During the pre-development in the following years, engineers made the 30MeV electron linear accelerator, bending magnet, quadrupole magnet and ultra-high vacuum system of storage ring, as well as physical design, and achieved good results and first-hand experience, which laid a solid foundation for subsequent projects.
198 1 10 In June, China Academy of Sciences held the "Hefei Synchrotron Radiation Facility Pre-development and Physical Design Acceptance Meeting" in Hefei. The meeting held that Hefei Synchrotron Radiation Facility has basically entered the engineering conditions.
1983, the State Planning Commission approved the establishment of the National Synchrotron Radiation Laboratory in China University of Science and Technology with the document 1983 470 "Reply on the Construction of the National Synchrotron Radiation Laboratory", and the National Synchrotron Radiation Laboratory was formally established. This is the first national laboratory in China approved by the State Planning Commission.
1984, the state planning commission approved that the main project construction scale is to build a synchrotron radiation light source with an energy of 800 million electron volts and corresponding experimental facilities, with a total investment of 59.9 million yuan (including 3.5 million US dollars), which is listed in the national key and organized within a reasonable time limit.
In the expansion design of the National Synchrotron Radiation Laboratory approved by the State Planning Commission, the energy of the electron storage ring is determined to be 800MeV, the average current intensity is 100 ~ 300 Ma, and an electron linac with energy of 200MeV and pulse current intensity of 50mA is used as the injector. At the same time, it is clear that five beam lines and five experimental stations will be built, namely: photoelectron spectroscopy beam line experimental station, time-sharing spectrum beam line experimental station, soft X-ray microscopy beam line experimental station and X-ray lithography beam line experimental station.
1988, the civil engineering of National Synchrotron Radiation Laboratory was basically completed.
1March, 1989, all parts of the accelerator were installed in place and passed the local and sub-system debugging. In April of the same year, joint debugging began, and it was injected into the storage ring on the 25th. Only after 23 hours, the first storage bundle was obtained.
1989, the installation of the beam line experimental station began, and the installation and debugging of all the beam line experimental stations were completed in August 199 1. In September of the same year, synchrotron light started debugging and carried out experimental research.
19911On February 22-23, the appraisal committee organized by the State Science and Technology Commission and headed by Wang Wei made a technical appraisal of Hefei Synchrotron Radiation Accelerator and Beam Line Experimental Station. The appraisal committee believes that the main performance indexes of Hefei synchrotron designed and developed by China have reached the advanced level of similar accelerators in the world, and the main performance indexes of five synchrotron radiation beams and five experimental stations have basically reached the international level.
199 1 65438+February 26th, 2006, the national synchrotron radiation laboratory project successfully passed the national acceptance organized by the State Planning Commission. The National Acceptance Committee spoke highly of the project builders of the National Synchrotron Radiation Laboratory who successfully completed the project construction task.
1April, 1993, NSRL was officially opened to the outside world, with 6 beam lines and 6 experimental stations, which can be widely used in basic research and applied research in the fields of physics, chemistry, materials science, life science, information science, mechanics, earth science, medicine, pharmacy, agriculture, environmental protection, metrology science, X-ray lithography and ultra-micro processing.
1February, 1994, initiated by two academicians, Qian and Tang, and 34 academicians, including Wang, Xie Xide, Xie Jialin, Feng Duan and Lu Jiaxi, jointly put forward the Proposal on Concentrate on Building Hefei National Synchrotron Radiation Light Source in an All-round Way. China University of Science and Technology formally applied to the relevant state departments for the construction of the second phase project of the National Synchrotron Radiation Laboratory (hereinafter referred to as the second phase project).
1996, the national science and technology leading group approved the second phase of the project as one of the first batch of major national scientific projects in the Ninth Five-Year Plan. The State Planning Commission approved the second-phase project proposal and feasibility study report to the China Academy of Sciences in the documents of Ji Science and Technology 1997 557 and 1503 respectively, and agreed to build the "National Synchrotron Radiation Laboratory Phase II Project" based on China University of Science and Technology, with a total investment of118 million yuan.
1On April 8, 1997, the State Planning Commission approved the proposal for the NSRLII project (Ji Ji Ji Ji (1997) No.557).
1997 On August 29th, the State Planning Commission approved the feasibility study report (Jian Shen (1997) 1503).
On July 8th, 1998, the State Planning Commission approved the preliminary design report (document number JY (1998)1301).
1999, 16 On April 5, the total investment of the State Planning Commission 1999465438, the State Planning Commission approved the start of the second phase construction of the National Synchrotron Radiation Laboratory. The technical goal of the second phase project is to build 1 undulator plug-in, 8 beam lines and 8 corresponding experimental stations on the basis of fully ensuring the long-term, reliable and stable operation of the machine body and greatly improving the comprehensive current intensity, brightness and stability of the light source. After the completion, the potential of Hefei light source will be fully exerted, and it will be a synchrotron radiation light source with excellent performance, stability and reliability, and some indicators are quite advanced, and it will be at the first-class level of similar devices in the world for a long time.
65438-0999, NSRLII completed the transformation of cooling tower of water cooling system, put auxiliary equipment such as heat exchanger of air conditioning system into operation, and started the trial operation of radiation field monitoring system through debugging. The development and testing of the main components and prototypes of the accelerator subsystem have been successfully completed and passed the acceptance. The injection system has completed the grouping test of impact magnets, the assembly of pulse power supply and some tests of ceramic vacuum box. The reconstruction or development of the storage ring vacuum system, the ring main power supply of the power supply system, the related control software of the control system, the new high-frequency machine of the high-frequency system, some parts of the beam measurement system, and the undulator single magnetic block measurement system have all been completed.
199965438+February 12 An expert group composed of 9 professors and researchers from Institute of High Energy, Institute of Physics, Institute of Electrotechnics, Shanghai Synchrotron Radiation Facility, Tsinghua University and Fudan University conducted technical appraisal on 60,000 gauss superconducting torsion pendulum magnets and XAFS beam lines and stations. The meeting listened to the development report and test result report, reviewed all the information and conducted on-site inspection. The expert group believes that the 60000 Gauss superconducting torsion pendulum magnet is a complex project, which is the first in China and its comprehensive performance is in the leading position in the international devices in the same energy zone. The successful installation and debugging of the torsion pendulum magnet extends the working energy region to the field of hard X-ray, which is of great scientific significance. The main performance of XAFS line station has reached the design index, and the beam line resolution and spot stability have reached the international level of similar devices. It has been used by users and achieved good experimental results.
1999 12 19 The first meeting of the second NSRL User Committee was held in Hefei. At the meeting, the list of new user committees approved by the Chinese Academy of Sciences was read out, and the progress of the second phase of the project, the current situation of the laboratory and the light consumption plan for next year were briefly introduced. Members affirmed the work that NSRL has done for users, and put forward feasible suggestions for some problems existing in user management.
On March 20, 2000, the storage ring was opened in vacuum, and most of the equipment connected with it and the front end of all beam streamline began to be installed, and it was closed in mid-April. The front end of the beam line was installed in May. The vacuum of storage ring recovered smoothly, and the vacuum performance of each front end reached the index requirements, and passed the internal acceptance of the project. The newly-built LIGA beam line was installed in place and passed off-line debugging and acceptance.
200 1, and the operation quality is greatly improved compared with that before the transformation. The failure rate of new equipment such as the main magnet power supply of the ring and the power supply of the injection system is very low, and the vacuum system transformation and the front end of the new beam line have passed the test of operation. In May, the superconducting Wiggler was put into operation, and the LIGA station was commissioned and put into trial operation for the first time for two X-ray beams of NSRLII, and the deep lithography products with the depth of 1 mm were obtained (right). Processing high frequency cavity in the second half of the year; The impact magnet of the long straight section of the injection system is made. The processing of the undulator has been completed, and the preliminary results of magnetic field measurement and adjustment are satisfactory. Most of the power supply has been accepted, and the transformation of the control system is carried out in coordination with it. The nonstandard processing of beam line station is basically completed. Except the LIGA line in place, the mechanical measurement (rough), vacuum debugging and installation of the other seven beam lines are in full swing. The main equipment of four of the eight experimental stations has been initially installed. Other stations are also progressing smoothly, and the processing of important non-standard parts is basically completed. The renovation of most public facilities has been completed and put into use.
In May, 2002, the closed orbit correction system of NSRLII storage ring bundle was put into operation and achieved good results. Its three main components: beam closed-orbit position measurement system, correction iron system and related control system function normally. The system can meet the needs of machine operation and research.
On July 5, 2002, the undulator UD- 1 with a length of about 2.7 meters passed the expert test. Experts from Institute of High Energy Physics, Chinese Academy of Sciences, Shanghai Institute of Nuclear Science, China Academy of Sciences and China University of Science and Technology have tested the magnetic performance index of the newly-built undulator UD- 1 built by NSRLII. The field test results are consistent with the original test data with good repeatability. UD- 1 is the first undulator built in Chinese mainland to generate high brightness synchrotron radiation. Its magnetic gap range is wide, the measurement length is long, there are many magnetic measurement indexes and data, and the workload and difficulty of debugging and measuring are great. The test team believes that UD- 1 has complete debugging measurement data and excellent performance, and all indicators meet the design requirements, and the main indicators are better than the design requirements.
In 2002, the ring high frequency system was installed in June 5438+10, and the vacuum system transformation was basically completed, and the project entered the stage of joint debugging and operation. X-ray diffraction and scattering line station passed the expert test and began trial operation. The optical components of surface physics, spectral radiation standard and measurement, atomic and molecular physics and other circuits have been installed, and the preliminary debugging of the optical path has begun.
On June 65438+1October 65438+June, 2003, the expert review meeting on the design adjustment of NSRLII acousto-optic thermal experimental station was held in Hefei. The expert group consists of Academician Zhang from Institute of Acoustics of Nanjing University, Professor Zhang Xinyi from Synchrotron Radiation Research Center of Fudan University, Associate Professor Ji Chaoneng from School of Life Sciences of Fudan University, Researcher Chen Xunyuan from Basic Bureau of China Academy of Sciences, Professor Fang Rongchuan from Physics Department of China University of Science and Technology, Professor Shi Chaoshu, Professor Su Qingde from Chemistry Department and Professor Wu from School of Life Sciences. Experts listened to the contents of the scheme adjustment and the investigation results of the experimental station. The expert group thinks that the construction scheme of NSRLII has fully considered the requirements of the vacuum ultraviolet circular dichroism experimental station, and it is necessary and reasonable to adjust the scheme as soon as possible during the project. We should concentrate on establishing experimental research methods of vacuum ultraviolet circular dichroism and photoacoustic spectroscopy, and suggest that photothermal deflection spectroscopy can not be used as the acceptance content of the second phase of the project, and this work will be carried out when conditions are ripe.
On March 13, 2003, the new injection system of NSRLII passed the beam debugging. On March 4th, the annular vacuum was opened and the ceramic vacuum chamber assembly was replaced. On March 3rd, 18, beam collimation was started, and beam storage was successful. The four impact magnets can achieve a good match, the excitation current can be increased to the design value, and the highest cumulative beam intensity reaches 2 10mA. The transformation of injection system is one of the key sub-projects of NSRLII, and it is also one of the difficulties. During the debugging from June 5438 to October 2002 10, beam storage was extremely difficult. After many experiments, observation, measurement and analysis, and discussions with experts from Institute of High Energy, Shanghai Institute of Nuclear Research and KEK in Japan, it is judged that the metal coating of ceramic vacuum chamber is too thick, which causes uneven magnetic field delay, and measures such as improving key technology, strictly controlling quality, strengthening semi-finished products inspection and speeding up progress are formulated. Due to accurate judgment and proper measures. The processing of ceramic vacuum chamber components was successfully completed in just over two months. All technical indexes meet the requirements of physical design.
On March 6, 200414-/kloc-0, NSRLII passed the accelerator and beam testing meeting organized by Chinese Academy of Sciences. The experimental team consists of 10 experts from Shanghai Institute of Applied Physics, Beijing Institute of High Energy Physics and Lanzhou Institute of Modern Physics, with Academician Chen Senyu as the team leader and researchers Zhao, Xia and Xia Shaojian as the deputy team leaders. During the test, the experts of the test group examined and approved the application report submitted by the engineering headquarters, and determined the comprehensive test indicators and parameters of the whole process. They were divided into eight groups to examine and approve the test methods, test means and self-inspection results of the accelerator reconstruction project and the beam line part 12 sub-process, and retest their main performance indicators. Experts in the test group believe that the overall operation mode of the accelerator transformation project tested by NSRLII meets the basic needs of synchrotron radiation users and can be put into operation. 12 beam line and experimental station can provide users with synchronous radiation.
