Ion engines are not new. There are many satellites that have used them to stabilize themselves in their orbit. It has also been used in small ships like that of the Psyche missionwhose objective was to explore the asteroid with the same name. However, NASA wants to go further and create an ion engine so powerful that in the future it can be used to take humans to Mars. There is still a long way to go; But, according to their latest evidence, they could be on the right track.
The most powerful ion engine. Until now, the most powerful ion engine that has been used to go to space has been that of the Psyche mission. With it, a speed of 200,000 kilometers per hour has been reached. Instead, NASA scientists have recently tested a much more powerful engine on Earth. It is a lithium-powered magnetoplasmadynamic thruster, which uses an electric current, which interacts with a magnetic field to accelerate a lithium-ion-based propellant. All this is done in a vacuum chamber 8 meters long.
After the tests, 120 kilowatts of power have been reached: 25 times more than with Psyche. It is still not enough to travel to Mars, but, after the success of the tests, these researchers hope to be able to scale the process until they achieve 4 megawatt engines. Several of those could be used to conquer the red planet.
Different ions. Broadly speaking, an ion engine consists of a vacuum chamber in which an electromagnetic field accelerates electrically charged atoms through a nozzle, generating thrust. Those charged atoms are the ionic propellant. Traditionally, xenon is used, although metallic plasmas have also begun to be explored. That’s where lithium comes into play.
Advantages. Ion-powered engines use 90% less propellant than chemical ones. That, in itself, is already a great advantage. On the other hand, although they start with a very low speed, they have the advantage that, in the absence of friction, as occurs in the vacuum of space, they keep accelerating for a long timeso they can reach very high speeds. This is how has been achieved that many satellites can adjust their orbit.
A key piece is missing. In order to start this electromagnetic field, an energy source is needed, which is normally obtained through solar panels. However, to go to very distant places where the Sun does not reach so easily, it would be necessary to look for alternatives. For this reason, NASA scientists consider that this ion engine should be complemented with the nuclear thrusters that Both this agency and others have been studying for some time.
In the case of NASA, They have made a lot of progress with Space Reactor-1 Freedoma nuclear-powered spacecraft, whose first launch is scheduled for 2028.
Investment is needed. In order to scale what has been achieved so far, strategic investments will have to be made, as NASA Administrator Jared Isaacman has already pointed out. in statements collected by Space. The scale they want to make is not small, so they are still waiting to receive adequate financing. In the meantime, you can at least be proud that the first 5 firings of this initial prototype went perfectly.
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