Speaker
Summary
The Compressed Baryonic Matter experiment (CBM) at FAIR is designed to explore the QCD phase diagram in the region of high net-baryon densities. As the central detector component, the Silicon Tracking System (STS) is based on double-sided micro-strip sensors. To achieve realistic modelling, the response of the silicon strip sensors should be precisely included in the digitizer which simulates a complete chain of physical processes caused by charged particles traversing the detector, from charge creation in silicon to a digital output signal.
The current implementation of the STS digitizer comprises non-uniform energy loss distributions (according to the Urban theory), thermal diffusion, Lorentz shift in magnetic field, charge redistribution over the read-out channels due to interstrip capacitances as well as the read-out chip modelling: threshold, noise, etc.
Using the digitizer, one can test influence of each physical processes on cluster and hit parameters separately. We have developed a new cluster position finding algorithm and a hit error estimation method for it. The errors were verified by the width of pull distributions (expected to be about unity) and their shape.
