TY - DATA T1 - Statistics of the generated pulses PY - 2013/08/13 AU - G M Nikolopoulos AU - P Lambropoulos UR - https://iop.figshare.com/articles/figure/_Statistics_of_the_generated_pulses/1012379 DO - 10.6084/m9.figshare.1012379.v1 L4 - https://ndownloader.figshare.com/files/1480201 KW - Typical distributions KW - pulse KW - tilde KW - Other parameters KW - 10 fs KW - flash KW - fel KW - interaction KW - pdf KW - Atomic Physics KW - Molecular Physics N2 - Figure 2. Statistics of the generated pulses. Typical distributions of (a) the instantaneous intensity \tilde{I}(t)=I_s(t)/\langle I_s(t)\rangle at t − t0 = τ/2 and (b) the energy per pulse \tilde{W}=W_s/\langle W_s\rangle. The dashed lines are fits according to the expected PDFs (see the text). Other parameters: τ = 10 fs, σω = 0.25 rad fs−1, 103 trajectories. Abstract Motivated by recent experiments pertaining to the interaction of weak SASE-free-electron-laser (FEL) pulses with atoms and molecules, we investigate the conditions under which such interactions can be described in the framework of a simple phase-diffusion model with decorrelated atom–field dynamics. The nature of the fluctuations that are inevitably present in SASE-FEL pulses is shown to play a pivotal role in the success of the decorrelation. Our analysis is performed in connection with specific recent experimental results from FLASH in the soft x-ray regime. ER -