München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.75: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Large Tracking Detector in Vacuum Consisting of Self-Supporting Straw Tubes — •Peter Wintz — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
The detector consists of 3100 straw drift tubes, made of 30µ m thin, aluminised mylar film with a length of 1m and diameter of 10 mm. The tubes are arranged in vertical double-layers at three different azimuthal orientations, close behind the target in the existing COSY-TOF spectrometer. The new technology of intrinsic wire tension and tube stretching avoids any tube reinforcement or support structures. Therefore, overall detector weight (≃ 15 kg) and material thickness (X/X0 ≃ 1.3%) are close to the absolute minimum. The high-rate performance was tested using COSY-beams with particle intensities up to 5× 106s−1 and charge loads up to about 1 C/cm in single straws. Using cosmic ray tracks a mean spatial resolution of σrφ ≃ 100µ m and detection efficiency up to 98% were measured.
Project is supported in part by BMBF and FZ Jülich.