Industry | Defence industry |
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Products | Spacecraft propulsion |
The Ad Astra Rocket Company, a U.S. Delaware corporation, is a rocket propulsion company dedicated to the development of advanced plasma rocket propulsion technology. Located in Webster, Texas, three miles away from NASA's Johnson Space Center, and Liberia, Costa Rica. The company was incorporated on January 14, 2005. The President and CEO of Ad Astra Rocket Company is retired astronaut Franklin Chang Díaz. [1] The company has been working on Chang Díaz's concept of the Variable Specific Impulse Magnetoplasma Rocket, known by its acronym VASIMR. The VASIMR is intended to achieve several advantages over current chemical rocket designs, including lunar cargo transport, in-space refueling, and ultra-high speeds for distant space missions. [2]
The Ad Astra Rocket Company Costa Rica (AARC CR) is a wholly owned subsidiary of Ad Astra Rocket Company. AARC CR was formed in 2005. The facility is located approximately 10 km west of the city of Liberia, capital of the province of Guanacaste, on the campus of EARTH University. [3] On December 13, 2006, the Costa Rican team of AARC generated its first plasma. [4] After extensive testing of a 200 kW ground-test VASIMR unit, the company is aiming for a three-year flight test mission.
In March 2015, NASA selected Ad Astra for the NextSTEP program. [5] The partnership is currently ongoing as of July 2021, [6] with Ad Astra aiming to achieve the NASA-set goal of firing VASIMR continuously for 100 hours at 100 kW in the second half of 2021. [7]
The VASIMR is a state-of-the-art rocket design that uses plasma for rocket propulsion. Chang Díaz developed the concept of the VASIMR in 1979, shortly following his graduate research in fusion and plasma-based rocket propulsion at the Massachusetts Institute of Technology. After being selected as an astronaut in 1980, Chang Díaz served on seven different shuttle missions, a space record that he shares with astronaut Jerry L. Ross. After retiring in 2005 from NASA, Chang Díaz formed Ad Astra Rocket Company to develop and commercialize the VASIMR technology. [8]
Ad Astra completed a formal Preliminary Design Review (PDR) on the VF-200 engine with NASA in June 2013. This is the initial major design milestone on the path to flying a VF-200 on the ISS. [9] [ needs update ]
Ad Astra Rocket Company developed the VX-200, a full-scale prototype of the VASIMR engine intended for ground testing. The company successfully tested the prototype in September 2009. [10] Following the test, the company will begin preparations for the VF-200-1, the first flight unit. The VASIMR technology could be useful in the near future for interplanetary space travel. The VASIMR design would be capable of reducing the trip from Earth to Mars to less than four months, [11] whereas current chemical rockets would take around eight months for one-way transit, making the round-trip mission longer than 2 years. A nuclear-powered VASIMR engine could shorten the round-trip in-flight time into under five months, [12] while smaller scale solar powered engines could tug satellites through different orbits and deliver loads to the moon.
As of October 2010 [update] , the company is aiming to offer the technology for space tug missions to help "clean up the ever-growing problem of space trash." [13]
As of July 2012 [update] , a recent test phase of the VX-200 has demonstrated a ten percent increase in efficiency at intermediate levels of specific impulse, indicating that an operational version would both increase payload mass and decrease trip times. The "efficiency improvements were achieved through design improvements in critical engine components, 'fine-tuning' the radio-frequency power system settings, and upgrades to the software that controls the engine during startup and firing." [14]
As of June 2013 [update] , Ad Astra completed a formal Preliminary Design Review (PDR) on the VF-200 engine, as a critical milestone on the development pathway to testing the VF-200 on a multi-month test on the International Space Station.
By July 2021, Ad Astra had completed multiple long-duration engine firings on the upgraded VF-200SS engine, [15] [7] with a continuous firing of 100 hours at 100 KW planned as the last test before testing in space, which could occur as early as 2023. [16]
Spacecraft propulsion is any method used to accelerate spacecraft and artificial satellites. In-space propulsion exclusively deals with propulsion systems used in the vacuum of space and should not be confused with space launch or atmospheric entry.
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.
A magnetoplasmadynamic (MPD) thruster (MPDT) is a form of electrically powered spacecraft propulsion which uses the Lorentz force to generate thrust. It is sometimes referred to as Lorentz Force Accelerator (LFA) or MPD arcjet.
A nuclear electric rocket is a type of spacecraft propulsion system where thermal energy from a nuclear reactor is converted to electrical energy, which is used to drive an ion thruster or other electrical spacecraft propulsion technology. The nuclear electric rocket terminology is slightly inconsistent, as technically the "rocket" part of the propulsion system is non-nuclear and could also be driven by solar panels. This is in contrast with a nuclear thermal rocket, which directly uses reactor heat to add energy to a working fluid, which is then expelled out of a rocket nozzle.
A fusion rocket is a theoretical design for a rocket driven by fusion propulsion that could provide efficient and sustained acceleration in space without the need to carry a large fuel supply. The design requires fusion power technology beyond current capabilities, and much larger and more complex rockets.
