  We study the influence of finite emittance electron bunches in the bubble
regime of laser-driven wakefield acceleration onto the microscopic structure of
the bunch itself. Using resilient backpropagation (Rprop) to find the
equilibrium structure, we observe that for realistic and already observed
emittances the previously found crystalline structures remain intact and are
only widened marginally. Higher emittances lead to larger electron
displacements within the crystal and finally its breaking.

Plasma Physics