The recent chip accelerator is a linear accelerator. It looks like they used a linear channel for the chip. I believe this view of accelerators is incorrect and accelerators need to use a looping radial channel which would allow for 1000 kilometer or more accelerators. a centimeter array could contain a 50 meter accelerator.
A linear accelerator is inefficient relative to a looped structure.
http://www.natureworldnews.com/articles/4234/20130930/accelerator-chip-reduce-size-cost-particle-accelerators-videos.htm