Measurement of the Z boson cross-section in - Harvard University ...

Chapter 2: The Accelerator and the Experiment 38
η = −ln[tan θ].
The ATLAS detector was designed to have uniform segmentation in
2
η and φ to exploit these properties of hadronic collisions.
Figure 2.2: A cutaway view of the ATLAS detector. The dimensions and the different
subsystems are indicated.
Reference [98] presents an extensive overview of all aspects of the detector. The
following sections summarize the salient features of each subsystem and of the trigger
and data acquisition systems.
2.2.1 The magnet system
The overall design of ATLAS was largely determined by the choice of the magnet
system, which consists of a superconducting solenoid surrounding the inner detector
and a superconducting air-core toroid for the muon system that has a barrel and