A miniature electrostatic ion thruster is proposed for maneuvering small spacecraft. In a thruster based on this concept, one or more propellant gases would be introduced into an ionizer based on the same principles as those of the device described in the earlier article, “Miniature Bipolar Electrostatic Ion Thruster” (NPO-21057). On the front side, positive ions leaving an ionizer element would be accelerated to high momentum by an electric field between the ionizer and an accelerator grid around the periphery of the concave laminate structure. On the front side, electrons leaving an ionizer element would be ejected into free space by a smaller accelerating field. The equality of the ion and electron currents would eliminate the need for an additional electron- or ion-emitting device to keep the spacecraft charge-neutral. In a thruster design consisting of multiple membrane ionizers in a thin laminate structure with a peripheral accelerator grid, the direction of thrust could then be controlled (without need for moving parts in the thruster) by regulating the supply of gas to specific ionizer.
This work was done by Frank T. Hartley and James B. Stephens of Caltech for NASA’s Jet Propulsion Laboratory. (reference NPO-21059) is currently available for download from the TSP library. Don't have an account? The document is a Technical Support Package from NASA, specifically focused on Miniature Free-Space Electrostatic Ion Thrusters, referenced as NPO-21059 in NASA Tech Briefs. It is produced under the Commercial Technology Program of NASA, which aims to disseminate results from aerospace-related developments that may have broader technological, scientific, or commercial applications. The document outlines the significance of miniature electrostatic ion thrusters, which are advanced propulsion systems that utilize electrostatic forces to accelerate ions, providing thrust in a vacuum environment. These thrusters are particularly relevant for space applications, where efficient propulsion systems are crucial for maneuvering spacecraft and extending mission durations. In addition to detailing the technology, the document serves as a resource for those interested in the commercial and scientific implications of this technology. It encourages readers to explore further information available through the NASA Scientific and Technical Information (STI) Program Office, which offers a variety of publications related to aerospace research and technology. The document also includes contact information for the NASA STI Help Desk, providing avenues for additional assistance. This includes a physical address, telephone number, fax number, and email for inquiries, ensuring that interested parties can easily access further information or clarification regarding the technology discussed. Furthermore, the document includes a notice regarding the liability and rights associated with the information provided. It clarifies that the United States Government and its representatives do not assume liability for the use of the information contained within the document and that any mention of trade names or manufacturers is for identification purposes only, not as an endorsement. Overall, the Technical Support Package serves as a comprehensive overview of the Miniature Free-Space Electrostatic Ion Thrusters, highlighting their potential applications and providing resources for further exploration of this innovative technology. It reflects NASA's commitment to advancing aerospace technology and fostering partnerships that can leverage these advancements for broader societal benefits.
This Brief includes a Technical Support Package (TSP).
Miniature Free-Space Electrostatic Ion Thrusters
Overview