The Variable Specific Impulse Magnetoplasma Rocket (VASIMR) is an electrothermal thruster under development for possible use in spacecraft propulsion. It uses radio waves to ionize and heat an inert propellant, forming a plasma, then a magnetic field to confine and accelerate the expanding plasma, generating thrust. It is a plasma propulsion engine, one of several types of spacecraft electric propulsion systems.
Specific impulse is a measure of how efficiently a reaction mass engine, such as a rocket using propellant or a jet engine using fuel, generates thrust.
Nuclear pulse propulsion or external pulsed plasma propulsion is a hypothetical method of spacecraft propulsion that uses nuclear explosions for thrust. It originated as Project Orion with support from DARPA, after a suggestion by Stanislaw Ulam in 1947. Newer designs using inertial confinement fusion have been the baseline for most later designs, including Project Daedalus and Project Longshot.
Franklin Ramón Chang-Díaz is a Costa Ricanmechanical engineer, physicist and former NASA astronaut. He is the sole founder and CEO of Ad Astra Rocket Company as well as a member of Cummins' board of directors. He became an American citizen in 1977.
The gridded ion thruster is a common design for ion thrusters, a highly efficient low-thrust spacecraft propulsion method running on electrical power by using high-voltage grid electrodes to accelerate ions with electrostatic forces.
The helicon double-layer thruster is a prototype electric spacecraft propulsion. It was created by Australian scientist Christine Charles, based on a technology invented by Professor Rod Boswell, both of the Australian National University.
A plasma propulsion engine is a type of electric propulsion that generates thrust from a quasi-neutral plasma. This is in contrast with ion thruster engines, which generate thrust through extracting an ion current from the plasma source, which is then accelerated to high velocities using grids/anodes. These exist in many forms. However, in the scientific literature, the term "plasma thruster" sometimes encompasses thrusters usually designated as "ion engines".
Spacecraft electric propulsion is a type of spacecraft propulsion technique that uses electrostatic or electromagnetic fields to accelerate mass to high speed and thus generating thrust to modify the velocity of a spacecraft in orbit. The propulsion system is controlled by power electronics.
The Integrated Truss Structure (ITS) of the International Space Station (ISS) consists of a linear arranged sequence of connected trusses on which various unpressurized components are mounted such as logistics carriers, radiators, solar arrays, and other equipment. It supplies the ISS with a bus architecture. It is approximately 110 meters long and is made from aluminium and stainless steel.
A space tug is a type of spacecraft used to transfer spaceborne cargo from one orbit to another orbit with different energy characteristics. The term can include expendable upper stages or spacecraft that are not necessarily a part of their launch vehicle. However, it can also refer to a spacecraft that transports payload already in space to another location in outer space, such as in the Space Transportation System concept. An example would be moving a spacecraft from a low Earth orbit (LEO) to a higher-energy orbit like a geostationary transfer orbit, a lunar transfer, or an escape trajectory.
The Dual-Stage 4-Grid (DS4G) is an electrostatic ion thruster design developed by the European Space Agency, in collaboration with the Australian National University. The design was derived by D. Fern from Controlled Thermonuclear Reactor experiments that use a 4-grid mechanism to accelerate ion beams.
Next Space Technologies for Exploration Partnerships (NextSTEP) is a NASA program using a public-private partnership model that seeks commercial development of deep space exploration capabilities to support more extensive human space flight missions in the Proving Ground around and beyond cislunar space—the space near Earth that extends just beyond the Moon.
Direct Fusion Drive (DFD) is a conceptual, low radioactivity, nuclear-fusion rocket engine, designed to produce both thrust and electric power for interplanetary spacecraft. The concept is based on the Princeton field-reversed configuration reactor, invented in 2002 by Samuel A. Cohen, and is being modeled and experimentally tested at Princeton Plasma Physics Laboratory, a U.S. Department of Energy facility. It is also modeled and evaluated by Princeton Satellite Systems. As of 2018, the concept entered Phase II, a simulation phase.
Advanced Electric Propulsion System (AEPS) is a solar electric propulsion system for spacecraft that is being designed, developed and tested by NASA and Aerojet Rocketdyne for large-scale science missions and cargo transportation. The first application of the AEPS is to propel the Power and Propulsion Element (PPE) of the Lunar Gateway, to be launched no earlier than 2025. The PPE module is built by Maxar space solutions in Palo Alto, California. Two identical AEPS engines would consume 25 kW being generated by the roll-out solar array (ROSA) assembly, which can produce over 60 kW of power.
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: CS1 maint: archived copy as title (link)characterizations of the VX-200, Ad Astra's 200-kw prototype, revealed a 10% improvement in efficiency at intermediate values of specific impulse below the 5,000-sec. optimal point demonstrated at the company's suburban Houston lab in 2009 and 2010. The efficiency improvements were achieved through design improvements in critical engine components, "fine-tuning" the radio-frequency power system settings and upgrades to the software that controls the engine during startup and firing.