The Module Nuclear Absorber of the ATLAS Hadron Calorimeter (An Experiment of Controlled Assembly on the Surface and Underground)

The Hadron Calorimeter of the ATLAS spectrometric complex is a principal part of the whole setup. This paper describes the developed concept and methods for the controlled construction of a steel nuclear calorimeter absorber which provides calorimeter assembly on the surface and in the underground experimental hall meeting the required design tolerances.