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The International Linear Collider (ILC) is a project of an electron-positron(e+e-) linear collider with the centre-of-mass energy of 200-500 GeV.Monolithic Active Pixel Sensors (MAPS) are one of the proposed silicon pixeldetector concepts for the ILC vertex detector (VTX). Basic characteristics oftwo MAPS pixel matrices MIMOSA-5 (17 $\mu$m pixel pitch) and MIMOSA-18 (10$\mu$m pixel pitch) are studied and compared (pedestals, noises, calibration ofthe ADC-to-electron conversion gain, detector efficiency and charge collectionproperties). The e+e- collisions at the ILC will be accompanied by intensebeamsstrahlung background of electrons and positrons hitting inner planes ofthe vertex detector. Tracks of this origin leave elongated clusters contrary tothose of secondary hadrons. Cluster characteristics and orientation withrespect to the pixels netting are studied for perpendicular and inclinedtracks. Elongation and precision of determining the cluster orientation as afunction of the angle of incidence were measured. A simple model of signalformation (based on charge diffusion) is proposed and tested using thecollected data.

Measurements and simulations of MAPS (Monolithic Active Pixel Sensors) response to charged particles - a study towards a vertex detector at the ILC