Physics – Medical Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apsp.conf..751s&link_type=abstract
ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 8th Conference. Held 6
Physics
Medical Physics
Scientific paper
A dedicated X-ray tomograph has been developed at CERN to control the required wire placement accuracy of better than 20 μm of the 1200 Monitored Drift Tube Chambers, which make up most of the precision chamber part of the ATLAS muon spectrometer. The tomograph allows the chamber wire positions to be measured with a 2 μm statistical and 2 μm systematic uncertainty over the full chamber cross-section of 2.2m × 0.6m. Consistent chamber production quality over the four year construction phase is ensured with a ~15% sampling rate. We describe all aspects of the X-ray tomograph, concentrating on the technical implementation, measurement methods and the autocalibration method specially developed to achieve and verify such a high accuracy. Tomograph measurements of about 80 of the ~750 MDT chambers so far produced have been essential in assessing the validity and consistency of the various construction procedures.
Andreazza W.
Avramidou R.
Banhidi Zita
Lampl W.
Marchesotti M.
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