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Dielectric Wakefield Acceleration

Future accelerators with ultra-high fields will not be based on conventional metallic resonant cavities, because the power necessary to drive such structures becomes excessive. This forces consideration of devices that operate at higher frequencies, such as terahertz linear accelerator structures.

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 SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy