Development of the X-ray Pixel Detector  

  

Advanced light sources, represented by synchrotron radiation facilities, are important platforms for multi-discipline researches. They are the strategic directions from the national demands, while several large-scale scientific facilities are under construction or being scheduled, including the High Energy Photon Source (HEPS), Shanghai high repetition rate XFEL and extreme light facility (SHINE), Hefei Light Source and so on, However, detector technologies of the light source beamlines became the bottleneck problem for a long time. Among them, X-ray pixel detector is a typical representative. Unfortunately, systematic studies were fully blank in this field in China before, and products were totally foreign-monopolized. To break through the dilemma, Wei Wei made pioneer studies in the X-ray pixel detector field in China, led the team and achieved two stages of key results through long-term research: 1. realized the breakthrough and filled in the blanks in the field of high-end detectors for synchrotron radiation: brought out the first domestic silicon pixel detector prototype machine, while the performance of the full system reached the level of advanced international products; the sub-project successfully passed the national acceptance inspection of HEPS-TF (High Energy Photon Source – Test Facility); the detector has been delivered for customer applications, while customers’ achievements have already began to emerge. During the development work, key techniques of pixel detectors have been broke through, especially the techniques of pixel IC chips, sensors, advanced packaging. At the meanwhile, key technology localization has also been achieved and various innovations have been made. This proved the work generally solved the problem of “being strangled” in the field of pixel detectors. 2. he led the team and aimed at the international frontier: led the development of the fine pitch pixel detector. Its spatial resolution reached the same level of the state-of-the-art research of the world, and filled in the blanks of domestic field; he for the first time proposed internationally a novel 4-D detection mode and implemented it in the field of synchrotron radiation; A series of prototype chips were successfully developed for large-scale scientific facilities including vertex detectors for particle physics experiments, Free-Electron Lasers, and so on. The work preliminarily realized “paralleling” with international studies while promoted from “pursuing”. The breakthrough of those key technologies can make beamlines in future light sources capable to realize customized detector design, thus be freed from the restrictions of foreign products and can save a large amount of national funds. Moreover, it also makes it possible to promote the beamline capabilities, or even explore brand new experiment methodologies to realize original innovations.