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According to the British "Daily Mail" on July 17 (Beijing time), the National Ignition Facility (NIF) provided 500 megawatts of peak power and 1.85 megajoules of ultraviolet laser pulses with 192 laser beams on July 5. . The laser pulse lasted only 23 billionths of a second, but this peak power is more than 1,000 times greater than the power consumed at any time in the United States.
Experiments conducted by NIF in March this year showed that it may be close to the goal of "fusion ignition." This time, compared with March, the energy generated increased from 411 MW to 500 MW. And the same as that test, and the target chamber is also empty. Scientists said that in the next two years, the 192 lasers will be fired toward the hydrogen fuel balls, so as to truly achieve ignition.
MIT scientist Richard Petraso said: "The 500 megawatt laser launch is a remarkable achievement, and scientists will create in the laboratory environments that were previously only present inside the star."
Raymond Janez, a professor at the University of California, Berkeley, said: "This is the most powerful and best-controlled laser beam in the world." According to a media release, energy release is 1% higher than forecast. And each bundle has a similar average accuracy.
The NIF concentrated 192 laser beams on a peanut-sized target loaded with heavy hydrogen fuel. When these pulses impinge on the target reaction chamber, X-rays are generated and the X-rays concentrate on a plastic capsule that is filled with heavy hydrogen fuel in the center of the reaction chamber. The NIF team estimates that the X-ray will heat the fuel to 100 million degrees and apply enough pressure to make the heavy hydrogen core react to the fusion, releasing more than 15 times the input energy.
Nuclear fusion does not produce the long-term and high-level nuclear radiation, nuclear waste, and greenhouse gases that occur during nuclear fission, and it does not substantially pollute the environment. Therefore, since the 1950s, "controlled" nuclear fusion has become a field of clean energy for humans. "Holy Grail".
However, the NIF project is not without controversy: it is related to some US weapons programs because of the nuclear fusion process in the hydrogen bomb; it also cooperates with the US Inventory Management Plan, which is mainly used to ensure that the United States "The safety and reliability of nuclear weapons. There are also voices saying that nuclear fusion research has dispersed some of the research funds that have been proven to be reliable technologies such as wind and wave energy. (Reporter Liu Xia)
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