Description
SABRE South is a rare-event physics experiment designed to test the long-standing annual modulation signal reported by the DAMA/LIBRA experiment. Both experiments use ultra-pure NaI(Tl) crystals operated in low-background detector environments. Unlike DAMA/LIBRA, SABRE South features an active liquid scintillator veto system surrounding the crystals, instrumented with photomultiplier tubes (PMTs). The veto system is designed not only to reject background events, but also to provide information on the particles responsible for them.
This contribution focuses on simulation and data analysis of the optical calibration of the SABRE South active veto PMTs. Reliable optical calibration of the veto PMTs is important for monitoring gain and timing stability, understanding the detector response, and supporting particle-identification studies. To support this, simulation and analysis tools are being developed to model, compare, and validate optical calibration procedures for the veto system. Geant4 simulations and Python/ROOT analysis tools will be used to model optical photon transport, PMT response, trigger-related effects, and the expected structure of recorded calibration data.
Measured calibration data will then be compared directly with simulated expectations, allowing the calibration procedure to be refined before application to the SABRE South system at the Stawell Underground Physics Laboratory. The expected outcome is a robust optical calibration and monitoring framework to support SABRE South commissioning, improve long-term detector stability, and reduce instrumental uncertainties relevant to the dark matter annual modulation search.
| I am the presenting author | Yes |
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