The review presents the stages of modernization of the tracker system of the ATLAS detector at the Large Hadron Colider (LHC). The period from the moment of the detector creation to its further operation in the high luminosity mode of the HL-LHC is considered. Changes of the detector design at different stages, resolution when measuring tracks of charged particles, the quality of the recovery of vertices under conditions of high luminosity of the collider, leading to simultaneous recording of 200 events on average with the birth of two or more charged particles during collisions of proton bunches are shown. The physical goals are indicated, for the solution of which the realizable and planned changes of the ATLAS track system are critical.
07.07.Df Sensors
$^1$Faculty of Physics, M.V. Lomonosov Moscow State University.\
$^2$P.N.Lebedev Physical Institute of the Russian Academy of Sciences
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