In this work the interaction of helium with intensive XUV-pulses is investigated numerically to interpret the experiments (june 2016) performed at FLASH (Free-Electron-Laser in Hamburg). For this purpose the helium atom can be regarded as a few-level-model, furthermore the electron-correlation as well as the coupling with the continuum are considered. The time-dependent Schrödinger equation of the system is solved with discrete time steps. The result is an intensity dependent variation of the observed 2s2p resonance's line shape. This variation is explained by an energy-change induced phase-shift. With this, results and explanations of similar experiments using intense IR-pulses and weak high harmonics can be conrmed. First steps of the inuence on this line shape variation due to noisy XUV-pulses produced at FLASH are investigated as well
