// PROPULSION SYSTEMS AND ENGINE TECHNOLOGY TERM
Iodine Propellant
Iodine is a propellant used in electric thrusters for spacecraft, primarily satellites. It is stored as a dense solid and turns directly into a gas for use, which saves valuable space compared to traditional pressurized gas propellants like xenon.
TECHNICAL DEFINITION
Iodine (I2) is a high-performance alternative propellant for electric propulsion systems, such as Hall-effect thrusters and ion engines, notable for its high storage density as a solid. This halogen propellant is sublimated into a gaseous state for ionization, offering comparable performance to xenon due to its high atomic mass and low ionization energy, making it ideal for volume-constrained small satellite and CubeSat missions.
BACKGROUND
An ion thruster, ion drive, or ion engine is a form of electric propulsion used for spacecraft propulsion. An ion thruster creates a cloud of positive ions from a neutral gas by ionizing it to extract some electrons from its atoms. The ions are then accelerated using electricity to create thrust. Ion thrusters are categorized as either electrostatic or electromagnetic.
READ MORE ON WIKIPEDIASYNONYMS & ALIASES
- I2 propellant
- solid iodine fuel
- halogen propellant
- sublimating propellant
- xenon alternative
- iodine-fed thruster
USAGE NOTE
Engineers often select iodine for small satellite missions because its solid storage eliminates the need for heavy, high-pressure gas tanks.
DEVELOPERS
Organizations developing technology related to Iodine Propellant.
A French company that pioneered the use of iodine propellant for electric propulsion systems in space. They have successfully demonstrated their iodine-fueled NPT30-I2 thruster on multiple in-orbit missions, offering a high-density, unpressurized alternative to xenon.
A French company developing electric propulsion systems for small satellites. Their ExoMG™ line of Hall-effect thrusters is designed to operate with iodine propellant, providing a scalable and high-performance solution for satellite mobility.
An American company specializing in advanced electric propulsion. Busek has developed and tested iodine-fueled Hall-effect thrusters, including the BHT-350, often in collaboration with NASA, to advance the technology for future space missions.
A major research center for the U.S. space agency that actively investigates and develops advanced propulsion technologies. NASA Glenn has been instrumental in testing and characterizing the performance of iodine Hall thrusters, viewing it as a key enabler for cost-effective small spacecraft missions.
A Spanish startup developing modular and customizable electric propulsion systems for small satellites. Their ATHENA (Adaptable Thruster based on HElical anNtennA) thruster is designed to be propellant-agnostic, with iodine being one of the key propellants utilized.
A subsidiary of Northrop Grumman, Vacco develops and manufactures specialized components for space systems, including propulsion. They have developed iodine-compatible propellant feed systems and components necessary for the reliable operation of iodine thrusters.
A U.S. federally funded research and development center (FFRDC) that provides technical guidance on space missions. The corporation has conducted extensive research into the benefits, challenges, and system-level impacts of using iodine as a spacecraft propellant.