Chapter 178: Successive accidents

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At 7:30 on Saturday night, Xu Qiu, Han Jiaying and Chen Wanqing gathered at Caiyi 216 on time.
Xu Qiu paid special attention to the school girl and found that she had returned to her usual lively and bounce appearance.
She will most likely be fine.
However, the elder sister is nearby, so it is not good to ask directly, so let's consider the next light source experiment.
So Xu Qiu went into the glove box and put the prepared samples, gloves, tweezers and other necessary tools into a garbage bag and took them away.
Afterwards, the three of them stopped by the supermarket to buy supplies, and then took a taxi from the school gate to test the light source.
In the end, he arrived at Magic City Light Source ten minutes early.
The three registered at the guard, entered the test building, and found the BL14B1 line station.
There is only one teacher on duty in the office. It seems that users in the previous group should have ended the experiment early.
Xu Qiu exchanged a few words with the teacher on duty and learned that the other party's name was Xu Yungui, or his family.
Han Jiaying went to the test room and put a good sample of her, and Mr. Xu Yungui began to cut and debug it.
At this time, Xu Qiu discovered something unusual.
On the next computer screen, the beam energy column shows 18keV.
Xu Qiu pointed to the value and asked the teacher on duty, "Hello teacher, I see here it shows that we used X-rays with an energy of 18 kiloelectron volts this time, and our previous two tests were both 10 kilo electrons volt."
"Oh, the energy of the light source was adjusted once about a week ago, because it is troublesome to switch the X-ray energy every time, so the timings of the same energy are arranged together." Xu Yungui explained:
"As for most samples, they are not sensitive to X-ray energy and can be measured at 10 or 18 kiloelectron volts. Have you measured 18keV before?"
Xu Qiu hadn't participated in the previous test. He looked at the senior sister and passed a questioning look.
Chen Wanqing understood, and then said: "I remember that it was 10keV before. I think most of the literature uses 10keV."
Xu Yungui thought for a while and said, "Well, let's try the test first. If the test result is really not good, just tell me, this test opportunity will be invalidated.
I can help you apply for a new timing arrangement. Of course, you can also send an email to the contact person at the user office so that he will only give you 10keV light in the future. "
"Okay, thank you teacher." Xu Qiu said.
"It's okay, let's continue debugging." Xu Yungui said.
...
After more than an hour, the debugging was completed.
Chen Wanqing started the test. The first sample is Han Jiaying's P3T system, and the exposure time is set to 10 seconds.
Thirteen seconds later, the exposure and imaging are over, and the sample signal can be vaguely seen.
Subsequently, the senior sister increased the exposure time to 100 seconds.
In the new image obtained, the sample signal is more obvious.
Xu Yungui leaned over, carefully observed the images on the computer, and said:
"The signal looks okay, the signal peaks in and out of the plane are coming out, so you can continue to test according to the current situation."
Afterwards, he asked again: "Do you know all the basic operations of searching and switching light."
Xu Qiu nodded and said, "It will be."
"Then I'll leave you a contact information, and you can call me directly if you have any problems."
Continue testing.
The data obtained from samples No. 2 to No. 4 seems to be no problem.
It seems that the increase in X-ray energy has no effect on the experimental results.
When the fifth sample could be measured, Chen Wanqing suddenly discovered that there were many high-intensity impurity spots in the sample signal.
And according to the previous processing method, I tried to rotate the sample angle, but found that no matter how it was rotated, these impurities could not be completely removed.
Since Han Jiaying's division of labor is to change the samples, the back and forth rotation angles made her trouble.
Regarding this point, Xu Qiu guessed that high-energy X-ray testing has higher requirements for samples and must meet conditions such as extremely flat films.
But now that the sample has been prepared, it can only be further optimized later. For example, the No. 5 sample in front of it can only be abandoned.
During subsequent testing, similar situations occurred several times.
With the first experience, Xu Qiu gave up directly when the sample failed to test smoothly after changing the angle three times in a row.
Fortunately, each system has prepared three backup samples, but there is no problem of missing data in a certain system.
In addition, Xu Qiu has another discovery:
When tested at 18keV, the signal strength will be stronger than that of 10keV, which means that it is difficult to directly compare the data between the two.
Fortunately, he came prepared this time, and samples were prepared for all four systems, otherwise the old PCE11 data tested before cannot be used, and the test will be made again later.
...
It was more than two o'clock in the morning.
The broadcast sound of the light source suddenly sounded:
"Emergency notice. Because the beam is unstable, the light supply is now stopped. Please shut down the light path at all stations. The recovery time of the beam will be notified separately. Emergency notice..."
The notice was repeated three times in total.
Xu Qiu and Han Jiaying were changing samples in the test chamber, and they were all taken aback when they heard the sound.
"Ah, this..." Han Jiaying smiled embarrassedly: "Our luck is too bad~EbookFREE.me~ Hey, no way, this is the first time I have encountered this situation," Xu Qiu spread his hands. Said: "Just follow the normal process and turn off the main control switch."
After turning off the main control switch, the two returned to the office.
Chen Wanqing also looked depressed and said: "There are still more than ten samples left, and the test is almost finished. I don't know how long to stop. By the way, should we notify the teacher on duty?"
Xu Qiu thought for a while and said, "Don't bother others, I have already followed the instructions just now, it should be no problem."
"Okay," Chen Wanqing nodded, took out the biscuits and yogurt from her schoolbag and gave them to the other two, and said:
"It's just this time to replenish energy."
At this time, the landline "bell bell" rang.
The three looked at each other, and finally the senior sister and senior sister seemed to have reached an agreement and looked at Xu Qiu at the same time.
Xu Qiu reluctantly answered the phone.
"Hey, I heard the radio said it was all down, you know how to operate it." Xu Yungui's voice was in the receiver.
"I know, I have turned off the master control switch as required." Xu Qiu said.
"That's good, wait a little longer, it usually doesn't last too long." Xu Yungui comforted.
"Good, good." Xu Qiu said.
After that, the other party hung up the phone first. Xu Qiu took the Weiquan lactic acid bacteria handed by the senior sister, unscrewed the lid, drank tons, and ate a few biscuits to cushion his stomach.
Chen Wanqing is not very sleepy, so she took out her mobile phone and started chasing drama.
Han Jiaying seemed to be a little confused. She yawned, narrowed her eyes, held her arms, and curled up in the chair.
Xu Qiu was also a little sleepy, lying on the chair, closed his eyes, and began to close his eyes to rest.
The senior sister looked at the two next to her and plugged in the earphones silently.