Ionized Cluster Beams for Space Propulsion
Abstract
Ionized clusters formed from atomic or molecular gases possess higher mass than the heavy inert-gas ions presently used as propellants in electrostatic ion-propulsion systems; this study has investigated the possibility of using these heavy clusters in an electrostatic thruster to permit operation in the intermediate range of specific impulse (1000 to 2000 s) in which there is a need for efficient electric propulsion. Clusters are formed when gases expand through a supersonic nozzle; when a low-mass carrier gas such as hydrogen or helium is added, a large fraction of the heavier thrust gas emerges in the form of clusters. In our experiments, over 90% of carbon dioxide (mixed with hydrogen) formed clusters with typically 250 constituent molecules. These clusters can be ionized with comparably high efficiency and then accelerated electrostatically to provide thrust. Our experiments showed that additional study is needed in several areas, the most critical of which is find means to reduce the amount of carrier gas required.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 07, 1992
- Accession Number
- ADA251807
Entities
People
- W. Knauer
- W. S. Williamson
Organizations
- HRL Laboratories