Lu Fangjun doesn’t like talking about himself very much. Every time he hears "You led the 'Huiyan' payload development team", he always needs to correct it: "It cannot be said that I led it, I am just a worker."
Lu Fangjun is the chief designer of the payload of "Huiyan" satellite and is also the deputy director of Institute of High Energy Physics, Chinese Academy of Sciences (hereinafter referred to as Institute of High Energy ). This year he has another identity - a representative of the 20th National Congress of the Communist Party of China.
In February 1993, he graduated from the Department of Astronomy of Beijing Normal University and entered the Institute of High Energy, Chinese Academy of Sciences, and followed Mr. Li Tibei to pursue a doctorate degree. Over the past 30 years, he has witnessed and participated in the entire process of the proposal, demonstration, development, launch and observation and research of the "Xiyan" satellite.
"Xiyan" satellite is the full name of the hard X-ray modulated telescope. It is my country's first space X-ray astronomical satellite. The main goal is to discover new high-energy activities of celestial bodies.
is precisely because it is the "first", from project establishment to pre-research to preliminary research and then to preliminary research, it has experienced unprecedented difficulties and ups and downs. Even if it reaches the normal production stage, various challenges will still occur in ways that scientific researchers have unexpectedly expected.
2015 was the time when the satellite was actually planning to deliver, but Lu Fangjun and Cao Xuelei, the chief designer of the X-ray telescope subsystem of Zhongneng, and others saw the results they least wanted to see in the test data.
On July 15, 2015, the first detector chassis of the Zhongneng Telescope was sent to the high and low temperature test chamber on the first floor of the celestial building of the Institute of High Energy, Chinese Academy of Sciences for calibration test. It is expected that the test results will be obtained early the next morning after a night of cooling. Everyone is looking forward to it. At around 6:30 in the morning the next day, Lu Fangjun entered the test room. Cao Xuelei came in with a record book from the office and said nervously that the situation was not good.
After statistics, they found that among a 576-channel detector in a chassis, only 46 channels work normally, and 93 channels have too much noise, and 437 channels have very few triggers, and basically no valid signals. These problems are disastrous and have never been encountered during the development process.
Lu Fangjun quickly convened everyone for a meeting to discuss, test and verify, and finally determined that the detector channel with excessive noise was contaminated.
In order to meet the dual requirements of product reliability and planning progress, Lu Fangjun and others formulated a complete set of strict process and environmental control measures on the one hand, and technicians from the Institute of High Energy of the Chinese Academy of Sciences followed the entire process, and on the other hand, they rushed to re-production of the detector.
Lu Fangjun still remembers that on the night of November 13, 2015, he walked home after work overtime, with the smog and the lights being dim. Recalling the situation of Zhongneng Telescope at that time, he was depressed and knew that he had to persevere.
That night, he posted a few photos taken when the weather was sunny on his WeChat Moments, and wrote: "The haze is hazy and the lights are dull, the clouds are so sad, the sky is high, the mountains are far away, the wall is white, the leaves are red and the autumn is bright." He encouraged his colleagues and cheered himself up.
On August 9, 2016, the factory report of the "Huiyan" satellite payload was approved. According to the final results of payload factory tests, the main technical indicators of high-energy X-ray telescopes have reached the international leading level; among the technical indicators of the medium-energy X-ray telescope , except for the area (because some resources on the star are given to the low-energy telescope) that are half of the indicators proposed by the British peers, the other indicators are basically the same; the detection area, energy resolution and time resolution achieved by the low-energy X-ray telescope are about 5 times higher than the indicators expected by the British peers 10 years ago.
"Ten years of difficult road is worth it." Lu Fangjun said.
On June 15, 2017, the "Xiyan" satellite was successfully launched. Lu Fangjun wrote a poem: "I don't have the wisdom to see you, and I'll go to Xijing again. The long journey is endless, because I have endless thoughts. There are so many sounds of the past, and I feel tender in my heart. It seems that the past is born for the universe."
Lu Fangjun believes that the success of the "Smart Eye" satellite has given the Chinese people their own space X-ray astronomical satellite, and also allows China to participate in international exchanges and cooperation more equally. More importantly, an excellent professional team was born in more than 20 years.
After being elected as the representative of the 20th National Congress of the Communist Party of China, Lu Fangjun, who had the universe in his heart and rarely talked about himself publicly, felt that he had more honors and responsibilities.
When he sat in Great Hall of the People and listened to the report of the 20th National Congress of the Communist Party of China, he was excited and eight words appeared in his mind: "Every man is responsible for the rise and fall of the world."
"In the ten years of the new era, all undertakings of the Party and the country have achieved great historic achievements. After enjoying the achievements brought by national development, he has the obligation to contribute to the further development of the country. This is the responsibility of each of us. As a representative of the 20th National Congress of the Party, I should shoulder greater responsibilities, which is also supreme glory." Lu Fangjun said.
Nowadays, Lu Fangjun focuses his main scientific research energy on the pre-research of the enhanced X-ray time-varying and polarization space observatory (eXTP), the successor of the "Xiangyan" satellite, and engineering management . This satellite is expected to become the international leading flagship X-ray observatory .
Lu Fangjun Photo provided by the interviewee
Source: China Science Daily
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