Atlas Detector

ATLAS Components

Discovers head-on collisions of protons of extraordinarily high energy

Inner Detector

Measures the momentum of each charged particle

Calorimeter

Measures the energies carried by particles

Muon Spectrometer

Identifies and measures muons

Magnet System

Bends charged particles for measuring momentum

Semiconductor Tracker (SCT)

Measures: • Momentum • Impact parameters• Vertex position

Pixel Detector

Determines:• Impact parameter

resolution• Ability of the Inner

Detector to find short- lived particles such as B hadrons

Transition Radiation Tracker (TRT)

Assists in electron identificationUses 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.

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.

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.

Citations

• http://atlas.ch/detector.html• http://atlas.ch/inner_detector3.html • http://visits.web.cern.ch/visits/guides/tools/

manual/english/atlas.html• http://www.boston.com/bigpicture/2008/08/

the_large_hadron_collider.html