Cathode for Electric Space Propulsion Utilizing Iodine as Propellant, Phase I

Metadata Updated: July 17, 2020

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.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date August 1, 2018
Metadata Updated Date July 17, 2020

Metadata Source

Harvested from NASA Data.json

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Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date July 17, 2020
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_93404
Public Access Level public
Bureau Code 026:00
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Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id ad57a956-c307-4112-9bd1-dcc9da731a3a
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2017-12-01
Homepage URL
Data Last Modified 2020-01-29
Program Code 026:027
Source Datajson Identifier True
Source Hash dbd98408856c7d3c6f55a022ae06bfcb7adc2cae
Source Schema Version 1.1

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