ATLAS IBL Pixel Upgrade

TL;DR

The ATLAS IBL Pixel Upgrade introduces a new innermost pixel layer with advanced sensor technologies to enhance detector performance amid increased radiation and occupancy at the super-LHC.

Contribution

This paper presents the design and technological developments of the Insertable B-Layer (IBL), including sensor technology investigations for improved radiation hardness and reduced material budget.

Findings

Development of new pixel sensor technologies (planar-Si, 3D-Si, diamond)

Implementation of a new pixel layer at 3.3 cm radius

Enhanced detector performance for super-LHC conditions

Abstract

The upgrade for ATLAS detector will undergo different phase towards super-LHC. The first upgrade for the Pixel detector will consist of the construction of a new pixel layer which will be installed during the first shutdown of the LHC machine (LHC phase-I upgrade). The new detector, called Insertable B-Layer (IBL), will be inserted 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 increase of radiation or pixel occupancy and also to improve the physics performance which will be achieved by reducing the pixel size and of the material budget. Three different promising sensor technologies (planar-Si, 3D-Si and diamond) are currently under investigation for the pixel detector. An overview of the project with particular emphasis on pixel module is presented in this paper.