Ignition is needed to make fusion energy a viable alternative energy source, but has yet to be achieved1.
A key step on the way to ignition is to have the energy generated through fusion reactions in an inertially confined fusion plasma exceed the amount of energy deposited into the deuterium–tritium fusion fuel and hotspot during the implosion process, resulting in a fuel gain greater than unity . Here we report the achievement of fusion fuel gains exceeding unity on the US National Ignition Facility using a ‘high-foot’ implosion method
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature13008.html
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