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In a dielectric wakefield accelerator, electromagnetic power is radiated by an ultra-short, intense "driving" electron bunch propagating in a hollow dielectric fiber. This power is then used to accelerate another "witness" bunch just as in the case of the plasma wakefield accelerator.
Sufficient available power for high acceleration gradients depends on having high peak currents, a small inner radius of the hollow dielectric fiber, and, therefore, a drive beam with high-charge, short duration and a very small profile to propagate through the fiber. The required beam can be provided only by FACET, making it a one-of-a-kind facility for exploring dielectric wakefield acceleration.
SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy