Section 246

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Chapter 217 Tokamak, a big problem

At the gate of the Institute of Plasma, Li Jiangan, Zhao Zhanyou and other leaders of the institute stood here, welcoming a young man who had just stepped out of a car in front of him.

As for this young man, he is naturally Xiao Yi.

"Professor Xiao, welcome to your visit again!"

Li Jiangan walked up and shook hands with Xiao Yi.

"Hello, Academician Li."

Xiao Yi also nodded to him, and then saw Zhao Zhanyou next to him and said hello: "Director Zhao."

Zhao Zhanyou smiled at Xiao Yi.

This time, Xiao Yi came to the Institute of Plasma after being invited by them. As for the reason, it was naturally his paper.

"Professor Xiao, I have read your paper. I really don't know how to describe the multi-fluid NS equation model you developed in that paper."

After Li Jiangan said hello, he began to praise Xiao Yi's paper.

"That model can not only help us analyze the Greenwald limit, but also help us study various issues such as the internal structural arrangement of the tokamak device. I think with your ability, you can be a researcher in our Institute of Plasma. More than enough.”

Zhao Zhanyou, who was next to him, also nodded repeatedly and said: "Yes! Professor Xiao, you may not have imagined how excited our Academician Li was after we read your paper that day. He kept saying that you are the dawn of our country's nuclear fusion future, and why? If China can achieve nuclear fusion within 50 years, it will definitely fall on you."

Li Jiangan next to him glared at Zhao Zhanyou and said, "Don't talk nonsense here, just talk about it in private. If you say it now, aren't you putting pressure on Professor Xiao?"

Then he said apologetically to Xiao Yi: "Sorry, Professor Xiao, this person has always been like this, a bit frivolous. Don't take this to heart."

"Of course, I do think that if you can study nuclear fusion, you may really be able to make a huge breakthrough in this field."

"Just because you are able to come up with such a model in order to solve the Greenwald limit, I think this nuclear fusion should be conquered by you!"

Xiao Yi looked at Academician Li's sincere expression with a look of helplessness and amusement.

These two people sang a double act...

Isn't it a bit too easy to see through?

Last time, I wanted to invite him to cooperate and build a new tokamak device. Now I invite him this time, hoping that he can join the research on nuclear fusion?

Um……

He smiled and said: "Haha, thank you Academician Li for your trust. Of course, controllable nuclear fusion is indeed a difficult subject. If you really want to devote your mind to this matter, it will take a lot of time. , I personally prefer to do it step by step.”

Hearing what Xiao Yi said, Li Jiangan could only say helplessly: "What you said does make sense. Such a problem cannot be solved overnight."

Xiao Yi smiled and said: "Okay, you two, you invited me here today, isn't it to verify the limits of Greenwald?"

Li Jiangan came back to his senses, then smiled and said: "Oh, yes, yes, I almost forgot about the real thing."

"Then let's go to the research institute now."

Then they stopped talking nonsense and entered the research institute.

…

The main purpose of Xiao Yi coming here today is to discuss how to verify the new Greenwald limit proposed in Xiao Yi's paper.

In physics, a theory is just a theory. Whether it can be implemented ultimately depends on the experimental results.

As for how to verify it experimentally, you need to ignite the fusion reactor.

"It just so happens that we are planning to conduct an ignition experiment before the Chinese New Year. There are almost ten days left. Now that we have the results of your paper, we can just do a verification and get a top publication. ”

When he came to the office, Li Jiangan said to Xiao Yi, and at the same time he took out a piece of information and handed it to Xiao Yi.

Xiao Yi took the information and took a look.

What is written in this document is about the plan to verify the new Greenwald limit.

The plan is actually relatively simple, it is nothing more than controlling the internal plasma density.

The first is parameter selection. Based on the simulation results, select the appropriate plasma current and small radius to reach the new Greenwald limit density.

The current tentative plasma current is 1MA and the minimum radius is 0.45 meters, which is also based on the design parameters of the Oriental Hyperring.

When ignition occurs, the plasma discharge is carried out according to the set parameters, and the plasma density is gradually increased until the new Greenwald limit density is reached.

"That is to say, under these parameters, in the Eastern Superring, the density of plasma must reach 2.12×10^20/m^3, which is equivalent to reaching the new Greenwald limit."

Xiao Yi made a simple calculation in his mind and came to this result.

"Yes." Li Jiangan nodded, but then he smiled and said: "Of course, in fact, as long as it can exceed 1.57, it will be fine. After all, every part exceeded after that is a new limit."

Xiao Yi also smiled.

