ESA Science & Technology - Publication Archive
Editor: A. Wilson The report for the 35th COSPAR Meeting covers, as in previous issues, the missions of the Scientific Programme of ESA in the areas of astronomy, Solar System exploration and fundamental physics. This year's COSPAR Meeting occurs only weeks after the Saturn-orbit insertion of the Cassini spacecraft - carrying Europe's Huygens probe to explore the atmosphere of Titan - and at the same time as the launch of the second satellite of the Double Star project.
- perform instrument conceptual design and trades
- prepare a preliminary instrument design including budgets and subsystem designs with required performance
- show science requirements compliance
- define critical design issues requiring further analysis
- assess and analyse programme, risk and costs
Electric propulsion represents one of the most promising technologies for application in future space missions; Hall Effect Thrusters (HET's) and Gridded Ion Engines (GIE) are particularly interesting for their relatively high thrust capability coupled with a specific impulse which is up to one order of magnitude higher than latest generation chemical systems. The knowledge of the plasma plume evolution in the thrusters surrounding space is of fundamental importance, at system design level, for new generation satellites, in order to integrate the propulsive subsystem with the other vehicle subsystems: as known, the use of electro-magnetic thrusters can create compatibility problems, due to the electrically charged particle flow, which can interfere with telecommunication signals and generate erosion and insulation loss for critical satellite surfaces (e.g. solar panels, optical instruments and sensors etc.) A number of Hall thrusters plume models have been developed, present simulation techniques usually implement a Particle In Cell / Monte Carlo approach to a plasma flow considered in a quasi-neutral state, with the possibility of a residual atmosphere (typical of a vacuum chamber test facility). In this paper the 3D plume simulation model developed by Alta will be described, and applied to model the SNEMA PPS® 1350 thruster used on the SMART-1 satellite.
|Solving the puzzles of Saturn and Titan
|High ambitions for an outstanding planetary mission
|A long and rich journey
|What lies beneath?
|Vehicles of discovery
G. Racca, A. Marini and SMART-1 Project team
M. Grande, J. Huovelin, J.L. Josset, H. Keller, A. Nathues, D. Koschny, M. Almeida, J. Zender and SMART-1 Science & Technology team
The status and first results of ESA's SMART-1 mission were presented at the 1st General Assembly of the European Geosciences Union on 26 April 2004. The presentation covered:
- SMART-1 Technology Mission: Solar Electric Propulsion to the Moon
- Payload Technology and Science objectives
- Lunar and planetary science with SMART-1
- Performances, Status and first results data integration
- SMART-1 Contribution to preparing Future Planetary exploration
Contact: Bernard H. Foing, Chief Scientist, ESTEC/SCI-SR, ESA Science Directorate, Bernard.Foingesa.int