A linac long enough to accelerate electrons to the energy needed by the ALS would not fit inside the building. Instead, a circular booster synchrotron is used in which the electrons receive a "boost" from an accelerating chamber (RF cavity) each time they go around. In less than one second inside the booster, the electrons make 1,300,000 revolutions (and travel 98,000 kilometers), reach 99.999994% of the speed of light, attain their target energy (usually 1.5 billion electron volts), and are ready to be transported to the storage ring.
  ALS Components
  The Advanced Light Source--A Tool for Solving the Mysteries of Materials


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