  We present the calibration strategy for the 20 kton liquid scintillator
central detector of the Jiangmen Underground Neutrino Observatory (JUNO). By
utilizing a comprehensive multiple-source and multiple-positional calibration
program, in combination with a novel dual calorimetry technique exploiting two
independent photosensors and readout systems, we demonstrate that the JUNO
central detector can achieve a better than 1% energy linearity and a 3%
effective energy resolution, required by the neutrino mass ordering
determination.

Instrumentation and Detectors;High Energy Physics - Experiment