A form of electric propulsion known as Hall thrusters — a type of ion thruster — may actually pack more bang for the buck than expected.
Hall thrusters have conventionally been used to adjust the orbit of satellites. But according to a new study, they could also be scaled up for interplanetary commutes like a crewed mission to Mars, something that was considered unlikely until now.
The belief so far has been that Hall thrusters — which work by accelerating ionized particles of gas like xenon using a magnetic field — can't drive enough propellant atoms at smaller sizes. In other words, they're fairly weak, and getting more power out of them would require a larger Hall thruster too impractical to fit on crewed spacecraft.
"People had previously thought that you could only push a certain amount of current through a thruster area, which in turn translates directly into how much force or thrust you can generate per unit area," explained study author Benjamin Jorns, an associate professor of aerospace engineering at the University of Michigan, in a statement.
The bottleneck arises from a function that Jorns calls a "buzz saw" surrounding the channel that the propellant atoms are driven through. That saw is needed to turn those atoms into positively charged ions that produce thrust.
But anything more than the small amounts currently used — and the buzz saw falls apart, leaving you with a useless neutral gas, in addition to overheating the engine.
"It's like trying to bite off more than you can chew," Jorns elaborated. "The buzz saw can't work its way through that much material."
Jorns didn't accept that common thinking, however. He and his team simply souped up a xenon-powered Hall thruster by about a hundred times and tried cooling it with water. Surprisingly, they found that it still operated at 49 percent efficiency and outputted up to 37.5 kilowatts, compared to its original efficiency of 62 percent when operating at only a measly nine kilowatts.
This time, using the lighter noble gas krypton as a propellant, they were able to reach 45 kilowatts, with an even greater efficiency of 51 percent, while producing 1.8 Newtons of thrust — not far off from the most powerful Hall thruster in the world, the X3, which is far larger. That's certainly punching above its weight.
"This is kind of a crazy result because typically, krypton performs a lot worse than xenon on Hall thrusters," said Leanne Su, an aerospace engineer at the University of Michigan, in the statement.
"So it's very cool and an interesting path forward to see that we can actually improve krypton's performance relative to xenon by increasing the thruster current density."
Their findings show that it may be possible to use smaller Hall thrusters for crewed spacecraft in the future, as large ones don't leave much room for their passengers. According to Jorns, crews could reach Mars or even the far side of the Sun using an array of thrusters that produce about a megawatt's worth of thrust.
But the next hurdle, Jorns said, is figuring out how to cool them in space — which is a lot harder, given the lack of atmosphere for exhausting generated heat.
More on space: European Space Agency Halts Plans to Send Astronauts to Chinese Space Station
The post Test Suggests Ion Thrusters Could Power Crewed Interplanetary Missions appeared first on Futurism.
Read the original here:
Test Suggests Ion Thrusters Could Power Crewed Interplanetary Missions
- Futurist Serata featuring artist Luca Buvoli at Brown (Nov. 20) - November 7th, 2009 [November 7th, 2009]
- FUTUR1SM00GGI - November 8th, 2009 [November 8th, 2009]
- ‘Futurism on Film’ Series this month in NYC - November 8th, 2009 [November 8th, 2009]
- Schedule of Futurist Events in NYC (PERFORMA 09: Nov 1-22) - November 8th, 2009 [November 8th, 2009]
- ‘Futurismo/Futurizm: The Futurist Avant-Garde in Italy and Russia’ (Nov. 13 + 14) - November 8th, 2009 [November 8th, 2009]
- ‘Beyond Futurism: F.T. Marinetti, Writer’ conference at Columbia (Nov. 12+13) - November 8th, 2009 [November 8th, 2009]
- Futurism and Cars at the Museo Nicolis - November 8th, 2009 [November 8th, 2009]
- MoMA Film Series Marks Centenary of Futurism with Films - November 8th, 2009 [November 8th, 2009]
- ‘Bergson+Futurism. Speed in thought’ - Madrid (Nov. 5) - November 8th, 2009 [November 8th, 2009]
- ‘The Future in Five Senses: Echoes of Italian Futurism in New York Architecture and Design’ Nov. 16th NYC - November 8th, 2009 [November 8th, 2009]
- New World-Wide Climate Treaty in 2010 More Likely - November 8th, 2009 [November 8th, 2009]
- Tar Sands CCS Myth Shattered - November 8th, 2009 [November 8th, 2009]
- Smart Grid and Smart Meters Get Big Grants - November 8th, 2009 [November 8th, 2009]
- Pollution Makes Methane Even More Dangerous - November 8th, 2009 [November 8th, 2009]
- Climate Change Bill Hearing Video - November 8th, 2009 [November 8th, 2009]
- New Satellite to Monitor Water and Plant Growth - November 8th, 2009 [November 8th, 2009]
- Spiritual Battle Awaits the Deniers and Skeptics - November 8th, 2009 [November 8th, 2009]
- Effects of Climate Change are Observed World-Wide - November 8th, 2009 [November 8th, 2009]
