Fig. 3: Electron energy spectra at varying propagation directions.
From: Unforeseen advantage of looser focusing in vacuum laser acceleration
Angle-resolved electron spectra with the f#1 (a, b) and f#3 (c, d) configuration. Panels a, c are experimental averaged electron energy spectra resolved along the azimuth angle. The shaded area in a, c represents the standard deviation over several (3–5) shots. Panels b, d are simulated angle-resolved electron spectra at certain azimuth angles. The range of angles around [0–40°] over which the electron spectra is integrated in panels b, d is chosen in accordance with the approximate width of the detector window (spectrometer acceptance angle), i.e., a polar and azimuth angle of about ± 6. 1° for f#1 and ± 4. 5° for f#3. The lighter lines in background of b, d are raw simulation data and the thick lines are their smoothed version.
