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End cap of ALEPH particle detector, CERN

End cap of ALEPH particle detector, CERN

A105/0158

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Credit

PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY

Caption

One of the "end caps" of the ALEPH detector at CERN, the European centre for particle physics near Geneva. ALEPH is one of 4 giant particle detectors at the LEP collider. LEP collides electrons & positrons accelerated to an energy of 50 GeV in a circular tunnel 100m underground & 27km in circumference. ALEPH is a cylindrical assembly of many types of apparatus - hadron & electromagnetic calorimeters, drift chambers, & a time projection chamber - which fit together like layers of an onion around the point where the particles collide. The 2 end caps (the second is partly seen at far right) are 3 stories tall & fit on each end of ALEPH's central cylinder.

Release details

Model release not required. Property release not required.

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