Precision Propulsion Concepts for Microsatellites

We will develop a detailed conceptual design study of precision propulsion techniques, and quantify the expected performance characteristics with analysis, modeling and hardware. We will determine spacecraft performance criteria for spacecraft operating in clusters, propulsion system requirements, and analyze spacecraft vector velocity and placement precison vs. thruster parameters. A key feature of our analysis will be assessing the suitability of PA's micro-laser-plasma thrusters (uLPT's) to precision propulsion of spacecraft. These include the model "A" uLPT, a millisecond-pulse diode laser driven device, and the newer model "B", which is a nanosecond-pulse fiber laser driven thruster. The model "B" is an exciting development which we believe will prove a perfect match to the precision propulsion problem. Both models feature minimum impulse bits of order 400 piconewton-seconds. Model "A" has demonstrated operation over a continuous range from 400 piconewtons (1 impulse bit/s) to 960 micronewtons maximum thrust. The model "B" will require thrust and single pulse operation testing in the laboratory. As part of this effort, we will adapt existing theory to include the effects of multiple laser shots on one irradiation site.