NASA-backed fusion engine could cut Mars trip down to 30 days
NASA, and plenty of private individuals, want to put mankind on Mars. Now a
team at the University of Washington, funded by the space agency, is about
to start building a fusion engine that could get humans there in just 30
days and make other forms of space travel obsolete.
"Using existing rocket fuels, it's nearly impossible for humans to explore
much beyond Earth," said lead researcher John Slough, a UW research
associate professor of aeronautics and astronautics in a statement. "We are
hoping to give us a much more powerful source of energy in space that could
eventually lead to making interplanetary travel commonplace."
The proposed Fusion Driven Rocket (FDR) is a 150-ton system that uses
magnetism to compress lithium or aluminum metal bands around a
deuterium-tritium fuel pellet to initiate fusion. The resultant microsecond
reaction forces the propellant mass out at 30 kilometers per second, and
would be able to pulse every minute or so and not cause g-force damage to
the spacecraft's occupants.
The spent fuel pellet is ejected behind the motor to provide propulsion, and
because the whole process is magnetically controlled there's relatively
little wear and tear on the engines. A pellet the size of a grain of sand
would provide the same propellant as a gallon of conventional rocket fuel.
All this requires electrical power to control and contain the reaction, but
Anthony Pancokti, an advanced propulsion engineer with the team, told The
Register that the advantages of magnetic inertial confinement fusion (over
that requiring massive lasers, for example) mean that the spacecraft could
power itself on solar energy alone.
"It's very scalable; we can achieve fusion at a much smaller scale," he
said. "We could run the designed engine off 200KW of solar panels, which is
about the same power as generated by the panels around the International
Space Station"
Using the FDR system, flight times to the Red Planet could take between 30
and 90 days, compared to over eight months that it took to send the
Curiosity rover to Mars. The 30-day trip would require three days of engine
operation to get the spacecraft up to speed and another three to slow it
down into orbit around Mars.
Such a motor would also be considerably cheaper to launch than a chemical
rocket system, since there is much less fuel to hoist out of the gravity
well before it starts a trip. The proposed design for a 150-ton spacecraft
would allow around a third of that mass to be used for cargo - human or
otherwise - and the reduced flight time would reduce the exposure of
astronauts to the effects of solar radiation.
Many space missions use aerobraking - using the friction of a planet's
atmosphere to slow down - as a way of saving the propellant. This drive,
however, is so efficient that aerobraking makes little sense, since the
weight of the shielding needed for the maneuver is greater than the
propellant FDR needs to slow down.
The FDR fusion drive prototype in a Washington lab
The team has tested all the parts of the FDR in the lab, and is now going to
start building a fully working engine that brings these elements together,
thanks to funding from NASA's Innovative Advanced Concepts Program, which
aims to fund long-term space technology.
The FDR is one of only ten projects to get Stage Two funding from the
program. This $600,000 award will provide the proof-of-concept FDR system
over the next 18 months, and a working spacecraft would be ready as soon as
2020, Pancokti predicted - but if NASA wanted to throw money at the project,
this timescale could be cut.
Given the tight financial strictures of the US government this is unlikely,
but the FDR engine has the potential to make chemical or ion drives for
spacecraft as obsolete as the steam engine for earth-bound transportation.
http://www.theregister.co.uk/2013/04/10/nasa_fusion_engine_fast_mars_trip/
Will this thing work?
Comment?
Gerry
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