Chapter 214: Experimental Data (2/3)
At 10 o'clock in the morning, the experiment officially began.
The experiment will be conducted in three steps.
The short-circuit test and open-circuit test of the generator are respectively, and the short-circuit current and open-circuit voltage will be measured.
A dummy load experiment from the generator to the transmission line to the dummy load resistor will measure the voltage on the generator and the dummy load resistor.
The out-beam experiment from the generator to the transmission line to the diode will measure the voltage and current typical of the diode.
The measurement of these data will be carried out by means of a specific parameter measuring device.
The experiments were carried out quickly and the feedback on the data was timely.
With the switch closed, the final step of the beam experiment begins.
The charged magnetic pulse generator begins to discharge the diode through a double forming line, forming a beam of intensely pulsed particles.
At this time, Chen Zhou finally knew that the diode used in this experiment was called an anode rod pinch focusing diode.
At this time, a kind of coaxial diode was developed from the conical anode reflecting target focusing structure used in the early flash X-ray machine.
The structure of the anode pinch focusing diode is to use a thin annular cathode around a small diameter anode rod, and the anode rod gradually tapered and extends beyond the cathode plane by some distance.
In this diode, the electrons emitted from the radial cathode are pinched back by the beam from the magnetic field, focused downstream of the cone, and finally bombarded the anode tip of the heavy metal, resulting in ducient radiation X-rays.
These X-rays are then emitted from the tip of the anode sharpened into a needle-like shape, enabling the formation of point-source X-rays.
The advantages of this diode are that the focal spot formation is small, stable, and simple in structure.
Chen Zhou estimated that this was also the reason why Dean Yang and the others chose the anode rod clamping focusing diode.
If you contact Peng Jia just now, it is estimated that there will be many other diode experiments in the future.
Chen Zhou carefully observed the various measurement data fed back.
His greatest significance in this research group should be to explore the greatest value of these data.
It is through the analysis of the data that the optimization of the experiment can be completed.
How to obtain a strong beam with a small focal point, stable shape and position, and how to obtain an electron beam or ion beam with a large area and good uniformity, all need to be explored from the experimental data.
In particular, the research on strong pinch diodes, how to move towards a high voltage of > 10 MV, a small focus of < 1 mm, a high brightness of 1000 Rs at 1 m, and the direction of multiple pulses and amplitudes are also included in the experimental data.
The experiment was soon over.
After the experimental data was sorted out, Dean Yang announced the end of the experiment and arranged the preparation for the next experiment.
Chen Zhou sighed slightly, this experiment was indeed a bit troublesome.
"Chen Zhou, how many days can the experimental data be processed?" Dean Yang turned his head to look at Chen Zhou at this time and asked out loud.
Chen Zhou hesitated slightly, and then said, "Two days." β
Now he is not in a hurry to start the math project again, so he can arrange his time for this project.
Hearing Chen Zhou's words, Lin Xiaoen and the others looked at each other, and they all felt that this kid hadn't processed the experimental data, and it had been two days?
Originally, they objected to Dean Yang handing over the task of processing data to an undergraduate, but Dean Yang gave Chen Zhou a package ticket.
They wouldn't have said anything more.
It's just that Chen Zhou will boast about Haikou, which makes them a little uneasy.
However, Dean Yang said, "Okay, you will send the data results to me and Peng Jia respectively in two days." β
Chen Zhou nodded.
Dean Yang arranged Yang Yiyi in the laboratory again and followed Peng Jia.
Unlike Chen Zhou, Yang Yiyi is a pure physics student, and Dean Yang has higher expectations for her.
After a brief arrangement of the work of the laboratory, Dean Yang took Chen Zhou and left the laboratory.
After Chen Zhou left, Lin Xiaoen finally said, "Senior sister, do you think this kid is reliable?"
Peng Jia naturally knew that Lin Xiaoen was talking about Chen Zhou, she glanced at Lin Xiaoen and said, "Don't think about it. He is a student of the Department of Mathematics, and Dean Yang values him so much, there must be something special about him. β
Lin Xiaoen still said: "However, this is an experiment that we have worked hard to prepare for for such a long time, if it is delayed......"
"No, it won't. Yang Yiyi interrupted Lin Xiaoen's words and said slowly, "If it's just data processing, I don't think any of us can compare to him." He's not just a math student. β
Lin Xiaoen looked at Yang Yiyi suspiciously: "Do you know him well?"
Peng Jia also looked at Yang Yiyi with interest.
Yang Yiyi smiled softly: "I know a lot, he just recently solved the problem of hail conjecture." β
"What?hail conjecture?!" Lin Xiaoen and Peng Jia blurted out at the same time.
Just because they've been in the lab for a long time doesn't mean they don't know what the hail conjecture is.
"How is this possible? Isn't he just a sophomore?" Lin Xiaoen suspected that he had heard it wrong.
At this time, the researchers in the laboratory basically noticed the movement here.
The news that this little girl said was too shocking.
Yang Yiyi said lightly: "Does the sophomore have anything to do with solving the hail conjecture?"
"Uh......" Lin Xiaoen was speechless.
But after work today, he will definitely check the news in this regard.
If it is true, then Chen Zhou has no opinion at all when it comes to processing data.
Just kidding, people who are professional in mathematics can't process some experimental data?
Chen Zhou, who was already on the way back to Yanda, didn't know what was happening in the laboratory.
Even if he knew, he probably wouldn't have explained.
When the experimental data is processed and the results are available, the doubts will naturally disappear.
Actually, Yang Yiyi didn't plan to talk much, but this senior Lin Xiaoen, who looked enthusiastic, was muttering her happiness behind her back, so how can she do it?
After returning to Yan University, Chen Zhou simply solved lunch, returned to the dormitory, and came to the library with his computer.
said it was two days, but in fact, according to his own actual estimates, it was about one and a half days.
"The development of the current in the anode pinch focusing diode makes me think about it...... Hmmm......"
[At low voltage, electrons move radially, which belongs to the space charge confined flow. At higher voltages, weak pinch begins, and electrons begin to approach the anode, grazing along the surface. γ
[At higher voltages, strong pinch occurs, forming a self-magnetic insulated flow, and with the help of ions generated by the anode, electrons flow to the tip of the anode rod.] In the magnetically confined region, electron flow isotopes are formed, with most of the current reaching the tip of the anode rod. γ
After writing this process on the scratch paper, Chen Zhou read it again, habitually clicked on the scratch paper a few times, and continued to write:
[In a non-cylindrical geometric mechanism, under the non-relativistic space charge limitation, it can be inferred from the space charge confinement flow formula given by Langmuir and Blodgett formulas that when the diode current is constant Rc/Ra, the current I is inversely proportional to Ra and proportional to l......]
[That is, the critical current Ic=Ξ±Β·8.5Β· (Ξ³0?? -1)^(1/2)/ln(Rc/Ra), which is independent of the length and only depends on the ratio of the radius of the cathode to the radius of the anode rod Rc/Ra......]
γ...... When there are ions, the Ξ± increases, from Ξ±=1.6 at Rc/Raβ1~2 to Ξ±=3 at Rc/Ra=16, Ξ³0 is the relativistic factor, and Ξ³0=1+eV0/mec??γ γ
[Therefore, the dose produced at a distance of 1 m from the diode can be measured with D(t)=7Γ10^(-4)I(t)V(t)^1.^(-1).] γ
According to the current development process in the anode rod pinch focusing diode, Chen Zhou first sorted out the formulas that need to be used.
For him, that's the comfortable way to handle data.