The ATLAS detector as installed in its experimental cavern at point 1 at CERN is described in this paper. A brief overview of the expected performance of the detector when the Large Hadron Collider begins operation is also presented.

The ATLAS Experiment at the CERN Large Hadron Collider

This paper describes the ATLAS experiment as installed in i ts experimental cavern at point 1 at CERN. It also presents a brief overview of the expec ted performance of the detector.

http://absimage.aps.org/image/SES08/MWS_SES08-2008-020010.pdf

Theory and phenomenology of two-Higgs-doublet models

The simulation software for the ATLAS Experiment at the Large Hadron Collider is being used for large-scale production of events on the LHC Computing Grid. This simulation requires many components, from the generators that simulate particle collisions, through packages simulating the response of the various detectors and triggers. All of these components come together under the ATLAS simulation infrastructure. In this paper, that infrastructure is discussed, including that supporting the detector description, interfacing the event generation, and combining the GEANT4 simulation of the response of the individual detectors. Also described are the tools allowing the software validation, performance testing, and the validation of the simulated output against known physics processes.

/pdf/the-atlas-simulation-infrastructure-gw5d3ea9bf.pdf

The ATLAS Simulation Infrastructure

The silicon pixel tracking system for the ATLAS experiment at the Large Hadron Collider is described and the performance requirements are summarized. Detailed descriptions of the pixel detector electronics and the silicon sensors are given. The design, fabrication, assembly and performance of the pixel detector modules are presented. Data obtained from test beams as well as studies using cosmic rays are also discussed.

/pdf/atlas-pixel-detector-electronics-and-sensors-18dq9iggyf.pdf

ATLAS pixel detector electronics and sensors

The innermost part of the ATLAS (A Toroidal LHC Apparatus ) experiment at the LHC (Large Hadron Collider), CERN (Conseil Eurpeenne pour la Recherche Nucleaire), is a pixel detector. To operate the readout electronics and other detector components, a complex power supply and control system is necessary. The paper describes one of the components of which the power supply system is made of: the remotely programmable voltage-regulation station. The specifications, features and characteristics of this custom made electronics sub-rack are described. Particular attention is devoted to the description of the regulator and controller boards. The implemented design solutions allow precise individual adjustment of more than 4000 floating voltages by means of a CAN (Controller Area Network) protocol. The radiation resistance of this electronics made by COTS (components out of the shell) to both gamma and protons is also presented. Statistical analysis of the electrical characteristics of more than 300 boards, equivalent of 4500 voltage channels, is presented.

F. Alberti

Papers

Voltage-regulation stations for the distributed power supply system of the ATLAS pixel detector