The Thorad-Agena launch vehicle with the SERT-2 (Space Electric Rocket Test-2) spacecraft on launch pad at the Western Test Range in California. The SERT-2 was launched on February 4, 1970 and tested the capability of an electric ion thruster system.

New staff member Paul Margosian inspects a cluster of ion engines in the Electric Propulsion Laboratory’s 25-foot diameter vacuum tank at the National Aeronautics and Space Administration (NASA) Lewis Research Center. Lewis researchers had been studying different methods of electric rocket propulsion since the mid-1950s. Harold Kaufman created the first successful engine, the electron bombardment ion engine, in the early 1960s. These engines used electric power to create and accelerate small particles of propellant material to high exhaust velocities. Electric engines have a very small thrust, and but can operate for long periods of time. The ion engines are often clustered together to provide higher levels of thrust. The Electric Propulsion Laboratory contained two large vacuum tanks capable of simulating the space environment. The tanks were designed especially for testing ion and plasma thrusters and spacecraft. The larger 25-foot diameter tank was intended for testing electric thrusters with condensable propellants. The tank’s test compartment, seen here, was 10 feet in diameter. Margosian joined Lewis in late 1962 during a major NASA hiring phase. The Agency reorganized in 1961 and began expanding its ranks through a massive recruiting effort. Lewis personnel increased from approximately 2,700 in 1961 to over 4,800 in 1966. Margosian, who worked with Bill Kerslake in the Electromagnetic Propulsion Division’s Propulsion Systems Section, wrote eight technical reports on mercury and electron bombardment thrusters, thermoelectrostatic generators, and a high voltage insulator.

During this Engineering Qualification Module test, the gimbal platforms for the Busek-built BHT-6000 Hall effect thrusters are exercised through their full range of motion to verify articulation performance and confirm the system can properly steer thrust once integrated with Gateway’s Power and Propulsion Element (PPE). On PPE, four BHT-6000 Hall effect thrusters and three Advanced Electric Propulsion System (AEPS) thrusters will use solar power generated by Gateway’s Roll-Out Solar Arrays (ROSAs) to ionize xenon gas. The resulting xenon ions are then accelerated to extremely high speeds and expelled from the thrusters, creating a steady and highly efficient stream of thrust. This propulsion system will enable the Gateway lunar space station to maneuver and maintain its orbit around the Moon.

During this Engineering Qualification Module test, the gimbal platforms for the Busek-built BHT-6000 Hall effect thrusters are exercised through their full range of motion to verify articulation performance and confirm the system can properly steer thrust once integrated with Gateway’s Power and Propulsion Element (PPE). On PPE, four BHT-6000 Hall effect thrusters and three Advanced Electric Propulsion System (AEPS) thrusters will use solar power generated by Gateway’s Roll-Out Solar Arrays (ROSAs) to ionize xenon gas. The resulting xenon ions are then accelerated to extremely high speeds and expelled from the thrusters, creating a steady and highly efficient stream of thrust. This propulsion system will enable the Gateway lunar space station to maneuver and maintain its orbit around the Moon.

During this Engineering Qualification Module test, the gimbal platforms for the Busek-built BHT-6000 Hall effect thrusters are exercised through their full range of motion to verify articulation performance and confirm the system can properly steer thrust once integrated with Gateway’s Power and Propulsion Element (PPE). On PPE, four BHT-6000 Hall effect thrusters and three Advanced Electric Propulsion System (AEPS) thrusters will use solar power generated by Gateway’s Roll-Out Solar Arrays (ROSAs) to ionize xenon gas. The resulting xenon ions are then accelerated to extremely high speeds and expelled from the thrusters, creating a steady and highly efficient stream of thrust. This propulsion system will enable the Gateway lunar space station to maneuver and maintain its orbit around the Moon.

Engineer Paul Reader and his colleagues take environmental measurements during testing of a 20-inch diameter ion engine in a vacuum tank at the Electric Propulsion Laboratory (EPL). Researchers at the Lewis Research Center were investigating the use of a permanent-magnet circuit to create the magnetic field required power electron bombardment ion engines. Typical ion engines use a solenoid coil to create this magnetic field. It was thought that the substitution of a permanent magnet would create a comparable magnetic field with a lower weight. Testing of the magnet system in the EPL vacuum tanks revealed no significant operational problems. Reader found the weight of the two systems was similar, but that the thruster’s efficiency increased with the magnet. The EPL contained a series of large vacuum tanks that could be used to simulate conditions in space. Large vacuum pumps reduced the internal air pressure, and a refrigeration system created the cryogenic temperatures found in space.