On May 27-28, 2004, the Basic Bureau of Chinese Academy of Sciences organized an expert group to conduct a hospital-level process appraisal of NSRLII. The appraisal team consists of 1 1 experts, with Academician Wei as the team leader and Academician Chen Senyu and Researcher Lu as the deputy team leaders. Experts listened to the report on project construction, accelerator renovation, beam line construction and experimental station construction; Hearing the process test report read by Academician Chen Senyu; The test results of the expert test group provided by the engineering headquarters were consulted; The operation of the device was observed on the spot. The evaluation team confirmed the test results submitted by the expert test team and positively evaluated the achievements made by NSRLII. After modification, the technical level of the device has been improved to a new height, the running current intensity is 300 mA, and the average beam life is more than 8 hours. When the superconducting wiggler is running, all 14 beams can emit synchronous radiation at the same time. All newly-built experimental stations are basically open to users, meeting the basic needs of most synchrotron radiation users. It is suggested that it should be put into operation as soon as possible after national acceptance.
In June 5438+February 65438+April 2004, NSRLII officially passed the national acceptance entrusted by the National Development and Reform Commission and presided over by the Chinese Academy of Sciences. The Acceptance Committee listened to the project construction report, expert inspection report, process appraisal report and pre-acceptance opinions, inspected the project site and consulted documents and files. After careful examination, the acceptance committee thinks that the National Synchrotron Radiation Laboratory has improved the technical level of the device, expanded the experimental application field, basically completed the construction target approved by the National Development and Reform Commission (formerly the State Planning Commission), and agreed that NSRLII passed the national acceptance.
On May 12, 2005, the Qi Fei Research Group of NSRLII, in cooperation with American and German scientists, first discovered a series of important intermediates-enols in the process of hydrocarbon oxidation, and its research results were published in the international authoritative academic journal Science published on May 12 in the form of Science Express. Some foreign media made relevant reports at the first time. The reviewers of Science magazine think this is a very meaningful and interesting job. Five research groups from the United States, China and Germany participated in this research, and the National Synchrotron Radiation Laboratory of China University of Science and Technology was the third participating unit. The experimental work was completed in the advanced light source and NSRLII of Lawrence Berkeley National Laboratory.
On August 4-7, 2005, the annual meeting of NSRLII2005 users was held in Tianzhu Mountain, Anhui Province. 136 representatives from 45 universities, scientific research institutions and enterprises at home and abroad attended the meeting. The meeting heard a report on the overall work, operation and opening up after the completion and acceptance of the project. Professor Shen Zhixun from Stanford University, Professor Qiao Shan from Hiroshima University, Professor T.K.sham from Canada, Bao Xinhe, Director of Dalian Institute of Chemistry, Academician Rao, Director of Institute of Biophysics of Chinese Academy of Sciences, Zhou Xingjiang, Researcher Hu Tiandou from Beijing Institute of High Energy of Chinese Academy of Sciences and Researcher He Jianhua from Shanghai Institute of Physics of Chinese Academy of Sciences were invited to give wonderful reports, introducing their respective scientific research achievements and the latest research progress in related fields. The staff of each experimental station exchanged and discussed with users, and listened to the opinions and suggestions of users of each line and station on the application of using optical machines, the development direction of disciplines, experimental techniques and methods. During the meeting, a new user expert committee was elected, consisting of 29 members from 13 scientific research institutions. Yang (Dalian Institute of Chemistry, China Academy of Sciences), Wu (Institute of High Energy, China Academy of Sciences), Zhou Xingjiang (Institute of Physics, Chinese Academy of Sciences), Feng Donglai (Fudan University), Secretary General.
