Fig. 7 | Scientific Reports

Fig. 7

From: Ultra-high-brightness and tuneable attosecond-long electron beams with the laser wake field acceleration

Fig. 7

Dependence of the beam duration from the delay \(\Delta t=-\bar{\xi }_e/(k_p c)\) between the ionization pulse center of mass and the node of the accelerating gradient, where the beam lengths are expressed in \({rms}\) equivalent and evaluated with the robust MAD statistics. The solid lines refer to working points having ionization pulse duration \(T_i=30 fs\) FWHM, as in this work. The blue band corresponds to the interval of durations achievable with ionization pulses having duration between 20 and 40 fs long.

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