Figure 11
Bunching evolution in the cos–sin spiral undulator FEL with the field (18) for γ = 1570, I0 = 120 A, ∊n = 10−6 mm mrad, β = 0.37 m, k = 2.216, h = 3, d = 0.3, λu = 2.3 cm. Harmonics: n = 1 (red), n = 2 (yellow), n = 3 (green), n = 4 (green dashed), n = 5 (blue dotted). |