Using the world's largest laser, the researchers coaxed fusion fuel for the first time to heat itself beyond the heat they zapped into it, achieving a phenomenon called a burning plasma that marked a stride toward self-sustaining fusion energy.
"If you want to make a camp fire, you want to get the fire to hot enough that the wood can keep itself burning," said Alex Zylstra, an experimental physicist at Lawrence Livermore National Laboratory - part of the U.S. Energy Department - and lead author of the"This is a good analogy for a burning plasma, where the fusion is now starting to become self-sustaining," Zylstra said.
At very high temperatures, the nucleus of the deuterium and the nucleus of the tritium fuse, a neutron and a positively charged particle called an "alpha particle" - consisting of two protons and two neutrons - emerge, and energy is released.The Target Chamber of the National Ignition Facility is seen at the Lawrence Livermore National Laboratory in Livermore, California, U.S., in an undated handout image.
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