NanoMagSsat deployable amagnetic boom

International audienceNanoMagSat is a 12 U nanosatellite project, complementing the ESA Swarm constellation of satellites, aimed at monitoring the Earth's magnetic field and ionospheric environment on low Earth orbit. Currently, this project is under a Risk Retirement Activity funded by ESA and led by OPEN COSMOS in a consortium with CEA-Leti, IPGP, PROSIX and COMET.Two of the payloads of the satellite, the Miniaturised Absolute Magnetometer (MAM) and the High Frequency Magnetometer (HFM) need to be kept away from any source of magnetic perturbance, such as the body of the satellite platform. To do that, a 3-meter deployable boom carries the MAM at its tip, and the HFM at mid-length. This boom must accomplish a set of really challenging requirements: it must be stowed, together with its payloads and harness, in a rather small 16 U platform filled with other equipment; it must be able to also deploy the harness connecting the payloads with the platform; it must be stiff enough (with a mass at is tip and another at mid-length) to allow the ADCS to operate… and it must be completely made of amagnetic, non-conductive materials.This paper presents the innovative solution developed by COMET and PROSIX, a modular deployable boom, passively motorised with amagnetic springs. An engineering model has been manufactured and successfully tested to deploy in TVAC conditions after surviving to vibrations tests, and its magnetic signature has been measured and found satisfactory