Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 14: Poster Session: Instrumentation and Applications

HK 14.15: Poster

Tuesday, March 12, 2002, 10:30–12:45, Foyer Chemie

X-ray diagnostics and calibration of the COMPASS straw detectors — •Klaus Platzer¹, Wolfgang Duennweber¹, and Hermann Wellenstein² — ¹Sektion Physik der LMU, Am Coulombwall 1, 85748 Garching — ²Physics Department, Brandeis University, Waltham MA 02454

A scanning device consisting of a continuous beam, 50kV X-ray tube and a 20mm x 30mm CCD has been installed for the inspection of the straw tracking system of the COMPASS experiment at CERN. One double layer of about 800 straws, covering an area of 3.2m x 2.7m, is scanned in about 30 hours. The result is a grid of 5000 wire positions. The control of wire and wall spacing is possible with a local resolution better than 5 µm. The absolute wire positions are determined with an accuracy of about 50 µm, wich is sufficient as compared with the particle tracking resolution of about 200 µm of a single straw.