Engineers operate mechanical arms to maintain equipment in the hot cell of the China Spallation Neutron Source (CSNS) in Dongguan, south China's Guangdong Province, Sept. 1, 2017. According to a press conference held by the Institute of High Energy Physics of Chinese Academy of Sciences in Dongguan Friday, a neutron beam was successfully obtained at the CSNS for the first time on Aug. 28, 2017, which marks the completion of the main construction and the start of the test operation phase for the CSNS project, a national large scientific facility. The project should be fully completed and open to domestic and overseas users by 2018 as scheduled. (Xinhua/Jin Liwang) 

Photo taken on Sept. 1, 2017 shows the radiation protection gate at the entrance of circular accelerator for the China Spallation Neutron Source (CSNS) in Dongguan, south China's Guangdong Province. According to a press conference held by the Institute of High Energy Physics of Chinese Academy of Sciences in Dongguan Friday, a neutron beam was successfully obtained at the CSNS for the first time on Aug. 28, 2017, which marks the completion of the main construction and the start of the test operation phase for the CSNS project, a national large scientific facility. The project should be fully completed and open to domestic and overseas users by 2018 as scheduled. (Xinhua/Jin Liwang) 

Combination photo taken on Sept. 1, 2017 shows the circular accelerator for the China Spallation Neutron Source (CSNS) in Dongguan, south China's Guangdong Province. According to a press conference held by the Institute of High Energy Physics of Chinese Academy of Sciences in Dongguan Friday, a neutron beam was successfully obtained at the CSNS for the first time on Aug. 28, 2017, which marks the completion of the main construction and the start of the test operation phase for the CSNS project, a national large scientific facility. The project should be fully completed and open to domestic and overseas users by 2018 as scheduled. (Xinhua/Jin Liwang)