Computer Science – Performance
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21548213z&link_type=abstract
American Astronomical Society, AAS Meeting #215, #482.13; Bulletin of the American Astronomical Society, Vol. 42, p.575
Computer Science
Performance
Scientific paper
The Jet Propulsion Laboratory (JPL) has delivered two flight-qualified Colloid Micro-Newton Thruster (CMNT) systems to the European Space Agency (ESA) for a flight demonstration on LISA Pathfinder. The CMNTs will provide precise spacecraft control for the drag-free technology demonstration mission, Space Technology 7 (ST7). The ST7 mission is sponsored by the NASA New Millennium Program and will demonstrate precision formation flying technologies for future missions such as LISA. The ST7 disturbance reduction system (DRS) will be part of the LISA Pathfinder mission using the European gravitational reference sensor (GRS), part of the LISA Technology Package (LTP). To achieve the nanometer-level precision control requirements, each of eight thruster systems is required to provide thrust between 5 and 30 μN with resolution ≤0.1 μN and thrust noise ≤0.1 μN/√Hz. Developed by Busek Company Inc., with support from JPL in design and testing, the CMNT has been developed over the last six years into a flight-ready and flight-qualified microthruster system, the first of its kind. Flight-unit qualification tests have included vibration and thermal vacuum environmental testing, as well as performance verification and acceptance tests. All tests have been completed successfully prior to delivery to JPL. Delivery of the first flight unit occurred in February of 2008 with the second unit following in May of 2008. Since arrival at JPL, the units have successfully passed through mass distribution, magnetic, and EMI/EMC measurements and tests as part of the integration and test activities including the integrated avionics unit (IAU). Flight software sequences have been tested and validated with the full flight DRS instrument successfully. Delivery of the DRS to ESA for integration into the LISA Pathfinder spacecraft was completed in September of 2009 with a planned launch and flight demonstration in 2011.
Connolly W.
Demmons N.
Ehrbar E.
Franklin G.
Hruby Vlad
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