Compared with tokamak devices, the biggest advantage of stellarumers is the magnetic field confinement ability of the plasma.

By rotating around the ring to stretch the polar cross-section of the flux surface and making the magnetic axis non-planar, the magnetic confinement capacity of the stellarator is more than an order of magnitude higher than that of the tokamak.

But correspondingly, the manufacturing difficulty of the stellarator is more than one notch higher than that of the tokamak device.

All the constraints of the stellar simulator on the plasma turbulence come from the external field coil, which increases the constraint force but also increases the engineering difficulty.

To put it simply, it is to reduce and solve the problems of collision and magnetic surface tearing of plasma turbulence by increasing the engineering difficulty.

This grafting method is indeed one of the feasible means for controlled nuclear fusion technology, but now it has caused new problems for Xu Chuan.

In the office, Wang Jianzhang, vice president of Western Superconductor, is sitting on the sofa, glancing at the door from time to time.

After discovering the production of the outfield coil of the stellarator, they were thinking of a way as soon as they found it, but it was really difficult to think of a way due to various factors such as production level, material, and time.

After determining that Western Superconductor was not capable of solving this problem, he, as the person in charge of the docking project, rushed over to report as soon as possible.

Although from the perspective of the contract, Xinghai Research Institute and Western Superconductor Group Company are just the relationship between Party A and Party B, but the order of Xinghai Research Institute, miniaturized and controllable nuclear fusion technology involves too much impact.

"I don't know what to do this time."

In his mind, Wang Jianzhang thought about the follow-up impact, if it was because of them, the research of miniaturized and controllable nuclear fusion technology would be delayed, and it would be difficult for the Western Superconductor Group to bear this impact.

Just then, the door to the office was pushed open.

The assistant who received him at the beginning walked in, Wang Jianzhang quickly stood up, ready to say hello, but the figure who walked in immediately after him stunned him.

"Mr. Wang, I heard that there is a problem in the production of outfield coils? Tell me about the situation. Looking at Wang Jianzhang who was standing there, Xu Chuan said hello and asked.

Hearing the inquiry, Wang Jianzhang suddenly came back to his senses, couldn't help swallowing his saliva, and his nervous heart trembled a little.

This person actually came here in person?

Then this time, the matter may be really serious.

The thoughts in his mind turned in an instant, but he quickly came back to his senses, took a deep breath, and explained, "That's the case, Academician Xu. ”

"Regarding the batch of stellarite exomagnet coils and magnet windings purchased by Xinghai Research Institute in our Western Superconducting Group, due to immature materials and technology in production, there is a big gap between the good and defective products of the production line, and more than 30% of the finished products cannot meet the standard requirements after preliminary testing."

"I've already brought the relevant data here, you can take a look."

While speaking, Wang Jianzhang quickly took out a document bag from the bag he carried with him and handed it over.

Xu Chuan nodded, reached out and took the information apart, flipped through it, and while looking at it, he asked, "Isn't there a way to solve it?" ”

Wang Jianzhang said with a wry smile: "After discovering this problem, we immediately convened the technical staff and experts and professors in the factory to discuss. ”

"Although we are already working on the establishment of a second advanced production line, this is also far from quenching our thirst, so we can only make a report with you and the research institute first, to see if we can think of a way together, and hope that Academician Xu Haihan."

Xu Chuan flipped through the documents in his hand, but he didn't blame the Western Superconductor Group for his thoughts.

After all, this is the first time for the production and manufacture of improved superconducting materials.

On this basis, it is necessary to complete the production of the stellar simulator outfield coil, and the difficulty has increased by more than an order of magnitude.

Moreover, engineering problems are the focus of the stellar simulator production process.

Flipping through the documents in his hand, Xu Chuan thought about it, the production problem of the stellarizer lies in the extremely complex three-dimensional structure and the three-dimensional twisted coil that requires extremely high precision, and it is the latter produced by the Western Superconductor Group.

Judging from the document report, there are two main reasons why more than 30% of the finished products fail to meet the standard requirements.

The first point is that the structure of the three-dimensional twisted coil is too complex, the manufacturing is difficult, and the precision of the equipment is not enough during processing, which leads to problems such as radian deviation and insufficient accuracy index after the parts are prepared.

This problem is serious and serious, and it is not serious if it is not serious.

The solution is not impossible, and Western Superconductor also attached a solution to the document, that is, to re-optimize the design and transformation of the original production line, or add a new production line.

But either way it takes a long time to adjust.

The second question has a comparatively greater impact than the first.

The material used for the outer field coil of the stellarator is an improved superconductor, which itself is doped into the hole by the Cu atoms in the excess Cu nanoparticles on the high-temperature copper-carbon-silver composite superconducting material, and the magnetic trap generated by the magnetic trap is enhanced.

In the structure of the two-dimensional plane, both the Xinghai Research Institute and the Western Superconductor Group can improve the topology of the superconductor surface through a series of means.

However, when placed on the outfield coil of the stellarator, the original two-dimensional planar coil structure becomes a twisted three-dimensional coil, and the surface is connected with various convex and concave uneven layers.

The change in shape is simply like a doughnut that used to be regular, but now it has become a twist sprinkled with sesame seeds and crushed peanuts.

