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Concept for Tether Current Collection Using Grid -Sphere Electrodes

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NAS8-03014
Agency Tracking Number: 022754
Amount: $69,977.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Solicitation Year: N/A
Award Year: 2003
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
1800 Quail Street, Suite 101
Newport Beach, CA 92660
United States
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Nobi Stone
 (257) 971-7029
Business Contact
 Carter Bryant
Title: Business Official
Phone: (256) 971-7000
Research Institution

The generation of either propulsive thrust or electrical power with an electro-dynamic tether necessarily depends on driving a return current through the system?s electrically conducting space plasma environment. An electrical connection is, therefore, required between the plasma and each end of the tether. The voltage required to drive the current (derived from either an external power source or the orbital motion of the conducting tether through the geomagnetic field) produces a positive bias between one end of the tether and the plasma. Electrons can be effectively collected at this positive pole with a simple, passive electrode. The proposed Grid-Sphere electrode concept (shown in Exhibit 1) is particularly interesting because of its unique capability to decouple current collection from tether length and to achieve a high area-to-mass ratio, a low drag coefficient, and operational simplicity. Phase I will include the identification of photolizable thin film materials and grid encapsulation techniques, a preliminary investigation of grid electrode current collection physics, and a top-level applications study. Phase II will include the development of a high fidelity current collection model and the design, fabrication, and functional testing of a prototype Grid-Sphere system.

* Information listed above is at the time of submission. *

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