On June 5438+065438+1October 19-20, 2005, NSRLII held an international seminar on development direction in Hefei to discuss the major scientific problems, advantages and development strategies that NSRLII faced in the fields of vacuum ultraviolet, soft X-ray and infrared. 19 well-known experts and scholars from SOLEIL Synchrotron Radiation Laboratory, Japanese Institute of Molecular Science, Hiroshima University, University of California, Institute of Physics, Dalian Institute of Chemical Physics, Shanghai Institute of Technical Physics, Wuhan Institute of Physics and Mathematics, Tsinghua University, Fudan University, Jilin University, China University of Science and Technology and other 19 domestic and foreign universities and research institutes attended the meeting. The meeting listened to experts in related fields' analysis of major scientific problems at the forefront of their respective disciplines and their ideas of solving their scientific problems by using NSRLII, focusing on the chemical photophysical process of vacuum ultraviolet light in life or material science, soft X-ray * * * vibration scattering of strong correlation system and infrared spectroscopy microscopy. Experts believe that NSRLII has basically met the basic conditions for carrying out these cutting-edge research. Through close cooperation with users, the existing experimental conditions, experimental techniques and methods can be reorganized, improved and perfected, which can carry out these important tasks and provide a high-level research platform for basic research in China. Experts suggest that the undulator in soft X-ray band should be established first to supplement the conditions of vacuum ultraviolet beam line experimental station.
In June 5438+February 65438+April 2005, the polarization cluster structure of relaxor ferroelectric PMN- platinum was studied by X-ray speckle method. Sinap Li's research group cooperated with researchers of NSRLII, and used NSRLII's high-brightness X-ray source to observe the changes of nano-polarized clusters in PT ferroelectric single crystals with temperature and external electric field on the experimental platform of X-ray diffraction and scattering speckle technology. Relaxation ferroelectric is a widely used functional material. The excellent mechanical and electrical properties of these materials have always been thought to be due to the polarization clusters formed by doping cations in PBT _ IO3 matrix. However, people's understanding of polarized clusters basically comes from theoretical calculation or some indirect experimental results, and there is no direct experimental evidence of polarized clusters.
65438+265438+February 0-23, 2005, NSRLII passed the on-site evaluation organized by Chinese Academy of Sciences. An expert group composed of experts from Institute of High Energy Physics of Chinese Academy of Sciences, Lanzhou Institute of Modern Physics, Shanghai Institute of Applied Physics and Institute of Physics of Chinese Academy of Sciences conducted an on-site evaluation of the operation of the reformed NSRLII in the past year. The leader of the expert group was Academician Chen Senyu. After listening to the work report, the expert group was divided into two groups: accelerator, beam line station and user opening to conduct on-site inspection, access to operation records and conduct on-site tests, gain an in-depth understanding of the operation and management, and fully affirm the overall operation, opening, user management, personnel training and scientific research achievements of NSRLII. The expert group thinks: "After the transformation of the second phase project, the operation level of Hefei light source has been greatly improved. In addition to emittance and orbital stability, the performance (current intensity and lifetime) is close to the SRC and CAMD level of similar international light sources. However, due to the lack of corresponding testing means, it is difficult to quantitatively measure whether individual sensitive light outlets reach the stability of 30 micron vertical position drift. It is suggested that attention should be paid to improving the stability of orbit in the future; Increase the annual light supply time (annual integrated current intensity), reduce the natural emittance, meet the needs of users, and truly reach the world advanced level. The expert group made two group reports, namely, on-site inspection opinions of accelerator and on-site inspection opinions of beam streamline station, as well as the overall report, experience and suggestions of on-site inspection.
On March 29th, 2006, Institute of Microelectronics, Chinese Academy of Sciences successfully developed a high linear density titanium characteristic line micro-polycrystalline Jiao Bo strip with the outermost ring width of 150nm on the NSRLII lithography platform, which realized the accurate control of the characteristic size of the zone plate pattern, with an aspect ratio of 6.7: 1. In the X-ray band, the refractive index of various materials is approximately equal to 1, so it is impossible to construct a "lens" similar to that in the visible band, and X-rays can only be focused by a zone plate. In order to meet the requirements of X-ray optics, the outermost ring of micro-polycrystalline focal zone plate must be a deep sub-micron and large aspect ratio nano-ring, so it is very difficult to make this zone plate. The research results fully prove the feasibility of deep submicron and nanometer high aspect ratio X-ray lithography in the lithography station of National Synchrotron Radiation Laboratory.