Psyche engineers adapted to COVID-19 social distancing and masking requirements while testing the Hall thrusters that will propel NASA's Psyche spacecraft on its journey to the main asteroid belt between Mars and Jupiter. Set to launch in August 2022, the spacecraft will utilize this super-efficient electric propulsion system to travel to the asteroid Psyche. On May 20, 2020, at NASA's Jet Propulsion Laboratory, Flight System Engineer Steve Snyder (foreground) of JPL and a crew of engineers from Maxar Technologies worked together in the control room next to the vacuum chamber where the thruster was fired up. Snyder and his Maxar colleagues (from left: Faraz Aghazadeh, Taylor Kerl and Giovanni Lenguito) put the thruster and its power supply through a series of stress tests to ensure they can operate together in the extreme conditions of deep space. In the background, a monitor projects the image of the thruster firing. The thruster works by turning xenon gas, a neutral gas used in car headlights and plasma TVs, into xenon ions. As the xenon ions are accelerated out of the thruster, they create the thrust that will propel the spacecraft. The xenon plasma emits a blue glow, seen here on the screen, as it operates. Hall thrusters will be used for the first time beyond lunar orbit, demonstrating that they could play a role in supporting future missions to deep space. Maxar and JPL adapted the Hall thruster system for use with the main body of the spacecraft that Maxar is building at its facility in Palo Alto, California. https://photojournal.jpl.nasa.gov/catalog/PIA23878

Technicians prepare the Space Electric Research Test (SERT-I) payload for a test in Tank Number 5 of the Electric Propulsion Laboratory at the National Aeronautics and Space Administration (NASA) Lewis Research Center. Lewis researchers had been studying different methods of electric rocket propulsion since the mid-1950s. Harold Kaufman created the first successful engine, the electron bombardment ion engine, in the early 1960s. These electric engines created and accelerated small particles of propellant material to high exhaust velocities. Electric engines have a very small amount of thrust, but once lofted into orbit by workhorse chemical rockets, they are capable of small, continuous thrust for periods up to several years. The electron bombardment thruster operated at a 90-percent efficiency during testing in the Electric Propulsion Laboratory. The package was rapidly rotated in a vacuum to simulate its behavior in space. The SERT-I mission, launched from Wallops Island, Virginia, was the first flight test of Kaufman’s ion engine. SERT-I had one cesium engine and one mercury engine. The suborbital flight was only 50 minutes in duration but proved that the ion engine could operate in space. The Electric Propulsion Laboratory included two large space simulation chambers, one of which is seen here. Each uses twenty 2.6-foot diameter diffusion pumps, blowers, and roughing pumps to remove the air inside the tank to create the thin atmosphere. A helium refrigeration system simulates the cold temperatures of space.

William Kerslake, a combustion researcher at the National Advisory Committee for Aeronautics (NACA) Lewis Flight Propulsion Laboratory, examines the setup of a transparent rocket in a Rocket Laboratory test cell. Kerslake joined NACA Lewis the previous summer after graduating from the Case Institute of Technology with a chemistry degree. His earliest professional research concentrated on combustion instability in small rocket engines. While at Case the quiet, 250-pound Kerslake also demonstrated his athletic prowess on the wrestling team. He continued wrestling for roughly a decade afterwards while conducting his research with the NACA. Kerslake participated in Olympic competitions in Helsinki (1952), Melbourne (1956), and Rome (1960). He won 30 national championships in three different weight classes and captured the gold at the 1955 Pan American Games in Mexico City. Kerslake accomplished all this while maintaining his research career, raising a family, and paying his own expenses. As his wrestling career was winding down in the early 1960s, Kerslake’s professional career changed, as well. He was transferred to Harold Kaufman’s Electrostatic Propulsion Systems Section in the new Electromagnetic Propulsion Division. Kaufman was developing the first successful ion engine at the time, and Kerslake spent the remainder of his career working in the electric propulsion field. He was heavily involved in the two Space Electric Rocket Test (SERT) missions which demonstrated that the ion thrusters could successfully operate in space. Kerslake retired in 1985 with over 30 years of service.