Ion thruster

NASA's 2.3 kW NSTAR ion thruster for the Deep Space 1 spacecraft during a hot fire test at the Jet Propulsion Laboratory
NEXIS ion engine test (2005)

An ion thruster or ion drive is a form of electric propulsion used for spacecraft propulsion. It creates thrust by accelerating positive ions with electricity. The term refers strictly to gridded electrostatic ion thrusters, and is often incorrectly loosely applied to all electric propulsion systems including electromagnetic plasma thrusters.[citation needed]

An ion thruster ionizes a neutral gas by extracting some electrons out of atoms, creating a cloud of positive ions. These thrusters rely mainly on electrostatics as ions are accelerated by the Coulomb force along an electric field. Temporarily stored electrons are finally reinjected by a neutralizer in the cloud of ions after it has passed through the electrostatic grid, so the gas becomes neutral again and can freely disperse in space without any further electrical interaction with the thruster. Electromagnetic thrusters on the contrary use the Lorentz force to accelerate all species (free electrons as well as positive and negative ions) in the same direction whatever their electric charge, and are specifically referred as plasma propulsion engines, where the electric field is not in the direction of the acceleration.[1][2]

Ion thrusters in operational use have an input power need of 1–7 kW, exhaust velocity 20–50 km/s, thrust 25–250 millinewtons and efficiency 65–80%[3][4] though experimental versions have achieved 100kW, 5N.[5]

The Deep Space 1 spacecraft, powered by an ion thruster, changed velocity by 4.3 km/s while consuming less than 74 kilograms of xenon. The Dawn spacecraft broke the record, with a velocity change of 10 km/s.[3][4]

Applications include control of the orientation and position of orbiting satellites (some satellites have dozens of low-power ion thrusters) and use as a main propulsion engine for low-mass robotic space vehicles (such as Deep Space 1 and Dawn).[3][4]

Ion thrust engines are practical only in the vacuum of space and cannot take vehicles through the atmosphere because ion engines do not work in the presence of ions outside the engine. Additionally, the engine's minuscule thrust cannot overcome any significant air resistance. Spacecraft rely on conventional chemical rockets to initially reach orbit.

Origins

SERT-1 spacecraft

The first person to mention the idea publicly was Konstantin Tsiolkovsky in 1911.[6] However, the first document to consider electric propulsion is Robert H. Goddard's handwritten notebook in an entry dated September 6, 1906.[7] The first experiments with ion thrusters were carried out by Goddard at Clark University from 1916–1917.[8] The technique was recommended for near-vacuum conditions at high altitude, but thrust was demonstrated with ionized air streams at atmospheric pressure. The idea appeared again in Hermann Oberth's "Wege zur Raumschiffahrt” (Ways to Spaceflight), published in 1923, where he explained his thoughts on the mass savings of electric propulsion, predicted its use in spacecraft propulsion and attitude control, and advocated electrostatic acceleration of charged gasses.[6]

A working ion thruster was built by Harold R. Kaufman in 1959 at the NASA Glenn Research Center facilities. It was similar to a gridded electrostatic ion thruster and used mercury for propellant. Suborbital tests were conducted during the 1960s and in 1964, the engine was sent into a suborbital flight aboard the Space Electric Rocket Test 1 (SERT 1).[9][10] It successfully operated for the planned 31 minutes before falling to Earth.[11] This test was followed by an orbital test, SERT-2, in 1970.[12][13]

An alternate form of electric propulsion, the Hall effect thruster, was studied independently in the U.S. and the Soviet Union in the 1950s and 1960s. Hall effect thrusters operated on Soviet satellites from 1972 until the late 1990s, mainly used for satellite stabilization in North-South and in East-West directions. Some 100–200 engines completed missions on Soviet and Russian satellites.[14] Soviet thruster design was introduced to the West in 1992 after a team of electric propulsion specialists, under the support of the Ballistic Missile Defense Organization, visited Soviet laboratories.

Other Languages
Afrikaans: Ioonenjin
العربية: محرك أيوني
беларуская: Іонны рухавік
català: Motor iònic
čeština: Iontový motor
dansk: Ion-motor
Deutsch: Ionenantrieb
eesti: Ioonmootor
Esperanto: Jonpelilo
euskara: Motor ioniko
français: Moteur ionique
Gaeilge: Ianinneall
hrvatski: Ionski pogon
ქართული: იონის ძრავი
latviešu: Jonu dzinējs
magyar: Ionhajtómű
Nederlands: Ionenmotor
norsk: Ionemotor
norsk nynorsk: Ionemotor
português: Propulsor de íons
română: Motor ionic
Simple English: Ion thruster
slovenščina: Ionski pogon
srpskohrvatski / српскохрватски: Ionski pogon
svenska: Jonmotor
Türkçe: İyon motoru
українська: Іонний двигун
Tiếng Việt: Động cơ ion