Speaker
Dr
Thierry Paulmier
(ONERA)
Description
Charging effects are usually dominated by two main parameters: electron emission [yield and spectrum] (under electron or photon irradiation) and bulk conductivity (intrinsic and radiation induced [instantaneous or delayed]). These data are needed by the community to perform charging predictions for assigned missions. This study was divided into two overall main tasks: the first task was dedicated to the measurement of electron emission yield and spectrum on common space materials in a representative incident energy range. Five different materials have therefore been tested in this task: Aluminized Kapton-50µm, CRFP, CMX-100 UVS, CMX-150 AR, CMX covered with ITO. The second main task of this study was dedicated to the characterisation of bulk and radiation induced conductivity of polymers and non-polymers (ceramics and glasses) and their evolution in regard of sample reproducibility, composition and structure variation and environmental conditions (radiation dose rate, temperature). Four different polymers have been tested in this study: FEP, PEEK, ETFE and silicon adhesives. Three non-polymer materials have been tested as well: CMG glass, Borosilicate glass from Schott, Aluminium oxide Al2O3. The major objective in this last task was, for polymers, to understand physical variations of conductivity of similar materials and, for non-polymers, to get better knowledge on the main physical contributions steering bulk and radiation induced conductivity at low temperature.
