Chapter 1393 Others are just pretending, do you really want to solve the problem?

A silence.

Let’s not talk about support or opposition for now.

Except for Fang Jianming and Huang Zhitao who were well prepared, even the Chinese delegation was a little slow to react for a while.

Originally, the content they prepared was relatively routine, simply a partial test report on the "Eastern Super Ring", which was regarded as a response to the task assigned by ITEA.

So when Peng Juexian came on stage just now, they were still worried that compared to Robert Hull's groundbreaking speech, such mediocre content might be too unattractive, thus causing setbacks for them in subsequent negotiations.

Now, they don't have to worry about that anymore.

Instead, almost no one knows what will follow.

Jin Jimin, who had just met Peng Juexian the day before, was even more shocked. His eyes were full of bewilderment and shock, as if asking, "Why didn't you notify us in advance when you were doing such a big thing?"

In fact, it was not the former's intention to conceal the truth, otherwise it would at least not have kept it secret from members of its own delegation.

In fact, until early this morning, this matter had not yet been settled.

After receiving Chang Haonan's theoretical explanation, Peng Juexian, although he had some understanding of its content before, still spent several hours to understand it himself. In addition, he had to revise the lecture notes at the last minute, which made him very nervous.

Rather than informing everyone at the last minute after entering the venue, it is better to give them a real surprise.

Anyway, the other members don’t need to do anything today.

In short, several Chinese representatives couldn't help but open their mouths.

But in such a formal occasion, it is impossible to question myself, so I have to hold it in.

The first to react should be the on-site conference staff, who quickly switched the projector to the signal channel of the Chinese delegation.

The French words "Thanks for listening" on the curtain suddenly turned into a line of bold English titles.

"Model explanation and theoretical control scheme of sawtooth oscillation and plasma collapse phenomena."

It was only then that the first representative responded:

"Does the Chinese side think that the goals set by Academician Hull are unattainable?"

Logically speaking, we haven't entered the QA phase yet, so no one should be asking questions.

But in this situation, obviously no one cares about these details.

Including Peng Juexian himself.

“That’s not the case… I think Professor Hull’s goal is achievable, but it does not have engineering value.”

As he spoke, he switched the PPT to the first page which actually had content.

"Please take a look at this plasma waveform diagram from the TEXT-U medium-scale tokamak device at the University of Texas at Austin."

The reason for choosing a medium-sized tokamak device is that China had purchased TEXT-U in 2007 and subsequently rebuilt it into J-TEXT, thus obtaining all first-hand information.

However, because it has not yet been officially put into use, these experimental data are still made public by the United States in the early years, which can avoid many unnecessary doubts.

After a brief pause of a few seconds, Peng Juexian continued:

“Although the scale is relatively small, you can compare it with the data given by Academician Hull just now.”

Hundreds of eyes at the scene were immediately directed towards the French delegation.

Robert Hull, who suddenly became the focus, had a bad feeling, but now that he had been put on the spotlight, he could not refuse. He nodded and signaled the secretary next to him to bring up the waveform chart on his PPT.

Soon, the two waveforms overlapped.

Like two crossed blades piercing the old theory.

"Note the frequency ratio of the toroidal field to the poloidal field."

Peng Juexian enlarged the coordinate axis, and the vertical axis that was originally compressed by the French instantly filled the screen:

"When the ratio between the two approaches 1.618..."

"Golden ratio?"

The Italian representative's mumbling almost came out of his mouth, and it was transmitted through the microphone to the ears of almost everyone at the scene, immediately causing a surprised whisper.

Peng Juexian also knew that the other party did not mean to interrupt, so he suppressed his smile and waved his hand:

"No, the 618 after the decimal point is just a coincidence. There are actually more digits..."

He explained:

"In fact, this is the critical point of spiral resonance."

Peng Juexian's laser spot circles a differential equation:

"In his speech just now, Academician Hull mentioned that it was magnetic reconnection that caused the energy to escape, but in fact it was a chain reaction caused by resonance - just like the timing of pushing a swing may affect the amplitude and frequency of the swing, but in the final analysis, the wrong timing will hinder the swing..."

"..."

As he introduced himself, the sounds of flipping papers and typing keyboards gradually rang out in the audience.

The theoretical introduction was unexpectedly short this time. After only twenty minutes, it was almost over:

"Therefore, based on the sawtooth collapse criterion we obtained, it can be concluded that there are two main ways to control sawtooth instability."

Peng Juexian stopped here and took a deep breath.

He didn't do this specifically to give others time to understand, but he was indeed feeling a little dizzy due to fatigue and excitement.

After recovering a little, he finally said the most important conclusion:

"One is to control the period of the sawtooth oscillation by adjusting the magnetic shear of the q=1 surface, and the other is to control the amplitude of the sawtooth oscillation by changing the perturbation potential energy term of the magnetohydrodynamic instability."

As soon as these words were spoken, there was another round of whispering below.

"I know what you are thinking right now. This conclusion seems to be similar to what Academician Hull just reported, right?"

No one responded, but judging by the expressions of the audience in the first few rows, his guess was not wrong.

"Here, please note that whether it is low-hybrid wave heating or neutral beam injection, it can only simply extend the period of sawtooth oscillation, while the disturbance amplitude will still gradually increase over time and lead to a concomitant increase in parameters such as temperature and density."

Peng Juexian's speech speed is getting faster and faster:

"In other words, it can only delay but not truly solve the sawtooth collapse phenomenon. Not only can it not solve the problem, but it will also affect the normal discharge of impurities in the plasma core. It is a method that only treats the symptoms but not the root cause. Even if the controllable time of the plasma can be increased to 600 seconds, 6000 seconds or even longer, once it is separated from the high energy input, the core will instantly rupture, and the steady-state existence of the plasma cannot be truly achieved."

It was not until then that everyone finally understood why he had just commented that Hull's plan "had no engineering value."

At this stage, no matter whose tokamak device it is, it requires ultra-high-power energy input to maintain the existence of plasma. If converted, the energy consumed will even be greater than the output energy of future fusion power generation.

Of course, with the current level of human fusion research, we can only focus on the maintenance time of plasma, which is far from considering the energy profit and loss.

But no matter what, the ultimate goal of controlled nuclear fusion is still to provide endless energy.

Hull's approach will only make ITER further away from this ultimate goal...

At this point, Peng Juexian no longer kept the secret:

"Therefore, our solution is to improve the topological structure of the magnetic field by adding an external spiral field, so that the disturbance amplitude of the sawtooth oscillation can be strictly maintained stable, ensuring its ability to expel impurities while completely eliminating the hidden danger of plasma core collapse in principle!"

At this moment, the atmosphere in the venue became subtle.

Everyone who is working on controlled nuclear fusion, especially joining ITER, is just doing their job as they go along.

No matter what method is used, as long as we can make some progress, it will be considered a victory.

Why do you, China, suddenly act like you really want to solve the problem?