. Sefzick, and P. Wintz — Forschungszentrum Juelich, 52425 Juelich

A new straw tube tracking detector for the COSY time of flight (TOF) detector system is under construction. The detector will consist of more than 3000 straws with 1 cm diameter and 30 micron Mylar wall thickness. The active area of the tracker is 1 m² with a depth of 30 cm. Using gas overpressure to provide mechanical stability eliminates the necessity of a massive surrounding frame, the final tracker will have a total weight less than 15 kg. A prototype of the straw tracker, consisting of four double planes, is constructed for 3 dimensional tracking and testing some detector elements. The electronic part of the prototype is studied to get rid of oscillations caused by the ASD-8 chip. By modifying some passive elements (capacitors, resistors) on the input board to the ASD-8 chip, a stable and oscillation free state in electronic part is obtained. First spatial resolution and efficiency values of the tracker from cosmic-rays will be presented.