There is no doubt that superficial topological hole enhancement of the latter is more than an order of magnitude more difficult than the former.

And this problem cannot be solved by adding or optimizing production lines.

Unless the Western Superconductor Group finds a way to industrialize the production of improved superconductors and solves this problem. Otherwise, with the current means, no matter how to optimize the production line, this problem will still exist.

Of course, it is certainly effective to increase the production line and expand the production scale, but judging from the data on the file, Xu Chuan can be sure that this defect will be more magnified in the subsequent miniaturized parts.

Now the elongated Huaxing stellarite coil, because of the relationship of volume, can also be enhanced by some means when carrying out topological acupuncture point doping, but the smaller the volume, the weaker the effect of the enhanced means.

If the volume of the outfield coil is further reduced, I am afraid that the number of qualified products will be further reduced.

Although this problem can also be solved by increasing the production line, when the defective rate is too large, the price to pay is a bit too great.

After thinking for a while, Xu Chuan put the document in his hand on the desk, raised his head and said, "I already understand the problem, it is indeed a difficult problem. ”

Looking at Wang Jianzhang, who was nervously standing opposite, he smiled and comforted: "Don't worry, I don't blame you, this kind of problem does not mean that you will be able to control it, the urgent thing now is to find a way to solve these problems." ”

Hearing this, Wang Jianzhang quietly breathed a sigh of relief, don't look at the age of the person in front of him is only one or two years older than his son, but standing in front of him, the pressure is really great.

Nodding, he quickly replied: "What Academician Xu said is that this problem is just beyond the R&D capabilities of the Western Superconductor Group, and we may not be able to think of any good way in a short period of time except for the plan of increasing the production line." ”

Xu Chuan thought for a moment and said, "In this way, you will send me a copy of the detailed production materials and technical data, and I will take a look at it first." ”

"No problem, I'll prepare the materials when I go back, it's just" After a pause, Wang Jianzhang glanced at Xu Chuan cautiously, and then said: "Won't this be too troublesome for you, Academician Xu, after all, your time is so precious." ”

Xu Chuan waved his hand and said, "Just send the information over, I will communicate with the Chuanhai Research Institute when I go back, and then arrange for two people to go to your factory to cooperate and study together, and solve the problem first." ”

The production of the stellarator outfield coil has encountered a problem, even if this problem is not strictly attributed to Xu Chuan, but he still has to find a way to solve it.

Superconducting coils made of improved superconductor materials are the key core of miniaturized and controllable nuclear fusion technology.

For this problem, Xu Chuan can't let time drag on like this, and besides him, the difficulty of others trying to solve this problem can only be said to be greater.

After all, the improved superconductor material was developed by him himself, and no one knows the properties of this material better than him.

After getting the relevant production materials and data from the Western Superconductor Group, Xu Chuan thought about the solution to the problem.

In order to seek inspiration for solving problems, he collected a large number of papers related to materials, superconducting materials, doping technology, topological space and other fields, and tried to get inspiration from some published research materials.

But after two days in a row, he still didn't make any progress on how to improve the materials or production methods.

After flipping through a paper in the field of materials, Xu Chuan leaned back on the back of his office chair, stared at the ceiling and shook his head, breathing a long sigh of relief.

To be honest, no one can answer this question, and there is not even any previous research to refer to.

Improved superconducting materials have only been around for a long time, and the outside world can't even find relevant papers.

And the papers that provide a theoretical basis for improved superconductors, let alone the frontier fields that not many people have studied, have not sent out any papers.

In this case, it can only be said that there is little hope of finding ideas for reference from those published papers.

"Professor, you have a big class on math and physics this afternoon, and this is your schedule and time."

In the office, a voice interrupted Xu Chuan's thoughts, and when he turned his head, he saw that assistant Tang Ran was putting a class schedule on the table.

Xu Chuan breathed a long sigh of relief, nodded, and asked, "What time is the afternoon?" ”

Mathematical Physics was a course he opened in the second half of last year, and after the Department of Mathematics at NTU was expanded into a college, he agreed to President Tan Shaoyuan's request to open a course on mathematics and physics, mainly about how to apply mathematics to other physics.

Of course, sometimes he also mixes in some other methods, such as how to use mathematics to calculate data in the process of materials, chemistry, biology and other experiments.

As a result, the class was so popular that not only students from the Department of Mathematics would listen to it, but also students from other faculties would occasionally come to sit in on it.

"At three o'clock, in the No. 1 lecture hall in the No. 3 teaching building, do you need me to help you prepare any materials and teaching materials?" Tang Ran quickly replied.

"No, there's nothing to prepare." As he spoke, Xu Chuan stood up from the office chair, moved his body and said, "I'll go out for a walk, just call me if there's something." ”

"Hmm."

Tang Ran nodded in response, and looked at Xu Chuan's departing back, she shook her head slightly.

Xu Chuan's performance in the past two days when she was studying problems in the office, she saw the whole process, what problems might she have encountered? Anyway, he wasn't in a very good mood in the past two days, and he didn't really want to deal with people.

It's just that she can't help it.

After all, what this professor is studying is not something she helps at all, let alone helping, she probably won't even be able to understand the question.

For her, the only thing she can do is to pray in her heart, hoping that the professor will find a solution as soon as possible.