JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
A physicist works in the CMS general-purpose particle detector building at CERN during the 2013 shut-down of the Large Hadron Collider. The CMS (Compact Muon Solenoid) detector is constructed in separate vertical layers which can be moved apart so as to allow work on different parts when experiments are not running. The image shows the space between two layers with the iron yoke, painted red, and the steel muon chambers which surround the 7m diameter superconducting wire solenoid and its associated tracker and calorimeter detectors.
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