The only large scientific device in the country, young people ＂bare hands＂ rubbing out of the ＂Joint Experiment of Heaven and Earth＂ for solar physics
China Youth Daily · Zhongqing.com reporter Wang Yijie Video Zhou Guanling
In a small courtyard at the Handan Campus of Fudan University, there is a “town artifact” -the Shanghai electronic beam ion installation.The reason why it is an artifact is mainly because of the only large scientific device in the country and only 8 units in the world. It is almost the only one that can stabilize the daily crowned high -temperature plasma, so as to carry out the “Joint Experiment of the Heaven and Earth” of the solar physics.installation.
China Youth Daily · Zhongqing.com reporters learned that this “big guy” occupying more than 300 square meters of space is not a business finished product that is bought, but a component of the professors and doctoral teams of the Department of Nuclear Science and Technology of Fudan University.Designed and assembled one by one, they rubbed out for more than 10 years.
“It was the earliest when it was a device for our military research to provide data for some special experiments. With the development of my country’s science and technology, we now use it to do it? More expansion research.” Fudan University. “Fudan University Yang Yang, an associate professor of the Department of Nuclear Science and Technology, participated in the update of this experimental device. It was one of the “Four King Kongs” of the “Four Diamonds” at the time -at the time, 4 Fudan Nuclear Scientific Research was born in the project chief of the project. Under the leadership of scientists, for more than 4 years, it has been upgraded to build a new super electronic beam ion trap device.
at present?This huge machine can be used to simulate the special environment of the starring area of the star surface.It has an irreplaceable advantage -it can achieve extremely high vacuum, super magnetic fields and maximum limit of 150 million degrees Celsius in the 1 cubic centimeter space, and separate from the wall (1 cubic centimeter)However, the ultra -low temperature area of minus 270 degrees Celsius coexist.It can be said that it is a rare square inch in the universe.
“The extension of this machine has eight functional pipelines. These pipelines are pointing to a core area in the middle, that is, about 1 cubic centimeter of space. We?The environment of the crown “Yang Yang told reporters that this is it?It is the charm of science -in order to study a certain problem, you may need to build a special space of 1 cubic centimeter in a large device of hundreds of square meters and do it in this small space?Experiments, data.
And this space can only be rubbed out through your own “bare hands”, because scientific innovation is the forefront?There is no ready -made road.
Yang Yang introduced that many modules in this device at that time were the first in the country.You can’t buy ready -made finished products, nor have foreign experiences.The “one brick and one tile” of this device depends on the teachers and classmates to design drawings by themselves, and find the factory to process and produce themselves.An important job of the “Four King Kong”, right?Go to the factory to squat, together with the workers, the workpieces that need a little bit by little, process, process and make through the process.After the workpiece returns, students are required to install it on this device by themselves.
The installation process itself?, Also face various problems.Each problem challenges the creativity of teachers and students.Once, when installing a component, an sealing part was accidentally broken, and a fastener bolt was dropped.Coincidentally, this bolt is this bolt?It just rolled near the key part of the 1 cubic centimeter.
“Itself? The intensity of the imported sealing parts we purchased? It is not as good as nominal. It suddenly breaks after the force, and the associated bolt is?It may lead to a complete failure of the experiment. “The space we need to create has a super uniform magnetic field, a bolt? Will it greatly change the magnetic field environment of the local area and let the effort?
The conventional method should be taken out of this bolt, right?To remove the entire device that has been built, and the appearance of this device looks like a simple “boiler can”, just the core area of the light inside?There are as many as five or six floors.The students roughly calculated, the disassembly time is at least 1 year?EssenceIn order to take out this bolt, a group of doctoral students and professors gathered together for two weeks.In the end, they took the bolts safely with the “vacuum cleaner Dafa”.
Although this method is similar to a vacuum cleaner, it has high requirements for suction power. Because the pipeline is complicated, the straws that can only accommodate 8mm diameter can enter, and the bolts cannot be sucked directly from the tube.To this end, Fudan teachers and students adopted the oil -free dried drying pump and the high -strength PVC pipe, and processed the transfer interface by themselves.However, the position of the bolt is too deep to see the positioning.So, how many students have tried to buy it again?The flexible endoscope for surgery, right?Doing it?Like surgery, the two people cooperate with this endoscope and straw. After the seven turns around, they successfully sucked the bolt at the pipe mouth and took it safely.
Yang Yang told reporters that after construction?In the process of the new instrument device, “accident” is actually a normal state.Each “accident” tests the ability and level of teachers and students to solve problems.
For example, this machine must create a low -temperature environment below minus 270 degrees Celsius, and it is inevitable that the national strategic resource is used to use the national strategic resources.my country itself?Without a large amount of ore reserves, liquid pupae used by scientific research institutions and medical institutions must be imported from abroad.But because this is a rare renewable resource in the world, it is not easy to buy.
“For a while, foreign companies suddenly stopped the sales liquid to us, which caused us to have been able to buy it for almost a year. Can’t do experiments?” Yang Yang said, at this time, the Fudan nuclear physics team?”Self -reliance” must be considered.They developed a set of liquid recycling systems, using two ultra -low temperature refrigeration machines, and one core area inserted into the large experimental device to maintain low temperature and reduce evaporation. A condensing system that connected to the upper layer was responsible for “recycling” liquid 氦.Open source (recycling) throttling (reduced evaporation) dual -pronged approach, allowing the reserves of liquid ponds not only to achieve “zero evaporation”, but if the sorcene is injected, it can also achieve negative evaporation and condense the liquid cricket.This greatly reduces the dependence of large devices to liquid resources.
“That’ s? Like the Freman in the movie “Sand Dunes”, the Freman people are wearing a distilled element that is specifically used to absorb and transform the water excreted from the human body? As can you imagine, our machine also has such a ‘clothes”It can allow our liquid to achieve zero evaporation.
Yang Yang said that a major scientific device in “rubbing” looks very hard and brain -consuming cells, but in the process, it can also help students even give birth to many new ideas.For example, before?The recycling system of liquid 收 later?It is applied to the industrial field, and some young people participating in the project have also been inspired by entrepreneurship.The platform and opportunities of young people rubbing the device are very precious for us. “
(Source: China Youth Daily Client)
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