Talk:Jiangmen Underground Neutrino Observatory

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Sources for Jiangmen Underground Neutrino Observatory[edit]

These were in Talk:Daya Bay Reactor Neutrino Experiment; copid here in case they're useful.

Main web site
Li, Yu-Feng (25 Feb 2014). "Overview of the Jiangmen Underground Neutrino Observatory (JUNO)". arXiv:1402.6143 [physics.ins-det].
He, Miao (13 Dec 2014). "Jiangmen Underground Neutrino Observatory". arXiv:1412.4195 [physics.ins-det]. (Short, but current. To be published in the proceedings of the Neutrino Oscillation Workshop (NOW) 2014; presentation slides linked below.)
Li, Xiaonan (August 2013). Daya Bay II: Jiangmen Underground Neutrino Observatory (JUNO) (PDF). Windows On the Universe.
Lu, Jia-Shu; Cao, Jun; Li, Yu-Feng; Zhou, Shun (23 Dec 2014). "Constraining Absolute Neutrino Masses via Detection of Galactic Supernova Neutrinos at JUNO". arXiv:1412.7418 [hep-ph].

This is the successor to Daiya Bay. Farther (53 km) from the source reactors for neutrino physics reasons, and much larger (20 kt) to compensate. Based on documents saying that it's 53 km from both Yangjiang Nuclear Power Station and Taishan Nuclear Power Plant, that would place it around 22°07′24″N 112°31′03″E / 22.123201°N 112.517488°E / 22.123201; 112.517488 (JUNO computed guess). 71.41.210.146 (talk) 22:59, 23 November 2014 (UTC)[reply]

Poster showing topo map of layout
Li, Jiao (24 March 2014), "China to build a huge underground neutrino experiment", physicsworld.com, 18 (3)
He, Miao (9 September 2014). Jiangmen Underground Neutrino Observatory (JUNO) (PDF). Neutrino Oscillation Workshop. Conca Specchiulla (Otranto, Lecce, Italy).^: 9 shows a topo overview of the complex.
JUNO Experiment (PDF). Internation Meeting for Large Neutrino Infrastructures. Paris. 24 June 2014.^: 4 explains why the site had to be moved from east of Hong Kong, equidistance from the Daya Bay and Huizhou nuclear power plants, because the new Lufeng NPP was too close and would cause interference. The new site is west of Hong Kong, equidistant from two other reactors. Page 9 explains that the baseline difference must be no more than 500m, which rather constrains the experiment location. Page 23 has a detailed contour map of the location.
Workshop on the liquid scintillator for the JUNO experiment (27-30 October 2014, at LNGS) has some relevant papers
Wang, Yifang (11–15 March 2013). JUNO: A Multi-Purpose LS-based Experiment (PDF). XV Workshop on Neutrino Telescopes (Neutel 2013). Venice. is a good description.
Chen, Hai-tao; Yu, Bo-xiang; Shan, Qing; Ding, Ya-yun; Du, Bing; Liu, Shu-tong; Zhang, Xuan; Zhou, Li; Jia, Wen-bao; Fang, Jian; Ye, Xing-chen; Hu, Wei; Niu, Shun-li; Yan, Jia-qing; Zhao, Hang; Zhao, Dao-jin (4 Sep 2014). "Aging research of the LAB-based liquid scintillator in stainless steel container". arXiv:1409.1298 [physics.ins-det].

It's hard to compare a tight topo map with countours every 10 m with the Google topo map with 200 m countours. The article has a picture of the aboveground test site, where they're drilling cores in the experimental area. I don't see the drill rig in the satellite view, but I wonder if one of the clearings around 22°06′50″N 112°31′10″E / 22.11384°N 112.51947°E / 22.11384; 112.51947 (JUNO incorrect guess) might be it.

The basic detector is 20 kt of Gd-doped LAB in a 34.5 m diameter acrylic sphere. There's more (undoped) LAB outside, and shielding fluid (water?) outside that. The inner sphere is surrounded by approx. 15,000 20" PMTs, mounted on a 37.4 m diameter stainless steel sphere. There are also 1500 veto PMTs in the shielding water. (In other words, a lot like SNO+ but scaled up 25×.) Currently there's a problem that building an acrylic sphere inside a stainless steel sphere is impractically difficult, so alternative configurations are being considered. 71.41.210.146 (talk) 01:12, 24 November 2014 (UTC)[reply]

Aha, got it. The Miao He presentation above has a topographical map on page 9, which includes a very characteristic C-shaped lake in the upper portion. That lake is unquestionably at 22°07′30″N 112°30′34″E / 22.1250°N 112.5095°E / 22.1250; 112.5095 (Lake near JUNO). After scaling and aligning the images (tricky since X and Y scaling seem to differ slightly; Mercator projection?), I suspect the drill rig is the small dark spot at 22°07′13″N 112°31′02″E / 22.12022°N 112.51713°E / 22.12022; 112.51713 (JUNO test drill rig), and the experiment proper at 22°07′06″N 112°31′07″E / 22.11827°N 112.51867°E / 22.11827; 112.51867 71.41.210.146 Assuming the reactors are +10 m above the WGS-84 ellipsoid, and the detector is −460 m, the straight-line distance between those points is 52,590 m from Yangjiang, and 52,659 m from Taishan, well within the ±500 m tolerance. The reactor positions are the averages of several reactors, anyway. (talk) 05:41, 24 November 2014 (UTC)[reply]

Additional sources (pending integration into article)[edit]

An, Fengpeng; An, Guangpeng; An, Qi; Antonelli, Vito; Baussan, Eric; et al. (10 February 2016). "Neutrino Physics with JUNO" (PDF). Journal of Physics G. 43 (3): 030401. arXiv:1507.05613. doi:10.1088/0954-3899/43/3/030401.
Ranucci, Gioacchino (6 July 2016). Status and prospects of the JUNO experiment (PDF). XXVII International Conference on Neutrino Physics and Astrophysics. London.

Excavation is underway (ground broken January 2015). Detector design finalized on acrylic sphere inside steel truss. 17K 20" PMTs, and 34K 3" PMTs (+additional for muon veto). Filling scheduled for 2020 (which is also when source reactors are scheduled). 71.41.210.146 (talk) 18:56, 12 November 2016 (UTC)[reply]

Found lots of good (and current) stuff at the NNN16 conference:

Xiao, Mengjiao (3 November 2016). JUNO central detector and calibration strategy (PDF). International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN16). Shanghai.
Qin, Zhonghua (3 November 2016). PMT instrumentation of JUNO (PDF). International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN16). Shanghai.
Grewing, Christian (3 November 2016). A new ADC chip Vulcan for PMT readout (PDF). International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN16). Shanghai.
Hsiung, Yee Bob (4 November 2016). Status of JUNO (PDF). International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN16). Shanghai.
Qian, Sen (5 November 2016). The 20 inch MCP-PMT R&D in China (PDF). International Workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN16). Shanghai.

71.41.210.146 (talk) 13:13, 16 November 2016 (UTC)[reply]

One more from December 2016:

Wang, Wei (31 December 2016). JUNO and PINGU Neutrino Experiments (PDF). 4th International Workshop on Dark Matter, Dark Energy and Matter-Antimatter Asymmetry. Hsinchu, Taiwan.

71.41.210.146 (talk) 03:41, 13 January 2017 (UTC)[reply]