A tiny gold-plated cylinder called a hohlraum holds the deuterium-tritium fuel capsule in the National Ignition Facility target chamber, where the energy from 192 high-powered lasers is converted to thermal X-rays. The X-rays heat and ablate the plastic surface of the ignition capsule, causing a rocket-like pressure on the capsule and forcing it to implode and ignite.
Researchers at Lawrence Livermore National Laboratory (LLNL) have successfully conducted an important round of successful laser experiments at the National Ignition Facility (NIF), validating key computer simulations and theoretical projections relevant to the plasma and X-ray environment necessary to achieve ignition.
NIF, which is more than 80 percent complete, is a 10-story building in which 192 laser beams are focused on a tiny target inside a 30-foot diameter aluminum-lined chamber. Eight beams already have been commissioned. When fully operational (currently scheduled for mid-2009), NIF will be used to study and achieve ignition, resulting in a brief burst of energy that is greater than was used in its creation. Ignition is a long-sought achievement that has never occurred under controlled conditions in a laboratory setting.
The series of experiments is described in a Nov. 18 Physical Review Letters article, whose lead author was the Lab’s Eduard Dewald.
Bob Hirschfeld | EurekAlert!
From rocks in Colorado, evidence of a 'chaotic solar system'
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Prediction: More gas-giants will be found orbiting Sun-like stars
22.02.2017 | Carnegie Institution for Science
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The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
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Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
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