Optical Bragg accelerators.

摘要: It is demonstrated that a Bragg waveguide consisting of series dielectric layers may form an excellent optical acceleration structure. Confinement the accelerating fields achieved, for both planar and cylindrical configurations by adjusting first layer width. A typical structure made silica zirconia support gradients order $1\phantom{\rule{0.3em}{0ex}}\text{GV}∕\mathrm{m}$ with interaction impedance few hundreds ohms energy velocity less than $0.5\mathrm{c}$. An about $1000\phantom{\rule{0.3em}{0ex}}\ensuremath{\Omega}$ be obtained replacing Zirconia (fictitious) material $\ensuremath{\epsilon}=25$. Special attention paid to wake field developing in such In case relatively small number layers, it shown total electromagnetic power emitted proportional square electrons macrobunch inversely microbunches; this also internal radius structure, width vacuum core Quantitative results are given higher showing comparison bounded metallic walls, significantly smaller due propagation bands allowing escape.