  We consider the use of a dielectric-loaded structure to extract rf energy
from a high current electron drive beam as a power source for a high energy
two-beam accelerator. This represents an alternative technique which we show to
have some significant advantages over the use of the currently proposed
corrugated metal structures as power extraction devices. We discuss a
particular design that will extract high power rf (0.1 -- 1 GW) from a high
current drive beam. Rf generation and transport in this class of devices have
already been demonstrated at lower frequencies. We discuss the design
parameters for 15 and 30 GHz dielectric transfer structures and some possible
experiments.