On May 29th, 2006, the soft X-ray magnetic circular dichroism (XMCD) experimental station of NSRLII eliminated the influence of external magnetic field by adding bias voltage, and successfully realized the measurement of MCD under external magnetic field. The origin of magnetism has always been the key to the application of spintronics devices. The traditional hysteresis measurement can not give the contribution of each element to magnetism, but can only get the overall effect. Using synchrotron radiation XMCD technology, X-ray energy can be accurately located at the vibration absorption of an element, and the contribution of this element to magnetism can be selectively studied, which is of great significance for understanding the magnetic origin of complex material systems. Most experimental stations based on synchrotron radiation soft X-ray magnetic circular dichroism (XMCD) can't measure MCD under the external magnetic field, because the external magnetic field greatly interferes with the electrons emitted by the sample.
In August 2006, the first annual operation meeting of NSRLII was held in Tunxi, Anhui. Fifty-six representatives from six scientific research institutions on both sides of the Taiwan Strait attended the meeting. The meeting heard a report on the transformation and operation of NSRLII and the research progress of NSRL05-06 synchrotron radiation application. Specially invited researchers from Institute of High Energy, Yan Heping from Shanghai Institute of Applied Physics, Xia from Lanzhou Institute of Near Physics and Dr. Hsinchu Light Source from Taiwan Province introduced the operation and latest progress of their respective scientific instruments.
On August 20th, 2006, 16, the annual user conference of nsr LII 2006 was held in Huangshan, Anhui. Representatives of 105 from 38 universities and research institutes at home and abroad, as well as relevant leaders of the Chinese Academy of Sciences Foundation and the National Natural Science Foundation of China attended the meeting. The meeting reported the recent development plan, machine operation report and user opening of NSRLII to the delegates. Professor Hiroyuki Oyanagi from Japan, Professor Peiqiang Yu from Canada, Professor Yang He from Taiwan Province, Professor Mai He from Institute of Physics, Professor Feng Donglai from Fudan University, Professor Wu from Institute of High Energy and Professor Li Hongnian from Zhejiang University were invited to give wonderful reports, introducing their respective scientific research achievements and the latest research progress in related fields. Among them, nearly half of the reports are influential research results obtained by using NSRLII in the past year. During the meeting, the User Expert Committee discussed and approved a number of NSRL user topics, commented on the open operation of the laboratory, and put forward suggestions and opinions on the development of the laboratory. During the meeting, a seminar on vacuum ultraviolet was held to study and discuss the development direction, short-term goals and key issues of the National Synchrotron Radiation Laboratory.
On April 5, 2007, NSRLII successfully built the vacuum ultraviolet beam line and experimental station of the new undulator. The beam line uses vacuum ultraviolet radiation generated by the undulator, and the photon energy range is 7.5- 18.0 eV, the average photon intensity is1x10/3 photons/second, and the energy resolution E/DE is about 1000. It is very difficult to suppress the higher harmonics in this band, which is the focus of international research on vacuum ultraviolet beam lines. The new beam line adopts three-stage differential gas filter, which successfully suppresses higher harmonics, and the suppression efficiency reaches 99.99%, reaching the world advanced level. Researchers have studied small biological molecules, organic molecules, drug molecules and so on. In the newly-built experimental station, infrared laser analysis combined with synchrotron radiation single photon ionization technology was used to obtain some experimental results.
On July 22-25, 2007, the 2007 annual user meeting of nsrlii was held in Dalian Institute of Chemical Physics. 105 representatives from 26 universities and research institutes at home and abroad attended the meeting. The conference has played a positive role in understanding the latest progress in the field of international synchrotron radiation application research, promoting exchanges and cooperation between domestic and foreign counterparts and understanding the needs of users.
On July 24, 2007, the seminar on the development planning of computing of Chinese Academy of Sciences was held in Dalian. Guo Chuanjie, secretary of Party Committee of China University of Science and Technology, relevant leaders of Planning Bureau and Basic Bureau of Chinese Academy of Sciences, relevant leaders of China University of Science and Technology, members of expert committee of laboratory users and some users' representatives, as well as laboratory director Wu Zhuoyao, executive director Sheng Liusi, deputy director Gao Chen, main academic backbone of experimental department and person in charge of online station attended the seminar. The meeting listened to the report on the development plan of the laboratory, and expounded the tentative plan of the laboratory from seven aspects: the positioning and development goal, history and present situation, development trend at home and abroad, key research fields, light source construction and necessary safeguard measures, on the basis of previous investigation, planning and discussion. Participants had a heated discussion. Starting from the characteristics of NSRL, facing the development of national strategy and the demand of international frontier science, they emphasized the principle of doing something, and put forward many useful opinions and suggestions, such as seriously summarizing the existing problems, adjusting the layout of key research fields, and improving the level of existing devices as much as possible.
