Chapter 50: Light source test (medium)

　　The lounge has only one sofa bed and a few chairs.
　　 Xu Qiu and Chen Wanqing sat down at random to find places.
　　 Chen Wanqing whispered:
　　" The person doing the experiment over there is the staff of the light source. If I remember correctly, it should be Luo Yang.
　　 Their light source is a research institute type, so they also have their own researchers, generally doing theoretical research on the improvement of synchrotron radiation experiments, or focusing on synchrotron radiation research in certain fields.
　　 I was on the whiteboard outside just now and saw that he was the night shift staff on duty tonight. It is estimated that the people from the previous group of tests had checked out in advance, so he came over and did the experiment for a while. "
　　 "That's it," Xu Qiu nodded, and then asked: "We only have 72 samples, but we have allocated twelve hours of machine time. On average, a sample has ten minutes. Does it take that long to test?"
　　 "Well, it depends on God's will. There will be more accidents in the light source test. You will know later," Chen Wanqing said:
　　" And everyone who comes here to test may have different research fields, so the equipment needs to be re-tuned before each test.
　　 This debugging process may be very long, sometimes even two to three hours to complete. "
　　 "Well, I hope we can hurry up," Xu Qiu stretched his head to look at the office, and found that Luo Yang hadn't finished the test yet, and asked:
　　 "Can you talk about the principle of synchrotron radiation?"
　　 "Okay," Chen Wanqing said:
　　"Synchronous radiation refers to the electromagnetic radiation emitted by charged particles with a speed close to the speed of light in a magnetic field, when they move along an arc-shaped orbit.
　　 Take the Magic City light source as an example. The electrons are continuously accelerated in a toroidal accelerator. During this period, a wide-band synchrotron radiation from far-infrared to hard X-rays can be generated, and the photon energy range is 0.1-40 kEV.
　　 Among them, the energy range between 5-20 kiloelectron volts is hard X-ray, which is the type of X-ray we use, usually with an energy of 10 or 18 kiloelectron volts. "
　　 "It sounds like the principle is very simple." Xu Qiu said.
　　" After the discovery of the physical principles, most of them are very simple. People with a basic education background can understand it. The difficulty lies in the discovery process and how to apply them.
　　 is like synchrotron radiation. It was discovered by high-energy physicists a long time ago, but it has not been applied for a long time, and it is not popular with researchers because it consumes the energy of the accelerator and hinders the increase of particle energy.
It was not until later that it was discovered that synchrotron radiation can emit a continuous spectrum ranging from far infrared to X-ray, and at the same time, it has excellent performance such as high intensity, high collimation, high polarization, and precise control of characteristics. Frontier science and technology research. "Chen Wanqing said.
　　 "How can senpai know so clearly."
　　 "To engage in scientific research, we must also make good use of search engines."
　　…………
　　 After the two waited for about half an hour, Luo Yang came over and said:
　　 "I have finished the test, let's help you debug it, is it your first time to come to the light source?"
　　 "I've been here twice before," Chen Wanqing pointed to Xu Qiu and said, "He is my junior, and he came to the light source for the first time."
　　 "No wonder I think you are more familiar, what field do you do and what is the base material?" Luo Yang said.
　　 "Organic solar cells are mainly conjugated polymer materials, and the substrate is silicon wafer." Chen Wanqing said.
　　 "For each sample, the thickness of the silicon wafer and the film are about the same." Luo Yang said.
　　 "The thickness of the same batch of silicon wafers should not change much, and the thickness of the sample is generally about 100 nanometers." Chen Wanqing said.
　　 "The thickness of more than 100 nanometers can basically be ignored," Luo Yang said:
　　 "Then it will be easy. You only need to debug it once. Then when you change the sample and cut the light, you can fine-tune it. First take a sample and follow me."
　　 Xu Qiu took out the sample box and took sample No. 1 with tweezers.
　　 Then followed Luo Yang and walked to the test cabin next to him. At this time, the cabin door was open.
　　 On the left side of the door is a metal tube, which looks like an X-ray light source. In the middle is a sample stage. On the right is a screen-like thing connected with many wires, like a signal receiver. There is also a coin in front of it.
　　 Luo Yang installed a suction table on the sample table, and then motioned to Xu Qiu to put the sample on it.
　　 After placing the sample, Luo Yang pointed to the control box inside and said:
　　 "Go inside and press the search 1 button. Be careful not to touch the instrument or any lines."
　　 Xu Qiu looked at the control box, which had a row of buttons and indicator lights.
　　Because there is equipment blocking in the middle, he walked in from the left and pressed the search 1 button.
　　 Suddenly, a harsh alarm sounded.
　　 Fortunately, Xu Qiu was mentally prepared in advance, and was not surprised by the sudden sound.
　　 "You can come out, press search 2 here." Luo Yang said.
　　 There is a similar control box in the cabin near the door.
　　 Xu Qiuyuan Road back, press the search 2 button, and leave the test cabin.
　　 Then followed Luo Yang to the control box outside the hatch.
　　 On the top of this control box, there are four buttons for door, door open, light off, and light on, as well as their respective indicator lights. In addition, a key is inserted. The key has two gears, 0 and 1, and it is currently in gear 1.
　　 "This control box can only be operated when the key is inserted and turned to gear 1." Luo Yang explained.
　　 "Now press the close button."
　　 After Xu Qiu pressed the button, there was a sound of an air pump, and the hatch slowly closed from one side.
　　 When the door was completely closed, the siren stopped.
　　 Luo Yang pointed to the rectangular area surrounded by black and yellow warning tape on the ground outside the cabin door, and said:
　　 "There is a pressure sensor here. If someone passes above it during the closing process, the door will automatically open to prevent someone from being caught by the door or locked in the cabin."
　　 "Next, long press the light button."
　　 Xu Qiu did it, but this time nothing happened except for the change in the indicator light.
　　 "Okay, now there are X-rays in the test cabin," Luo Yang said:
　　 "When you are ready to change the sample after the test, first press to turn off the light, then press to open the door, after changing the sample, search 1, search 2, and finally close the door and turn on the light."
　　 "Okay." Xu Qiu nodded.
　　 Luo Yang walked a few steps to the left and came to a large console.
　　 This console has one, off two, on one, on two, alarm buttons and corresponding indicator lights. There is also a keyhole, but there is no key on it.
　　 Luo Yang explained: "This console is the X-ray master control of the current test chamber.
　　 During the test, if you hear the broadcast inside the light source saying ‘it’s light off’, you must stop the experiment immediately.
　　 Go to the control box outside the cabin and perform the operations of turning off the light and opening the door, then turn the key on it to gear 0 and remove the key.
　　 Go to the master control here again, insert the key, turn to gear 1, and press the off one and off two buttons in turn.
　　 If you plan to leave early after the test, you must also perform this operation.
　　 When the broadcast says ‘the light is restored’, go to the master control and press the ON 1 and ON 2 buttons in turn, then turn the key to gear 0 and remove the key.
　　 Then insert it into the control box outside the cabin, turn to gear 1, and the experiment can continue, but this kind of "light drop" situation is generally not encountered. "
　　 "Okay, I remember." Xu Qiu said.
　　 He has copied Luo Yang's skills with the system, so he didn't panic at all.