Stimulated dielectric wakefield accelerator

A dielectric-lined waveguide can be built that supports multi-mode, nearly non-dispersive propagation; wherein a superposition of TM_0n wakefields is shown to result in highly peaked axial electric fields localized on each driving bunch in a periodic sequence. This allows stimulated emission of wakefield energy to occur at a rate which is much larger than the coherent spontaneous emission from a single driving bunch of equal charge. This mechanism can make possible design of a stimulated wakefield accelerator that appears to have the potential of providing an acceleration gradient for electrons or positrons in the range of 50-100 MeV/m, taking a driving bunch charge of a few nC. We present calculations for such wakefields, and give an example with acceleration of a 30 MeV test bunch to 155 MeV in a 2-D dielectric waveguide 200 cm in length, using ten identical 2.0 nC/mm drive bunches