Sarah Dadouch

CNES, the French Space Agency, has been studying space high power radio frequency (RF) effects -Multipactor, Corona and Passive Intermodulationfor many decades, starting from J. Sombrin Multipactor theory and models [1] to ongoing activities covering TRL 1 from 1 to 7 with our collaborators from academia, agencies, and industries. This paper intends to discuss recent advances related to Multipactor analysis, and present our way towards our main objective in this field: to improve modelling and experimental Multipactor predictions and the synergy between the two. We are studying electron emission physics to enhance our models and measurement methods on dielectric materials, their TEEY 2 , charge dynamics, treatment of secondary and backscattered electrons and the impact on Multipactor predictions. We are developing SPIS 3 to create a robust Multipactor modelling tools, dealing with dielectric materials and electron sources, while considering couplings with current reference software such as CST Studio, Spark3D and ANSYS Multipaction. We are also studying multipactor mitigation techniques based on surface treatments for both conductor and dielectric materials, and RF components design innovations to deal with current trends such as miniaturisation and high performances leading to high power density hence Multipactor risks. These studies align with the European roadmap on Multipactor theme [2] and complement ESA funded activities. We share the main goal as to give our community experimental and numerical tools to get better Multipactor predictions to, in fine, improve the reliability and performances of our high power RF systems. As a national agency we also engage on community awareness, explaining to various space communities that high power effects should be a common concern, and robust analyses should be better integrated in development plans and not wait for an anomaly and/or a major satellite loss to happen.