STUDY OF THE BEAM INDUCED RADIATION IN THE CMS DETECTOR AT THE LARGE HADRON COLLIDER

The intense radiation environment at the Large Hadron Collider (CERN) at the design energy of $\sqrt s $=14 TeV and luminosity of 10$^{34}$ cm$^{-2}$ sec$^{-1}$ poses unprecedented challenges for safe operation and performance quality of the silicon tracker detectors in the CMS and ATLAS experiments. The silicon trackers are crucial for the physics at the LHC experiments, and the inner layers, being situated only a few centimeters from the interaction point, are most vulnerable to beam-induced radiation. We have recently carried out extensive monte carlo simulation studies using MARS program to estimate particle fluxes and radiation dose in the CMS silicon pixel and strip trackers from proton-proton collisions at $\sqrt s $=14 TeV and from machine induced background such as beam-gas interactions and beam-halo. We will present results on radiation dose, particle fluxes and spectra from these studies and discuss implications for radiation damage and performance of the CMS silicon tracker detectors.