STANFORD LINEAR ACCELERATOR CENTER / SCIENCE PHOTO LIBRARY STANFORD LINEAR ACCELERATOR CENTER / SCIENCE PHOTO LIBRARY
View of the tunnel of the PEP accelerator at the Stanford Linear Accelerator Center (SLAC), Calif- ornia. PEP stands for Positron Electron Project, & it accelerates positrons & electrons up to energies of 15 billion electron volts (15 GeV). The particles are accelerated in opposite direct- ions in the same beam tube & collide at six interaction regions. PEP was completed in 1979 & has a circumference of 1. The photo shows two of PEP's long, red, dipole, bending magnets & one of its square, blue, quadrupole focusing magnets.
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