Talk:Jiangmen Underground Neutrino Observatory

Sources for Jiangmen Underground Neutrino Observatory
These were in Talk:Daya Bay Reactor Neutrino Experiment; copid here in case they're useful.


 * Main web site
 * (Short, but current. To be published in the proceedings of the Neutrino Oscillation Workshop (NOW) 2014; presentation slides linked below.)
 * (Short, but current. To be published in the proceedings of the Neutrino Oscillation Workshop (NOW) 2014; presentation slides linked below.)

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 22.1232°N, 112.51749°W. 71.41.210.146 (talk) 22:59, 23 November 2014 (UTC)


 * Poster showing topo map of layout
 * shows a topo overview of the complex.
 * 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
 * is a good description.
 * is a good description.

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 22.11384°N, 112.51947°W 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)

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 22.125°N, 112.5095°W. 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 22.12022°N, 112.51713°W, and the experiment proper at 22.11827°N, 112.51867°W 71.41.210.146 Assuming the reactors are +10 m above the WGS-84 ellipsoid, and the detector is &minus;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)

Additional sources (pending integration into article)
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)

Found lots of good (and current) stuff at the NNN16 conference: 71.41.210.146 (talk) 13:13, 16 November 2016 (UTC)

One more from December 2016: 71.41.210.146 (talk) 03:41, 13 January 2017 (UTC)