  Linear alkylbenzene (LAB) based liquid scintillator is adopted as the central
detector for the Jiangmen Underground Neutrino Observatory (JUNO) liquid
scintillator detectors. A quenching factor measurement instrument is designed
based on the Compton scattering process. Two different quenchers for the liquid
scintillator have been investigated and the result shows that the scintillation
light of the JUNO liquid scintillator can be quenched to a level. The emission
spectrum with the absence of the quencher is also showing a desired behavior.
