Overview of the ATLAS insertable B-layer (IBL) project

The upgrades for the ATLAS Pixel Detector will be staged in preparation for high luminosity LHC. The first upgrade will be the construction of a new pixel layer which will be installed during the first shutdown of the LHC machine, foreseen in 2013–2014. The new detector, called the Insertable B-layer (IBL), will be installed between the existing Pixel Detector and a new, smaller radius beam-pipe at a radius of 3.3 cm. The IBL will require the development of several new technologies to cope with increased radiation and pixel occupancy and also to improve the physics performance through reduction of the pixel size and a more stringent material budget. Two silicon sensor technologies, planar and 3D, are currently under investigation for the IBL. An overview of the IBL project, of the module design and the qualification for these sensor technologies is presented.

► ATLAS will install a new inner pixel layer in 2013, the Insertable B-layer (IBL).
► At a radius of 3.3 cm the IBL will have to sustain a dose of 5E15 neq/cm2neq/cm2 during its expected lifetime.
► New sensor technologies have been developed for the IBL: planar and 3D sensors.
► Planar and 3D IBL sensor productions have been completed and the devices evaluated in beam tests.
► Both technologies performed within the IBL requirements in terms of efficiency after irradiation.