The original Greenwald limit on the Eastern Hyperring is almost 1.57×10^20/m^3.

Now after increasing by 35%, it is 2.12×10^20/m^3.

Therefore, as long as it can exceed 1.57, it is indeed a new limit.

He said: "Then I'm looking forward to the day of ignition."

"Well, I'll definitely invite you to visit when the time comes." Li Jiang'an said, "By the way, I'll let you experience pressing the ignition button."

"Oh?" Xiao Yi became interested: "It does sound interesting, like igniting a rocket?"

Li Jiangan smiled and said: "That's not the case. People's rocket ignition is real ignition. Our ignition is just passing in current, and then after a few dozen seconds, the plasma temperature in the cavity will reach 100 million degrees. Well...the temperature is much higher than that of the rocket, but it doesn't look as menacing as the rocket."

"Otherwise, when the rocket is ignited, it can attract so many people to watch. Our nuclear fusion ignition is the only one we can watch here."

Xiao Yi laughed and said, "If you announce the ignition time, you might be able to attract a lot of people to come and watch."

"Then forget it."

Li Jiangan shook his head, "Our place can't accommodate so many people, and when people hear that nuclear fusion may cause radiation hazards, they run away a long time ago."

"That's true."

Xiao Yi shrugged.

Nuclear fusion will of course produce radiation, and the neutrons generated during the deuterium-tritium fusion reaction are a very harmful radiation source.

However, a neutron shielding layer is generally installed around the tokamak device, so there is basically no need to worry about nuclear radiation.

Of course, they know from a scientific perspective that these radiations will not harm the human body, but for other people, of course, they can run as far as they want.

It's like there was a place where a nuclear power plant was going to be built, but when the surrounding residents learned about it, they all expressed opposition. In the end, the nuclear power plant couldn't be built.

However, from the public's point of view, this kind of thing is normal. After all, not many people want to live next to a nuclear power plant. Even if it is really safe, they will feel a little uncomfortable.

"Professor Xiao."

At this time, a voice came from the door, and Zhao Zhanyou walked in with a pile of documents in his hands.

"This is what you want, the overall structural data of our Eastern Super Ring."

With a click, Zhao Zhanyou put these documents on the table, patted them, and said to Xiao Yi: "This is a confidential document of our plasma institute! If nothing else, just find a reliable company If any company comes with this information, it can recreate the Eastern Hyperring."

Xiao Yi's eyes lit up. He came here today for another purpose, which was to get this detailed structural information about the Eastern Super Ring.

With this information, he can activate the [Perfect Engineering] ability to study the tokamak device more carefully.

Without any nonsense, he quickly stepped forward, took down the first document, and took out stacks of information from it.

These materials describe in detail the structural design of each part of the Oriental Super Ring, as well as various engineering drawings, etc., down to a screw.

It is indeed as if Zhao Zhan lobbied for a construction company to build an Eastern Super Ring based on this.

"Thank you."

Xiao Yi said.

Zhao Zhanyou waved his hand: "You're welcome, even though I said that, this thing was still of some value back then, but now after so many years, these design drawings are nothing. Even if they are made public, they probably won't be Is there any research institute that would actually build it like this?”

"You can just take it back to the Science Island Laboratory to read it. After you finish reading it, just bring it back. Anyway, just don't lose it."

Xiao Yi nodded, but his eyes were still fixed on the contents of the information.

In Zhao Zhanyou's view, this thing has no value, but in his view, it is of infinite value.

"Then I won't bother you here. I will take this information back now and study it carefully." Xiao Yi said, "I will come back when the day of official ignition comes."

"Okay." Zhao Zhanyou nodded.

…

Soon, Xiao Yi packed up the information and took it away.

Looking at the car gradually going away, at the entrance of the plasma institute, Zhao Zhanyou said with some confusion: "Speaking of which, why does Xiao Yi want that information?"

Li Jiangan said with a smile: "Maybe he will develop a new tokamak device later?"

Zhao Zhanyou shook his head: "The current structure of the tokamak has basically been finalized. Even if it is optimized, it will not be optimized much, right?"

"Who knows?" Li Jiangan spread his hands and said, "You can never imagine how much structure can be changed. It's like from a topological point of view, people are also donuts."

Zhao Zhanyou pinched his head, shook his head and said: "Forget it, I'd better not think about this thing. I didn't even learn geometry very well back then, let alone topology."

Li Jiangan smiled, then turned around and walked into the research institute again.

"Okay, if you don't want to think about it, then don't think about it. Go back. You still have to prepare for the ignition when the time comes."