The Deployment Mechanism of the E.T.PACK Deorbit System: Functional and Qualification tests

The Horizon 2020 (H2020) Future Emerging Technologies (FET) OPEN Project E.T.PACK is dedicated to advancing Electrodynamic Tether (EDT) technology by developing a specialized Deorbit Device prototype for end-of-life satellite deorbiting. In collaboration with the E.T.PACK consortium, the University of Padova conducted test campaigns aimed at evaluating the Deployment Mechanism design. This paper offers an overview of these tests, with a specific emphasis on the outcomes derived from tape spool examinations and deployment tests conducted on specific tape lengths. Furthermore, the paper delineates the setup for upcoming end-to-end deployment tests, highlighting the integration of a tape collecting machine to minimize manual intervention. The three-coil spool successfully passed qualification tests under thermal-vacuum conditions, exhibiting no instances of cold-welding. Additionally, shaker tests validated the spool ability to withstand launch conditions without requiring additional containment flanges. Furthermore, the Deployment Mechanism demonstrated its proficiency in smoothly deploying tapes with varying characteristics within the desired velocity range. Moreover, the deployment process, following a specific profile, proceeded seamlessly without any complications. Consistent continuity was maintained throughout the deployment processes, with no instances of jams or disruptions observed. These testing outcomes represent a fundamental step in the preparation and testing of the Engineering Qualification Model of the Deployment Mechanism, instilling confidence that subsequent end-to-end deployment tests will progress smoothly. To this end, a specific upside-down configuration will be implemented, and a recollecting machine was designed and manufactured to facilitate tape gathering, ensuring a streamlined and efficient testing process. A description of the end-to-end deployment test setup, including the recollecting machine, is also provided in this paper.