Figure 12
y-polarization: bunching coefficients (a) and FEL harmonic power (b) for the phase-shifted FEL simulated for the LCLS `low energy' beam E = 4.3 GeV and undulator (21) for h = 3, l = 1, d1 = 1, d2 = 0.4. Harmonics: n = 1, red lines; n = 3, green lines; n = 5, blue lines. Subharmonics of the third dominant harmonic: n = 3 × 3, dashed lilac line; n = 5 × 3, dotted pink lines. The bunching for the weak fifth harmonic is omitted for clarity. |