ABSTRACT
The dynamic behaviour of the space-charge fields for these approaches is very different. This can easily be seen by comparing the aspect ratio A in the rest-frame of the bunch, defined as A=RI(yL) with R the bunch radius, L the length and y the Lorentz factor. As shown in Table I, the compression scheme has an aspect ratio of near unity, for a l mm radius, at l MeV. At that energy, the 'TU/e' bunch still has an aspect ratio far larger than one, i.e. a 'pancake' geometry.
