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Recently, the State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, will take a crucial step towards this "dream"
.
On July 21, the international academic journal "Nature" published the latest achievements of Shanghai scientists in the form of a cover article-the first in the world to complete the experimental verification of the principle of a desktop free electron laser device
Let electrons accelerate " long-distance running" into " sprinting"
When it comes to accelerators, whether it is the Large Hadron Collider in Europe or the soft X-ray free electron laser device in Shanghai, they all give the impression of being a giant
.
"At present, there are only eight X-ray free electron laser devices that have been built and are in operation in the world.
Almost every device has an experimental machine in short supply
Can such large scientific devices be turned into low-cost "small devices"? If it can be realized, not only will it be more convenient for scientists to do experiments, but it will also be expected to be more widely used in the industrial and medical fields
.
At the beginning of this century, developed countries began to explore the miniaturization of X-ray free electron laser devices
.
In 2012, the research team of the Shanghai Institute of Optics and Mechanics of the Chinese Academy of Sciences, with the support of the National Natural Science Foundation of China's major instrument project, started with the construction of temporary data collection devices in containers, and challenged the development of "desktop computers"
Researchers are adjusting the light source of the miniaturized free electron laser device (Photo by Xu Qimin/ )
Wang Wentao, a researcher at the Shanghai Institute of Optics and Mechanics of the Chinese Academy of Sciences, the main completer of the project, explained that the traditional X-ray free electron laser device is bulky.
The use of super-strong and ultra-short lasers to accelerate electrons is more than a thousand times more efficient than radio frequency electron accelerators.
Therefore, it can turn a kilometer-level "long-distance run" into a few-meter "short run", thereby greatly reducing the scale of the installation
.
Fighting from 300 days to 3000 days, and finally achieve " International First"
In the laboratory of the Shanghai Institute of Optics and Mechanics of the Chinese Academy of Sciences in Jiading, the reporter saw that from the electron accelerator cavity to the undulator, the device is only about 12 meters long, but its electron accelerator part has only a 1-meter square cavity
.
Schematic diagram of miniaturized free electron laser device
In this cavity, a super-strong and ultra-short laser passes through a mass of plasma, like the wake of a speedboat, engulfing part of the electrons away.
These electrons can obtain super-high energy in an instant.
It is the electron acceleration mechanism of the wake field driven by the super-strong and ultra-short laser
.
In 2004, scientists from the United States, France, Britain and other countries proved that this mechanism can indeed obtain high-energy electron beams for the first time through experiments
.
"Through nearly ten years of hard work, we finally took the lead in the world to verify that this method can not only obtain high-quality high-energy electron beams, but also generate free electron lasers, making it a weapon for scientists to explore the unknown world
The key component of the device- electron acceleration cavity (Xu Qimin/ photo)
International colleagues highly praised this work as "another milestone achievement since the "Dream Beam" report" in the laser wake field field, and "a major technological breakthrough
.
"
"At that time, our slogan was'Working overtime for 300 days, and vowing not to pay back without seeing the light.
' We did not expect the experiment to be done for more than 3,000 days before we finally got today's results
.
" said Wang Wentao, two academicians of the Chinese Academy of Sciences at the Shanghai Institute of Optics and Mechanics, Chinese Academy of Sciences.
In the future, the research team will further increase the output power and photon energy of the free electron laser, and use it as an important part of the ultrafast chemistry and macromolecular dynamics research platform in the "Xihe" experimental device, providing open sharing