I failed a course, and the system became my study supervisor.

Chapter 73: Practice by Making a Helmholtz Coil (First Order Request)
It is the first weekend after the start of the new semester, and Xu Ling came to Zhang Zhongyao's laboratory.

This laboratory was in the old campus next door. Xu Ling asked around and went through many twists and turns before he found it.

It is an old-looking experimental building with ivy covering the side walls.

Scientific research projects worth hundreds of millions of dollars are being carried out here?
Xu Ling's eyes were full of disbelief.

The futuristic filter of the laboratory in my mind was shattered.

"Xu Ling, you're here."

At this time, Wang Xueqin walked out of the laboratory building.

"Hello, Teacher Wang."

Xu Ling nodded and greeted.

"Now that you've entered the lab, you're my junior. Call me Senior Sister."

Wang Xueqin smiled and spoke softly.

Senior sister?

Xu Ling still felt a little awkward, but he didn't want to spoil Wang Xueqin's interest. He quickly changed the topic and greeted "Senior Sister".

"Haha, are you a little disappointed on your first visit today?"

Wang Xueqin asked in a joking tone.

“It’s really quite different from what I imagined.”

Xu Ling told the truth.

Wang Xueqin wasn't surprised and said slowly, "Things that appear ordinary can also harbor extraordinary mysteries. Not only does this contain the world's second-strongest constant magnetic field generator, but it also contains the world's most advanced particle accelerator."

This is what Zhang Zhongyao said when Wang Xueqin entered the laboratory last year, and now she said it again exactly as it was.

"Senior Sister, can you take me there now?"

When Xu Ling heard about the particle accelerator, he became impatient.

Without keeping Xu Ling in suspense any longer, Wang Xueqin led Xu Ling into the laboratory building.

Immediately afterwards, Wang Xueqin walked straight to the elevator at the end of the corridor.

Is the accelerator underground?

Xu Ling guessed.

The result was just as Xu Ling expected. Wang Xueqin pressed the -6th floor button.

As the elevator continued to sink, Xu Ling became more and more excited.

"Ding--"

The elevator door opened and Xu Ling followed Wang Xueqin's steps out.

Although we were underground, the scene before us did not feel depressing at all.

The entire space is bright and spacious, with various instruments full of a sense of technology, and many people coming and going.

"Don't be surprised, just follow me first."

Wang Xueqin looked at Xu Ling's astonished expression and said playfully.

Afterwards, Wang Xueqin took Xu Ling and turned left and right to a relatively spacious room where a strange-looking instrument was placed.

The instrument itself was a cylindrical container, but the metal exterior prevented visibility. Next to the container was a console, its various buttons confusing Xu Ling.

"Senior sister, what is this?"

Xu Ling asked doubtfully.

"Ion source, which produces an ion beam by ionization for subsequent acceleration."

Wang Xueqin explained.

Xu Ling suddenly realized something, walked around the ion source, and found a pipe leading deeper underground.

Before Xu Ling could ask any questions, Wang Xueqin started to explain.

This is a pipeline for transporting particles, which can first provide the particles with a certain initial velocity so that the particles can reach the deep acceleration pipeline.

The deep acceleration pipeline is a huge circular pipeline with a total length of about 10 kilometers, buried dozens of meters underground.

After the entire process, the maximum speed of the particle can reach 0.9998 the speed of light, and the maximum energy can reach 4500 billion ev.

After acceleration, the particles continue downward into a larger circular pipe with a total length of about 27 km.

Here, particles can collide, and experimenters can analyze the collision results through monitoring equipment. What does 0.9998 the speed of light mean? Xu Ling couldn't imagine it.

What shocked Xu Ling even more was that such a large device was right under his feet every day, and he only found out about it now.

Just as Xu Ling was shocked, Zhang Zhongyao entered the room with several students.

"How do you feel, Xu Ling?"

Zhang Zhongyao asked with a smile.

"It's shocking!"

Xu Ling's tone was excited and he had not yet recovered from the shock.

"It's not a loss to let you enter my laboratory, right?"

Zhang Zhongyao said jokingly.

Xu Ling quickly waved his hands and said, "Not only did I not lose money, I think I made a lot of money!"

"So what can I do now?"

Xu Ling asked immediately.

"Haha, don't worry. Let your senior sister take you to see the steady and strong magnetic field first." Zhang Zhongyao's tone was very satisfied. "Then make a Helmholtz coil to practice."

Helmholtz coils?
That's really just practice.

While thinking, Xu Ling and Wang Xueqin came to the location of the strong magnetic field generator.

I saw a huge cylindrical device standing in the center of the hall, with several thicker pipes connected around the cylinder.

At the same time, there is a small display screen above the entire device, showing a number - 42.02.

“This is 42.02 Tesla!”

Wang Xueqin said with some pride.

42.02 Tesla!
Xu Ling's cognition was shocked again.

You should know that the average magnetic induction intensity of the Earth's magnetic field is only 0.5 gauss.

1 Tesla is equal to 10000 Gauss.

More importantly, the entire device was completely independently developed by China. No wonder Wang Xueqin looked so proud when introducing it.

Such a strong and stable magnetic field is naturally extremely important for scientific research.

The properties of strong magnetic fields can be used to conduct in-depth research in many fields, such as the highly anticipated nuclear fusion research.

A stronger magnetic field can better confine the plasma and improve its stability and confinement performance.

Of course, controlled nuclear fusion is still under exploration.

After visiting the two important devices in the laboratory building, Xu Ling did not forget a practice task assigned to him by Zhang Zhongyao.

Zhang Zhongyao had only one requirement, which was that the magnetic induction intensity of the Helmholtz coil must be 300 gauss.

So what is a Helmholtz coil?

It is a method of using two identical coils to make the magnetic field between them approximately uniform by controlling the radius of the coils and the distance between them.

The principle is very simple, it is the superposition of magnetic fields.

This is also why Zhang Zhongyao called it practice.

Xu Ling naturally would not be careless about Zhang Zhongyao's arrangements.

"Then you can do it here. Be careful when the electricity is on."

Wang Xueqin brought Xu Ling to a small laboratory, which had all the equipment Xu Ling needed.

The target is 300 gauss, which has been determined. The parameters that can be adjusted are the coil radius, the distance between the two coils, the number of coil turns, and the current intensity.

According to the principle, the magnetic induction intensity inside is uniform only when the distance between the coils and the coil radius are the same. Then one parameter is immediately reduced.

The next idea was very simple. Xu Ling planned to determine the radius of the coil and then calculate the relationship between the current intensity and the number of turns.

Now that you have an idea, will there be any difficulties in making it?

It took Xu Ling just over an hour to complete the production and calibration.

Xu Ling was very meticulous in the calibration step, because he always had a feeling that Zhang Zhongyao's arrangement might have ulterior motives.

Zhang Zhongyao may have wanted to use the coil Xu Ling made to see Xu Ling's attitude towards scientific research experiments.

(End of this chapter)