ATLAS Insertable B-Layer

For the sLHC phase I, the ATLAS detector will be upgraded by installation of an additional Pixel Detector layer. The new layer will be inserted between the B-layer of the existing pixel detector and a new smaller radius beam-pipe. This upgrade requires development of several new technologies to cope with increased radiation doses to which the apparatus will be exposed, signi cant rise of the particle ux density and further improvement of the detector physics performance. One of the means to achieve these goals is a signi cant reduction of the pixel size, the use of deep sub-micron technologies for the read-out chip fabrication, novel materials for the stave construction, advanced methods for detector cooling etc. In the present phase of the project, some key components are being developed in several options.