Cathode for Electric Space Propulsion Utilizing Iodine as Propellant

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX17CC41P
Agency Tracking Number: 174476
Amount: $124,875.00
Phase: Phase I
Program: SBIR
Awards Year: 2017
Solicitation Year: 2017
Solicitation Topic Code: S3.02
Solicitation Number: N/A
Small Business Information
21070 Southwest Tile Flat Road, Beaverton, OR, 97007-8739
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Bernard Vancil
 Principal Investigator
 (503) 628-0703
Business Contact
 Bernard Vancil
Title: Business Official
Phone: (503) 628-0703
Research Institution
We propose a hollow reservoir cathode suitable for use in ion or Hall thrusters which utilizes iodine as a propellant. Reservoir cathodes have several unique features which will allow them to resist the corrosive effects of iodine. Chief amongst these is that the barium-emission-material-containing reservoir is isolated from the iodine flow. This allows free barium to be produced in an environment free of iodine. Furthermore, barium production rates in reservoir cathodes can be adjusted to very high levels -- high enough to overcome the deleterious effects of iodine at the cathode's emitting surface. Reservoir cathodes carry a barium supply that is 100 times that of conventional cathodes. Furthermore, the reservoir cathode inserts can be made of materials other than tungsten. This is not possible with impregnated cathodes. These materials can be selected for their resistance to iodine attack. They include osmium, rhodium, and iridium. NASA is pursuing iodine EP because of iodine's advantages over xenon, especially for small satellite propulsion. Most important are its low cost and its high storage density. Also, it requires no high-pressure, large and heavy pressure vessels.

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

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