DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Close-up of the central part of the MAC (Magnetic calorimeter) detector on the PEP electron/positron accelerator at Stanford Linear Accelerator Center (SLAC), California. The photograph shows the hole through which the particle beam pipe goes, and some of the mass of wiring which carries the signals from the detector to the control electronics.
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