- Get Yer Global Warming Science Here - November 8th, 2009 [November 8th, 2009]
- TckTckTck Wake up Call — Delay Kills - November 8th, 2009 [November 8th, 2009]
- Canada’s Awful Gold Rush - November 8th, 2009 [November 8th, 2009]
- Climate Change Talks Spark Global Backlash by Businesses - November 8th, 2009 [November 8th, 2009]
- World May Need Extra Year for Climate Treaty - November 8th, 2009 [November 8th, 2009]
- Senator Boxer Moves Climate Bill Despite Republican Obstructionism - November 8th, 2009 [November 8th, 2009]
- Lights out for incandescent lights? - November 8th, 2009 [November 8th, 2009]
- Sutures from Bacteria - November 8th, 2009 [November 8th, 2009]
- Remote-Controlled Pigeons - November 8th, 2009 [November 8th, 2009]
- Apple Announces iPhone Release Date - November 8th, 2009 [November 8th, 2009]
- UK Government Envisions a Grim Future - November 8th, 2009 [November 8th, 2009]
- Top Ten Emerging Technologies for the Environment - November 8th, 2009 [November 8th, 2009]
- DIY Mobile Networks - November 8th, 2009 [November 8th, 2009]
- Stem-Cell Treatment Cures Type 1 Diabetes - November 8th, 2009 [November 8th, 2009]
- Is Tesla Getting the Electric Car Right? - November 8th, 2009 [November 8th, 2009]
- The Future of TV News - November 8th, 2009 [November 8th, 2009]
- Bruce Sterling on Earth-Friendly Pervasive Computing - November 8th, 2009 [November 8th, 2009]
- First Step Toward Organ Regeneration in Humans - November 8th, 2009 [November 8th, 2009]
- IBM's "Five in Five" - November 8th, 2009 [November 8th, 2009]
- Outsourced Journalism - November 8th, 2009 [November 8th, 2009]
- Is True Global Democracy the Next Great Political Movement? - November 8th, 2009 [November 8th, 2009]
- The Risks of Autonomous Robots - November 8th, 2009 [November 8th, 2009]
- Microsoft Introduces "Tabletop" PC - November 8th, 2009 [November 8th, 2009]
- Britain Piloting First Biofueled Train - November 8th, 2009 [November 8th, 2009]
- Self-Healing Plastic - November 8th, 2009 [November 8th, 2009]
- Bird Population Falls Over Past 40 Years - November 8th, 2009 [November 8th, 2009]
- The iPhone Revolution? - November 8th, 2009 [November 8th, 2009]
- The End of "Cheap Food"? - November 8th, 2009 [November 8th, 2009]
- How to Stop -- Or Live With -- Global Warming - November 8th, 2009 [November 8th, 2009]
- MIT Demonstrates "Wireless Electricity" - November 8th, 2009 [November 8th, 2009]
- Unintended Consequences of Biofuels - November 8th, 2009 [November 8th, 2009]
- Time to Focus on the Big Picture in Copenhagen - December 12th, 2009 [December 12th, 2009]
- Protests in Copenhagen - December 12th, 2009 [December 12th, 2009]
- Mario Guido Dal Monte exhibit - December 13th, 2009 [December 13th, 2009]
- Futurism News Bulletin, xvi - December 13th, 2009 [December 13th, 2009]
- Viva il Futurismo! (video trailer) - December 13th, 2009 [December 13th, 2009]
- 3 exhibits in Gorizia! - December 13th, 2009 [December 13th, 2009]
- Forthcoming: ‘Antidiets of the Avant-garde’ by Cecilia Novero - December 13th, 2009 [December 13th, 2009]
- Pubblicità e propaganda. Ceramica e grafica futuriste at the Wolfsoniana - December 13th, 2009 [December 13th, 2009]
- Balla’s home scheduled to open in 2010 - December 13th, 2009 [December 13th, 2009]
- Futurismo a Savona - December 13th, 2009 [December 13th, 2009]
- ‘Zang Sud Sud’, Cosenza - December 13th, 2009 [December 13th, 2009]
- Conference in Rome (Dec. 10) - December 13th, 2009 [December 13th, 2009]
- Climate Hackergate: A Well-Orchestrated Campaign of Harassment - December 13th, 2009 [December 13th, 2009]
- The Sad Story of Cap and Trade - December 13th, 2009 [December 13th, 2009]
- How to Waste Trillions on Capturing Carbon - December 13th, 2009 [December 13th, 2009]
- Smack the Email Hack Attack - December 13th, 2009 [December 13th, 2009]
- EPA About to Declare CO2 a Public Danger - December 13th, 2009 [December 13th, 2009]
- Copenhagen Summit Starts with Virtually There Media - December 13th, 2009 [December 13th, 2009]
- Climate Scientist Gets Blunt on Trading Scheme - December 13th, 2009 [December 13th, 2009]
- One Climate Change Editorial in 56 Newspapers, 45 Countries - December 13th, 2009 [December 13th, 2009]
- This Decade Will be Hottest Ever on Record - December 13th, 2009 [December 13th, 2009]
- Divide and Conquer - December 13th, 2009 [December 13th, 2009]
- Leave the Coal in the Hole! - December 13th, 2009 [December 13th, 2009]
- COP15: Two Agreements Coming - December 13th, 2009 [December 13th, 2009]
- Climate and Copenhagen News December 10 - December 13th, 2009 [December 13th, 2009]
- Sea Level Already Rising on Atlantic Coast - December 13th, 2009 [December 13th, 2009]
- ‘Umbria Veloce’ in Perugia - December 14th, 2009 [December 14th, 2009]
- An Instable CO2-Filled Ocean - December 14th, 2009 [December 14th, 2009]
- ‘Futurismi a Ravenna’ opens Dec. 19 - December 15th, 2009 [December 15th, 2009]
- ‘Futurism and the Technological Imagination’ – 30% discount until Jan. 15 - December 15th, 2009 [December 15th, 2009]
- Protecting Our Lungs at Copenhagen - December 15th, 2009 [December 15th, 2009]