On the design of experiments to study extreme field limits
  We propose experiments on the collision of high intensity electromagnetic pulses with electron bunches and on the collision of multiple electromagnetic pulses for studying extreme field limits in the nonlinear interaction of electromagnetic waves. The effects of nonlinear QED will be revealed in these laser plasma experiments. 
S. S. Bulanov, M. Chen, C. B. Schroeder, E. Esarey, W. P. Leemans, S.   V. Bulanov, T. Zh. Esirkepov, M. Kando, J. K. Koga, ...
physics.plasm-ph hep-ph