Section 219
And it’s not just about nuclear fusion. Although their Institute of Plasma mainly studies controllable nuclear fusion, they also study other plasma-related issues.
Among these other issues, research related to superconductors is more or less involved.
Using superconductors with superior properties such as HTSC-1 can also help them develop some results that can be published in top publications.
The reason why other research institutes and laboratories want to win the share of HTSC-1 is basically for this reason.
Anyway, being able to produce results and publish papers is the biggest good thing for scientific researchers.
Then, Xiao Yi continued: "In addition, in addition to this matter, if you have any theoretical issues that need help, I can also try to research them. If it is solved, for your research, It should also bring a lot of help.”
Hearing his words, Li Jiangan and the others couldn't help but look at each other for a moment.
Xiao Yi's words were really full of confidence.
Xiao Yi thinks he can solve the problems they haven't solved?
At this time, Zhao Zhanyou said: "I just have a question here. From a theoretical perspective, can the Greenwald limit no longer be improved?"
"Greenwald limit?"
Xiao Yi thought for a moment and said, "Are you referring to a physical parameter in the tokamak device?"
"Yes." Zhao Zhanyou said: "The Greenwald limit defines the maximum average density of plasma in a tokamak. If this upper limit is exceeded in a tokamak, the plasma will become unstable, thus affecting the performance of the nuclear fusion reaction. Sustainability and efficiency.”
“Originally, the Greenwald limit was considered to be the result of Greenwald’s analysis in 1988. However, in 2022, the Greenwald limit was raised by nearly twice. "
"In other words, in a tokamak, we can add more fuel to run at higher power and produce higher energy with the same level of safety."
"So can this limit continue to be raised?"
Hearing this question, Xiao Yi became interested.
Well, the classic limit problem.
Although when it comes to controllable nuclear fusion, this problem is quite difficult.
"I understand. I will study this issue after I go back. If I have the results, I will tell you."
"Okay." Zhao Zhanyou nodded.
…
Next, Xiao Yi wandered around their place again. As for witnessing the kind of thing that EAST ignited, he could only wait until he had the opportunity to come again.
People can't just build an artificial sun just because he comes to visit.
What's more, once this thing is turned on, subsequent maintenance will be a hassle.
In addition, Xiao Yi also visited their canteen and observed the specifications of their canteen.
Their Science Island Laboratory is in urgent need of a canteen. Otherwise, if you want to eat or something, you have to run outside, which is very inconvenient.
Many people in the laboratory have reported this problem to him.
Xiao Yi's visit ended here after lunch.
…
Back to the Science Island Laboratory.
Xiao Yi turned on the computer in his office, and first checked the density of states of the electron-interface reaction migration model and the calculation progress of the exact solution of the Schrödinger equation, and took a look.
Um……
I guess I can calculate it tonight.
Then he stopped looking and thought about the question Zhao Zhanyou told him.
"Grindelwald's limit...why not call him Grindelwald?"
While complaining in his mind, he began to collect relevant information.
Soon, he found the 2022 paper.
""Tokamak density limit scaling based on edge turbulent transport and its impact on ITER"... uses the first principles method, so the results obtained by the calculation method are also used."
"Hmm...so it turns out to be a more complex optimization problem?"
Xiao Yi thought for a moment.
"Plasma turbulence...the paper uses a simplified drift-simplified Braginskii fluid model to describe the physical processes of the tokamak edge plasma."
"Although the degree of simplification is relatively high, in terms of results, it is still relatively accurate."
"But what if we could use better fluid models to make inferences?"
Xiao Yi shook his head slightly, "I really didn't expect that this result would not be born until 2022. It is probably because there were too few people studying nuclear fusion before."
Just like ITER, the International Thermonuclear Fusion Experimental Reactor Project Organization, began to have proposals in 1985, but it was not until 2001 that the final design was completed, and then it was not until 2007 that construction officially started.
Then he stopped thinking about it and started collecting various information. Since he wanted to solve a problem, he had to start by understanding the problem first.
Just like that, time passed quietly.
…
Three days later, as the relevant calculations of the electron-interface reaction migration model were officially completed, Xiao Yi also integrated these calculation results into the model. At this point, the model used to describe the electron migration behavior in the interface reaction process was finally completely perfected.
"Done."
Looking at the model on the computer, Xiao Yi's mouth curled up.
"The next thing to do is to verify its accuracy."
He immediately called the four people in the research group and held a temporary group meeting.
"These days, our goal is to verify this model."
Standing at the front of the small conference room, Xiao Yi opened the PPT and displayed the electron-interface reaction migration model.
Liu Xiaodong and the other four were confused.
Model?
What model?
What Professor Xiao has been busy with these days is this model?
"I named it the electron-interface reaction migration model, abbreviated as EIRM."
"It mainly uses the reaction-diffusion equation, and by optimizing it, it integrates the Schrödinger equation and the interface state density in order to describe the electron migration behavior during the interface reaction."
"If it can achieve accurate description, it can also help us optimize lithium phosphorus sulfur chlorine to a certain extent."
Hearing Xiao Yi's introduction, the four people suddenly widened their eyes.
What? !
Describe the electron migration behavior? And it is specifically for the process occurring on the interface?
God, their Professor Xiao, this is really not to do anything, but once he does, it's scary.
"Okay, next I will send this model to you first, you can learn about it, ask me if you have any questions, and then start experimental verification."
Afterwards, Xiao Yi sent the model to them.
The four people immediately looked at it with great curiosity.
And the more they looked, the more excited they became.
"Great!"
"It's possible to find the solution to the Schrödinger equation for electrons at the interface. This electron wave function... is too precise!"
"The density of states at the interface is a key factor affecting electron migration. This model also properly accommodates the discretization effect of electron energy levels at the interface."
"And..."
The four people were amazed.
And what they could see was not profound enough. This model involved much deeper things than they imagined.
But no matter what, they came to a conclusion.
That is-it works!
"Professor, we've finished reading it."
"No more questions?"
"No more."
Xiao Yi nodded: "Okay, that's it. Let's go to the laboratory and conduct verification experiments now."
"Yes!"
Just like that, they came to various laboratories and began to verify.
Using advanced technologies such as scanning tunneling microscopes and atomic force microscopes, the migration path of electrons at the interface is directly observed and compared with theoretical models. In addition to the first time, there are various verification methods such as electron migration rate and density of states.
About a few days later.
As all the laboratories are completed.
Looking at the results given in the final report, Liu Xiaodong and his team were stunned.
"The maximum error between the model and the experiment is less than 15%, and the average error is only 5%..."