Speakers
Description
Beam tests are the standard method for determining the position resolution of detectors. This requires the precise knowledge of the beam-position resolution at the detector to be tested. A method is proposed which achieves this. It uses a segmented silicon detector with normally incident beam. It is found that for normal incidence events with cluster-size 2 have a position accuracy well below 1 μm. The method is first demonstrated with simulated events, which are also used to investigate how to deal with cross-talk, electronics noise, energetic 𝛿-electrons, and incident beams with a few degrees off the normal to the sensor plane. Finally, using CMS Phase-2 prototype pixel sensors before and after hadron irradiation, the accuracy of the beam tracks reconstructed by the EUDET beam telescopes of the DESYII test beam facility and extrapolated to the pixel sensor, is determined.
