“Nuclear slapshots” could propel a spacecraft to Mars in just weeks

By | July 2, 2012

Scientists at UAHuntsville have proposed a scheme that could see a spacecraft propelled through space by using a pulsed nuclear fusion system. To do so, a series of “nuclear slapshots” would apply magnetic pulses in order to slam nuclei into each other inside a hockey puck like structure made of a special lightweight salt. Should it work, this hot gas-propulsed “flying tea kettle” would get us to Mars in weeks rather than months.

Physicists at The University of Alabama in Huntsville’s Department of Mechanical and Aerospace Engineering are developing the “Z-pinch” – a small, lightweight propulsion system. Jason Cassibry, an associate professor of engineering at UAHuntsville, and his team are attempting to drive a hollowed-out puck in on itself, fusing lithium and hydrogen atoms. In other words, nuclear fusion – the process where four hydrogen atoms combine to make one helium atom in which a small amount of matter is converted into pure energy.

The “pucks” themselves are about two inches wide and an inch thick, smaller than a regulation three-inch hockey puck. They are made of lithium deuteride, the lightest metal combined with the middleweight form of the lightest element. And like a sharpshooter in hockey, the idea is to dig the blade of the hockey stick into the ice to bend the shaft, storing energy for a quicker, more powerful snap against the puck.

But to get it to work, the researchers will need to get heavy hydrogen (one proton plus one neutron) to fuse with each other or with lithium – something that’s easier said than done as getting nuclei to meet is a monumental task. To that end, the researchers will experiment with the Decade Module Two, or DM2, a pulsed power design used by the Department of Defense for weapons effects testing in the 1990s.

The DM2 is comprised of banks of capacitors that store an electrical charge for release on demand. It strips the target into an electrified gas or plasma. The Z-pinch effect happens when electricity flowing through it generates a magnetic field that compresses the plasma – what is equivalent to 20% of the world’s power output in a tiny bolt of lightning no bigger than a finger. This is the power slapshot, a tremendous amount of energy in a tiny fraction of time, just a hundred billionths of a second.

The tests at DM2 will serve as proof of concept, which would allow researchers to progress to the next level of development. At the end of the day, the researchers are hoping to “break-even”, producing more energy than is consumed – the magic that is fusion power. …

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