Xueba starts with change

Chapter 213 Particle Accelerator Experiment
Not long after, Dean Yang brought Chen Zhou and Yang Yiyi to the destination.

Yenching National Laboratory for Molecular Sciences.

Dean Yang is also the deputy director of the Nuclear Physics and Nuclear Technology Laboratory here.

When he got here, Chen Zhou realized that this subject was so big that even the National Laboratory was involved.

In the laboratory, a group of white coats hurriedly walked, very busy.

Because Dean Yang helped Chen Zhou and Yang Yiyi to report in advance, and the relevant review procedures were basically completed.

Therefore, the two of them received the items needed for laboratory work without wasting much time at the laboratory's management staff.

Afterwards, Dean Yang led the two of them to the core area of ​​the laboratory.

The people here are also core team members of the Nuclear Physics and Nuclear Technology Laboratory.

"This is Lin Xiaoen, your senior, Ph.D. from the Physics Department of Yanda University. This is Ma Zihao, your senior, Ph.D. from the Shuimu Department of Physics. This is Peng Jia, your senior sister..."

Dean Yang introduced them one by one.

Chen Zhou and Yang Yiyi naturally greeted each other.

Lin Xiaoen and the others also said enthusiastically: "I have heard Director Yang said that he wants two newcomers to come, but we have waited so long for them to come, so let us wait so long."

Peng Jia also said: "That's right, when Dean Yang said this, it seemed like you just had a summer vacation."

Chen Zhou replied with a smile: "We have just finished our military training, so President Yang has brought us here."

Lin Xiaoen looked at Chen Zhou and Yang Yiyi, and said with a smile: "I just said how you two are like those who came back from Africa, you are so tanned..."

"Hey, Dalin, watch your words, there is a girl here!" Peng Jia glared at Lin Xiaoen.

"It's okay, senior sister. Senior Lin is right. The sun in this military training was so strong that it never rained." Yang Yiyi smiled slightly, expressing that she didn't mind.

"Look, senior sister, junior sister has said so..." Lin Xiaoen said.

Dean Yang glanced at a few people, and interrupted: "Okay, let's stop gossip, how is the preparation for the experiment going?"

Hearing Dean Yang's words, Lin Xiaoen and the others immediately put away their joking expressions.

Lin Xiaoen and Ma Zihao looked at each other, and Ma Zihao said, "Director Yang, the preparations for the experiment have been completed, and the experiment is scheduled to start at 10 am."

Dean Yang glanced at his watch, and there was still half an hour before ten o'clock: "Okay. You guys check the experimental device again to ensure that the experiment can go smoothly. Also, Peng Jia, you take Chen Zhou and Yang Yiyi to familiarize yourself with it. experiment process."

"Okay, Director Yang (Dean)." Everyone responded in unison.

Afterwards, Lin Xiaoen and the others followed Dean Yang's request and went to check one side of the experimental device again.

Chen Zhou and Yang Yiyi followed behind Peng Jia, wandering around the laboratory, familiarizing themselves with the experimental procedures of the particle accelerator.

"You all know the principle of the experiment, right?" Peng Jia asked the two of them before the accelerator.

Both Chen Zhou and Yang Yiyi nodded.

Peng Jia glanced at the two of them and said softly, "Tell me."

Chen Zhou and Yang Yiyi looked at each other, is this a test for us?

Chen Zhou blinked at Yang Yiyi, Yang Yiyi understood, and said aloud: "The general principle of generating a high-power particle beam is that the Marx generator resonantly charges the pulse forming line, and then discharges the diode through the transmission line. The pulse energy is converted into a particle beam."

Hearing Yang Yiyi's words, Peng Jia nodded, then looked at Chen Zhou, as if waiting for his addition.

Chen Zhou smiled slightly in his heart, thinking that this senior is also interesting, and actually tested the two of them with such a simple principle.

But the principle is really simple, Yang Yiyi has already said it, what should he say?

Chen Zhou thought for a while, met Peng Jia's gaze, and said, "The working polarity of the diode depends on the electron beam or ion beam. When high voltage is applied to the diode, the surface of the cold cathode protrudes microscopically, forming a 'whisker'. With field emission due to field enhancement, whisker explosions occur due to Joule heating, forming a plasma sheath near the cathode."

"Electrons are emitted from the plasma sheath, and the plasma sheath will move to the anode at a speed of 3-5cm/μs. The electron flow is limited by the space charge in the cathode-anode gap. When a strong ion beam is generated, it must be Suppresses the flow of electrons in the diode."

"The physics of diodes involves solving Maxwell's equations and electron motion equations under complex boundary conditions..."

"Okay, let's take a look at the composition of this accelerator." Peng Jia interrupted Chen Zhou at the right time, and she just wanted to see the preparations of the two on a whim.

It's not that I don't believe Dean Yang's vision, but that the simplest principle is often not understood by many people.

"The experimental device, that is, the particle accelerator, corresponds to the principle that Yiyi Xuemei just mentioned. It is mainly composed of magnetic pulse generators, double shaping lines, pulse autotransformers, magnetic insulation diodes or electronic diodes."

While talking, Peng Jia pointed to the big guy in front of her and introduced them to Chen Zhou one by one.

Hearing Peng Jia's words, Yang Yiyi asked aloud: "Senior sister, is this accelerator still using the traditional method of generating high-current pulsed particle beams?"

Hearing this, Peng Jia nodded lightly: "That's right, after storing the electrostatic energy, it will be released in a very short time, and the particle beam focusing technology will be used to generate a particle beam with high energy density."

After a pause, Peng Jia said with a smile: "I think you can see that, although Director Yang sent you a lot of project materials, in fact, there are very few contents related to the experimental equipment. If you have any questions, Just ask me now."

As Peng Jia said, most of the subject materials that Dean Yang sent to Chen Zhou and Chen Zhou were theoretical, and there was almost no content about the experimental equipment.

Otherwise, Yang Yiyi would not even know that the accelerator used in the experiment uses the traditional method of generating high-current pulsed particle beams.

Now that senior sister Peng Jia has said everything, Chen Zhou will naturally not miss the opportunity to ask questions: "Sister, I just heard you say magnetic insulation diodes or electronic diodes, so which one are we using in this experiment?"

Peng Jia glanced at Chen Zhou, paused for about 3 seconds, and then slowly said: "The theory and numerical simulation of strong pinch focusing diodes have always been a hot topic in the research of high-current pulsed particle beam technology in the world. It’s unavoidable. I won’t tell you more about the specifics, but you will know later.”

After finishing speaking, Peng Jia continued to introduce other auxiliary devices in the experiment to Chen Zhou and the others.

These things must be clearly understood and mastered by every experimenter.

At this time, Yang Yiyi whispered in Chen Zhou's ear: "You asked too urgently."

Chen Zhou was taken aback for a moment, and instantly understood.

It seems that he asked the key point of the experiment.

(End of this chapter)