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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