Development of an on-line attenuation length monitor for JUNO

The future neutrino experiment JUNO (Jiangmen Underground Neutrino Observatory) will determine the neutrino mass hierarchy by observing reactor neutrinos in liquid scintillator. To reach the required energy resolution of 3% @ 1MeV, a very good LS transparency (attenuation length a $\le$ b 20 m @ 430 nm) is required. There are several purification processes for the LS during the liquid handling in Juno Before filling, the quality of the LS will be monitored by measuring the attenuation length. This talk covers the development and testing of an on-line attenuation length monitor for LS quality control. In a relative measurement over two scintillator samples, potential changes in the attenuation length will be monitored.