February 16, 2014
Mohenjo
Science
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America’s multibillion-dollar, laser-blasting fusion machine has gotten more energy out of a smidgen of fuel than was put into it — but the most significant thing is how it was done.
The latest experiments, reported in this week’s issue of the journal Nature, marked a first for the National Ignition Facility at Lawrence Livermore National Laboratory in California. They’re the first laser shots to produce a net gain in energy under any definition, and they’re also the first to show evidence of a mechanism that’s essential if controlled fusion is ever to become a reality.
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A closeup from the National Ignition Facility shows a cutaway view of a gold cylinder known as a hohlraum, with a spherical fusion fuel capsule gleaming inside. The hohlraum measures about half an inch (1 centimeter) in height, and the capsule is about a tenth of an inch (2mm) in diameter. Beams of light from 192 lasers are directed at the capsule to cause an implosion.
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October 9, 2013
Mohenjo
Human Interest
"perfect power", amazon, business, Business News, California, fox news, fusion, fusion reaction, fusion welds, fusion welds atoms together, holy grail, holy grail for physicists, Hotels, human-rights, hydrogen fuel, Lawrence Livermore National Laboratory, National Ignition Facility, Physicists, research, Science, Science News, technology, Technology News, travel, ultrapowerful laser system, vacation, world's energy problems
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Researchers have reportedly taken one small yet giant step towards “perfect power” — fusion, the process that powers the sun and may ultimately solve the world’s energy problems.
Fusion is similar to fission, where atoms are split releasing massive amounts of energy. But instead of being torn apart, fusion welds atoms together. It’s a perfect power because more energy is released than used, and a sort of holy grail for physicists.
To attempt it, scientists at the National Ignition Facility at Lawrence Livermore Labs in California use an ultrapowerful laser system, which melds 192 laser beams into a single incredible burst of energy that heats and compress a capsule of hydrogen fuel to the point at which fusion take place.
The result of a late September test: the amount of energy released through the fusion reaction was greater than the amount of energy used, the BBC reported.
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Before each experiment, a positioner precisely centers the target inside the target chamber and serves as a reference to align the laser beams. (Lawrence Livermore National Laboratory)
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