Development and coupling test of active spacecraft potential control-Next generation (ASPOC-NG)

The active spacecraft potential control (ASPOC) system developed in the 1990s emits positive ions to neutralise the spacecraft poten-tial, such as used in several missions like Geotail, Equator-S, Cluster, Doublestar and MMS. With the experience gained, the next gen-eration of the active spacecraft potential control (ASPOC-NG) instrument has been developed over the last three years. Thereby, three emission technologies were tested including Liquid Metal Ion Source (LMIS), Liquid Metal Electron Source (LMES) and Solid Metal Electron Source (SMES). The development of the emitter module by FOTEC and the corresponding electronics control unit by IWF is presented. Optimisations were carried out with the focus on the reduction of mass and power consumption to comply with the require-ments of future scientific missions. Coupling tests of the modules and the electronics control unit were performed including range, accu-racy and lifetime tests. Both ASPOC-NG instruments for positive and negative charge compensation and their performance values show excellent results.(c) 2022 COSPAR. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).