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EyesonSci | World's largest transparent spherical neutrino detector starts filling ultrapure water

XINHUA
發布於 9小時前 • Jin Liwang
This photo taken on Dec. 17, 2024 shows the central detector of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province. (Xinhua/Jin Liwang)

GUANGZHOU, Dec. 18 (Xinhua) -- The world's largest transparent spherical detector started filling with ultrapure water Wednesday, signifying that the construction of the neutrino research facility has reached its last critical stage.

The ultrapure water, which has been filtered through multiple stages of the water purification system, is injected at a flow rate of 100 tonnes per hour into the detector pool of the Jiangmen Underground Neutrino Observatory (JUNO), according to the Institute of High Energy Physics under the Chinese Academy of Sciences, the project's leading institution.

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The core of JUNO is a liquid scintillator detector immersed in a 44-meter-deep cylindrical pool in the underground hall buried deep in a granite layer of a hill in Kaiping, Jiangmen City, in south China's Guangdong Province. The detector is supported by a stainless steel mesh shell with a diameter of 41.1 meters, which holds an acrylic sphere with a diameter of 35.4 meters to be filled with 20,000 tonnes of liquid scintillator.

Wang Yifang (2nd R), chief scientist of the Jiangmen Underground Neutrino Observatory (JUNO), and Ma Xiaoyan (4th R), chief engineer of the JUNO, check the status of liquid filling of JUNO in Jiangmen, south China's Guangdong Province, Dec. 18, 2024. (Xinhua/Jin Liwang)
This photo taken on Dec. 17, 2024 shows photo-multiplier tubes inside the acrylic sphere of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province. (Xinhua/Jin Liwang)
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Staff members seal the bottom of a water tank with Tyvek material at the construction site of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province, Dec. 16, 2024. (Xinhua/Jin Liwang)
This photo taken on Dec. 17, 2024 shows photo-multiplier tubes seen from the top of the acrylic sphere of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province. (Xinhua/Jin Liwang)
Wang Yifang (L), chief scientist of the Jiangmen Underground Neutrino Observatory (JUNO), and Ma Xiaoyan, chief engineer of the JUNO, inspect the construction site at the bottom of a water tank of JUNO in Jiangmen, south China's Guangdong Province, Dec. 16, 2024. (Xinhua/Jin Liwang)
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This photo taken on Dec. 16, 2024 shows the central detector of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province. (Xinhua/Jin Liwang)
Ma Xiaoyan, chief engineer of the Jiangmen Underground Neutrino Observatory (JUNO), checks the bottom of a water tank of the JUNO in Jiangmen, south China's Guangdong Province, Dec. 16, 2024. (Xinhua/Jin Liwang)
Ma Xiaoyan, chief engineer of the Jiangmen Underground Neutrino Observatory (JUNO), inspects the construction site of JUNO in Jiangmen, south China's Guangdong Province, Dec. 17, 2024. (Xinhua/Jin Liwang)
Researchers pose for a group photo to mark the start of liquid filling at the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province, Dec. 18, 2024. (Xinhua/Jin Liwang)
Staff members seal the bottom of a water tank with Tyvek material at the construction site of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong Province, Dec. 16, 2024. (Xinhua/Jin Liwang)■

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