Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 9: Neutrinophysik IX

T 9.3: Talk

Monday, March 19, 2018, 16:30–16:45, Z6 - HS 0.002

Status update on the laser system for monitoring the liquid scintillator transparency in JUNO — •Wilfried Depnering for the JUNO collaboration — Institute for Physics, JGU Mainz, Germany

In the last years, large-volume liquid scintillator (LS) detectors have made important contributions to low-energy neutrino physics. A future neutrino detector scaling this technology to 20 kt is the Jiangmen Underground Neutrino Observatory (JUNO). Its primary goal is to determine the neutrino mass hierarchy with at least 3σ significance. To reach that goal, an energy resolution of 3% @ 1 MeV is required. Therefore, the transparency of the LS has to be sufficiently high and stable during the whole operation time (attenuation length ≥ 20 m @ 430 nm).
One device for in-situ monitoring of the optical LS quality is a laser system inside the central detector of JUNO. It allows to detect potential aging effects of the liquid and a gradient in its refractive index. The latter can be caused by a temperature gradient and would lead to curved light propagation, which would need to be taken into account during the event reconstruction.
This talk presents the current status of the laser system. The development is funded by the DFG research unit “JUNO”.