The ATLAS Liquid Argon Calorimeter: Online Energy and Time Calculation

被引：0

作者：

Laforge, Bertrand ^{[1
]}

机构：

[1] Univ Paris 06, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, F-75252 Paris 05, France

来源：

2008 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (2008 NSS/MIC), VOLS 1-9 | 2009年

关键词：

D O I：

暂无

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

The Liquid Argon calorimeter of the ATLAS experiment at the LHC is a key detector for the study of new physics and the discovery of the Higgs boson. It is designed to provide precision measurements of electrons, photons, jets and missing transverse energy. The front end electronics reads 200 000 calorimeter cell outputs at a sampling frequency of 40 MHz. The read out drivers (ROD) synchronize the output of the front end boards (FEB) with the level 1 trigger and compute physical quantities such as energy, time phase and quality of the signal. A large energy dynamic range of the readout cells (from 50 MeV up to 3 TeV), a good linearity and energy resolution are some of the main challenges of the Liquid Argon readout electronics. To obtain this performance, each ROD board hosts 8 Texas Instrument C64x Digital Signal Processor (DSP). Running at 720 MHz, each DSP processes the 128 output channels of one FEB in less than 10 micro seconds (following the maximum level I trigger rate of 75 kHz). Test were carried out with a complete read out system on the Liquid Argon detector showing that the DSP code (written in easily readable C language) can handle both calibration and physics runs at the required frequency.

引用

页码：953 / 956

页数：4

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