SERVICE CONTRACT IO/23/CT/4300002816: ASSESSMENT OF THE OPTICAL AND PLASMA PERFORMANCES OF THE EC LAUNCHERS AND SUPPORT SUBTASK 2.2: REPORT ON THE GRASP SIMULATION OF THE EL WITH AND WITHOUT HOM CONTENT

This task includes the following work/analysis:new geometry of the optical design and surrounding structure of EL in GRASP and to validate the model with IO doing benchmark of beam propagation.GRASP analysis to get the spillover at each mirror for the three rows as well as some mapping of stray radiation.This analysis has been performed for: - nominal case, i.e. no HOM content - 10% power of LP11 spurious mode - 15% power of LP11 spurious mode From this analysis, it is reported: - incident power density map on each mirror (2 mirrors for each of the 3 rows) with the associated table giving the power fraction on each mirror for each beam and the spillover losses. - distribution of the first pass absorbed stray radiation on a surface located behind each mirror and 4 surfaces of "beam tunnel" of the front shield of the launcher.