From August 12 to August 17, 2007, the annual meeting of NSRLII operation was held in Rizhao, Shandong. The meeting summarized the operation and opening of the aircraft in the past year, and had academic exchanges and discussions with invited representatives from Beijing Institute of High Energy, Lanzhou Institute of Near Materials and Shanghai Institute of Applied Materials. Participants put forward many useful suggestions for further improving the operation quality of Hefei light source.
From June, 2007 to October, 2007, the newly-built X-ray imaging experimental station supported by the "985" project of the Ministry of Education was installed and debugged, and the spatial resolution reached 50 nanometers, reaching the international advanced level. The experimental station has the functions of absorption contrast, phase contrast imaging and three-dimensional imaging, which can be used to characterize nano/submicron materials, observe the internal structure and morphological changes of cells and tissues, and locate elements in cells, plants and pollutants, providing advanced experimental means for nano-materials, environmental science and biomedicine.
On June 5438+ 10, 2008, Yang, director of the User Expert Committee of Hefei National Synchrotron Radiation Laboratory, was selected as one of the top ten scientific and technological progress in China in 2007. Some important data of the research results were obtained at the Atomic and Molecular Physics Experimental Station of Hefei Synchrotron Radiation National Laboratory.
In March 2008, the research team led by Professor NSRLII of Qi Fei completed the simulation of interstellar plasma environment by using low-temperature plasma discharge technology, and detected a series of enols during the plasma discharge of alcohols, revealing the possibility of enols as important interstellar substances. The experimental results were published in Astrophysics Journal 676,416 (2008), the top journal of astronomy. In April, three papers of this research group were officially included in Journal of Combustion Society, and will be read out at the 32nd International Combustion Conference (the highest international conference in combustion field at present) held in Montreal, Canada in early August 2008. The selected three papers studied the low-pressure premixed laminar flame of acetylene, ethylbenzene and nitromethane respectively. Proceedings of the International Combustion Conference is one of the most famous magazines in the field of combustion research, which brings together the frontier achievements of this subject in the past two years. The selection of these three papers is another important progress in the field of combustion research after the article on the detection of enol in flame published in Science in 2005.
In June, 2008, Professor Yu Shuhong, Researcher Tian and their collaborators in Hefei National Laboratory of Microscale Material Science successfully imaged the "Geometric Star" concave escher-type copper sulfide tetrahedral microcrystals prepared by chemical method at room temperature and air environment by using the X-ray nano-three-dimensional imaging technology of NSRLII. It is intuitively revealed that concave escher microcrystals are composed of four identical hexagonal plates intersecting each other to form a structure with 14 cavities (including 6 squares and 8 triangles). Compared with traditional morphology and structure analysis techniques such as perspective electron microscope and scanning electron microscope, X-ray nano-three-dimensional imaging technology has the advantage of more intuitive analysis of complex morphology nanostructures. Related papers were published in APPL. PHYS. LETT.92,233104 (2008), and were selected as outstanding scientific research achievements in Chinese mainland and Hongkong by Nature China, and listed in the column of "Research Highlights" in June 2008.
In September, 2008, the user of Hefei National Synchrotron Radiation Laboratory —— Professor Yu Hanqing's research group of Environmental Engineering Laboratory of Chemistry Department of Chinese University of Science and Technology, used synchrotron radiation micromachining technology to prepare a new type of microelectrode for the first time. Using this microelectrode, the research team successfully measured the microscopic distribution of dissolved oxygen in aerobic nitrifying particles, and made quantitative analysis, and discussed the biochemical reaction mechanism. The experimental results have certain guiding significance for the cultivation of microbial particles and wastewater treatment. The research results have been published in Environmental Science &; Technology (4 1, 5447(2007) and 424467 (2008)) and 1 papers have been accepted by this journal.