[ Instrument Network Instrument Development ] On April 22, 2019, the process acceptance and appraisal of the 500-meter spherical radio telescope known as "China Eye" was held at the FAST site in Pingtang County, Guizhou Province. Academicians from the Chinese Academy of Sciences, Tsinghua University, Peking University and other institutions in 19 fields and well-known experts formed an acceptance expert group to conduct the acceptance and appraisal of the FAST process. Academician Wu Xiangping served as the leader of the acceptance expert group.

After receiving the report and on-site inspection, the acceptance and identification team believed that the National Astronomical Observatory of the Chinese Academy of Sciences completed the construction tasks approved by the National Development and Reform Commission on schedule, and all performance indicators met the acceptance requirements, among which the sensitivity (L-band) and the pointing accuracy were two key. Technical indicators are better than acceptance indicators. FAST's sensitivity in the L-band is ahead of other international radio telescopes. The overall performance of the telescope system is stable and reliable. A number of valuable scientific data have been obtained during the commissioning phase, and phased scientific results have been achieved. The expert group unanimously agreed that the 500-meter spherical radio telescope project passed the process acceptance.
At the meeting, the expert group also identified the results produced during the FAST construction process and gave high praise and recognition. FAST has identified five relevant technical achievements in many fields such as structural engineering and mechanics, large-scale industrial measurement, and receiver system development as the international leading level, which has significantly improved the industrial technology level and independent innovation capability of related fields in China. At the same time, the expert group unanimously determined that the sensitivity level of the telescope has significantly led other international telescopes, and realized that China's radio telescopes are catching up to the leading leap, which is of great significance to promote China's major original breakthroughs in related disciplines.
In addition, on April 18, 2019, FAST has begun to open the observation time to domestic astronomers in the form of trial opening. The trial open observation program provided 360 hours of observation time, but received 2,200 hours of machine time applications from domestic astronomers. After the time allocation committee's review, some projects were supported and the competition was fierce. The FAST trial opening observation is of great significance and is a necessary stage for FAST to enter normal operation and fully open. In the process, the operations team can further understand the needs of scientists and familiarize scientists with the performance of telescopes.
(Original title: 500-meter spherical radio telescope passed the process acceptance and opened to domestic astronomers)

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