Study of radiation damage in silicon detectors for high ... - F9

1. Introduction 7Figure 1.2: Schematic layoutoftheATLAS detector.segment provides better signal to noise ratio.High luminosity and high interaction energy at the LHC will result in extremelyhigh interaction rates. At maximum luminosity about 30 primary interactions will occurin every beam crossing (every 25 ns) producing several hundred secondary particles. Thiswill result in signicant radiation damage of the inner detector, especially for the layersat small radii. Results of the simulation of particle uxes and estimated consequentdamage of the silicon are presented in [6] and [7] . Radiation doses at the SCT radiiare calculated to be around 1:5 10 13 equivalent 1MeV neutrons per cm 2 per year and 4kGy/year 2 (g. 1.4, 1.5). A careful study of radiation damage of silicon detectors is thusnecessary to enable proper design and operation scenaria that will provide operation ofthe semiconductor tracker over 10 years of data-taking. A considerable eort of manygroups has been already directed to this eld.2Numbers given are the typical values. Maximal values are estimated to 2 10 13 cm 2 /year of 1 MeVneutrons equivalent and 10 kGy/year [6].