Figure 2
Spectral line of the third (a) and of the second (b) FEL harmonics of the LCLS undulator with period λu = 3 cm, k = 3.5, N = 113, σe = 0.0003, γ = 8400, off-the-axis angle γθ = 0.1. The spectral lines are shown for the detuning parameter νn and the field Hd. |