Characterisation of Hamamatsu R11065-20 PMTs for use in the SABRE South NaI(Tl) Crystal Detectors
arXiv:2504.17209 · doi:10.1088/1748-0221/20/07/P07052
Abstract
The SABRE Experiment is a direct detection dark matter experiment using a target composed of multiple NaI(Tl) crystals. The experiment aims to be an independent check of the DAMA/LIBRA results with a detector in the Northern (Laboratori Nazionali Del Gran Sasso, LNGS) and Southern (Stawell Underground Physics Laboratory, SUPL) hemispheres. The SABRE South photomultiplier tubes (PMTs) will be used near the low energy noise threshold and require a detailed calibration of their performance and contributions to the background in the NaI(Tl) dark matter search, prior to installation. We present the development of the pre-calibration procedures for the R11065-20 Hamamatsu PMTs. These PMTs are directly coupled to the NaI(Tl) crystals within the SABRE South experiment. In this paper we present methodologies to characterise the gain, dark rate, and timing properties of the PMTs. We develop a method for in-situ calibration without a light injection source. Additionally we explore the application of machine learning techniques using a Boosted Decision Tree (BDT) trained on the response of single PMTs to understand the information available for background rejection. Finally, we briefly present the simulation tool used to generate digitised PMT data from optical Monte Carlo simulations.
References in corpus (19)
- First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment
- First Dark Matter Search with Nuclear Recoils from the XENONnT Experiment
- The DAMA/LIBRA apparatus
- Annual modulation results from three-year exposure of ANAIS-112
- Three-year annual modulation search with COSINE-100
- Qualification Tests of the R11410-21 Photomultiplier Tubes for the XENON1T Detector
- Lowering the energy threshold in COSINE-100 dark matter searches
- Characterization of SABRE crystal NaI-33 with direct underground counting
- An induced annual modulation signature in COSINE-100 data by DAMA/LIBRA's analysis method
- Improved quality tests of R11410-21 photomultiplier tubes for the XENONnT experiment
- Improving ANAIS-112 sensitivity to DAMA/LIBRA signal with machine learning techniques
- Simulation and background characterisation of the SABRE South experiment
- Detector signal characterization with a Bayesian network in XENONnT
- Waveform Simulation for Scintillation Characteristics of NaI(Tl) Crystal
- The SABRE South Technical Design Report Executive Summary
- Search for dark matter annual modulation with DarkSide-50
- Characterisation of the Temperature-dependent Dark Rate of Hamamatsu R7081-100 10" Photomultiplier Tubes
- Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl
- The DAMA/LIBRA signal: an induced modulation effect?