FEL Interaction: GPT is ideal for non wiggler averaged, multi-mode, multi-pass FEL
simulations. The GPT kernel solves all required equations for the radiation while tracking
the particles, thus ensuring self-consistent results. Results of GPT used as FEL code can
be found in our FZR FEL Project description.
Spectral evolution during 100 passes of a new electron bunch through the
undulator.
