The ESA space mission Euclid is designed to map the geometry of the dark Universe and will be equipped with two instruments on-board. The VIS instrument  is composed of different subsystems including the Power and Mechanism Control Unit (PMCU). The PMCU is developed and manufactured in France under responsibility of the CEA (Commissariat à l'Énergie Atomique et aux Énergies Alternatives) with the support of CNES (Centre National d’Etudes Spatiales) . It controls VIS subsystems located in the cold PayLoad Module (PLM) which are the readout shutter, the calibration unit and the Focal Plane Array (FPA) thermistors. We will describe the integration of the PMCU, the philosophy of its tests and results obtained to qualify the unit up to the Flight Model in preparation to its delivery foreseen in Autumn 2018.
The Microchannel X-Ray Telescope will be implemented on board the SVOM space mission to observe the afterglow of gamma-ray bursts and localize them with 2 arcmin precision. The optical system is based on microchannel plates assembling in Wolter-I configuration to focus the X-rays in the focal plane, like done for the MIXS telescope of the BepiColombo ESA mission. The sensor part is a 256 × 256 pixel pnCCD from the Max-Planck Institute for Extraterrestrial Physics for high resolution spectroscopy and high quantum efficiency over 0.2 – 10 keV energy range, based on the same technology and design as the eROSITA telescopes for the Russian-German SRG mission. CEA-Irfu (Saclay) is in charge of the design and the realization of the camera, including the focal plane, the calibration wheel, the front-end electronics, the structure housing for background shielding and the active cooling system. A prototype of the full detection chain and the acquisition system was set up. The paper presents the preliminary design of the electrical, mechanical and thermal architectures of the camera. It focuses on the fabrication and testing of the critical elements of the design and concludes on the on-going developments.