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The workshop on the JUNO Top Tracker at DLNP entered its second day. JINR has been participating in the JUNO collaboration for about three years. In 2020, the reactor neutrino experiment is to be launched in China. Now the construction of the Jiangmen Underground Neutrino Observatory is well under way 150 km away from Hong Kong.  The experimental hall will be 700 m underground. The detector filled with 20 000 t of liquid scintillator will be viewed by about 18 000 photomultiplier tubes 20 in. in diameter and 25 000 photomultiplier tubes 3 in. in diameter to detect scintillation light resulting from antineutrino interactions in the detector. The main goal of the experiment is to determine the neutrino mass hierarchy by precision measurement of neutrino oscillations.