Atlas Detector ATLAS Components Discovers head-on collision

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Atlas Detector
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ATLAS Components

Discovers head-on collisions of protons of
extraordinarily high energy
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Inner Detector

• Measures the momentum of each charged particle

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Calorimeter

• Measures the energies carried by particles

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Muon Spectrometer

• Identifies and measures muons

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Magnet System

• Bends charged particles for measuring momentum

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Semiconductor Tracker (SCT)

• Measures
• Momentum
• Impact parameters
• Vertex position

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Pixel Detector

• Determines
• Impact parameter resolution
• Ability of the Inner Detector to find short-
  lived particles such as B hadrons

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Transition Radiation Tracker (TRT)

• Assists in electron identification
• Uses a system which includes Xenon gas and
  straws
• Each straw is 4 mm in diameter and equipped with
  a 30 µm diameter gold-plated W-Re wire.
• The maximum straw length is 144 cm in the barrel,
  which contains about 50 000 straws.
• Endcaps contain about 320,000 radial straws.

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ATLAS

• ATLAS
• Is 45 meters long.
• Is more than 25 meters high.
• Weighs about 7,000 tons.
• Is half as big as the Notre Dame Cathedral in
  Paris.
• Weighs the same as the Eiffel Tower.

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ATLAS vs. LHC

• LHC
• Lies in a tunnel 27 kilometers (17 miles) in
  circumference.
• Is 175 meters (574 ft.) beneath the Franco-Swiss
  border.
• Workers include over 10,000 scientists and
  engineers from over 100 countries.

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Citations

• http//atlas.ch/detector.html
• http//atlas.ch/inner_detector3.html
• http//visits.web.cern.ch/visits/guides/tools/manu
  al/english/atlas.html
• http//www.boston.com/bigpicture/2008/08/the_large
  _hadron_collider.html