Calibration System for the Silicon Drift Detector of the ALICE Experiment

Physics – Medical Physics

Scientific paper

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Scientific paper

During beam tests of large area silicon drift detectors (SDD), it has been observed that the reconstructed position is affected by inhomogeneities in silicon doping. Such deviations, if not corrected, would introduce errors dominating the position resolution and would jeopardize the detector performance. A laser system has been therefore developed to measure these deviations in detail for the 260 SDDs which will be used in the ALICE experiment. This system allows to extract with precision the fluctuations in resistivity and other systematic errors in the spatial measurements and to check the consistency between laser and beam test results. A method has been devised to drastically compress the data on deviations without affecting noticeably the resolution.

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