Free Electron laser in the Magnetically Dominated Regime: Simulations with the ONEDFEL Code

J. Plasma Phys. 91, E10 (2025)https://ireap.umd.edu/10.1017/S00223778240004972025Journal ArticleComplex and Emergent Systems

Using the ONEDFEL code we perform free electron laser simulations in the astrophysically important guide-field dominated regime. For wigglers’ (Alfvén waves) wavelengths of tens of kilometres and beam Lorentz factor ∼10³, the resulting coherently emitted waves are in the centimetre range. Our simulations show a growth of the wave intensity over fourteen orders of magnitude, over the astrophysically relevant scale of approximately a few kilometres. The signal grows from noise (unseeded). The resulting spectrum shows fine spectral substructures, reminiscent of those observed in fast radio bursts.