Sone-333 | ESSENTIAL — 2025 |

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5. Instrumentation and Readout

• Photosensors: Large-area SiPM arrays with sub-nanosecond timing; low dark count at cryogenic or cooled operation.
• Electronics: Waveform digitizers with >1 GS/s sampling, on-board triggering and real-time pulse-shape discrimination (PSD).
• Calibration systems: Deployable radioactive sources, laser light-injection, and cosmic muon trackers to map detector response.

4. Detector Concept: SONE-333

• Overview: A 333-ton-scale liquid scintillator (or hybrid scintillator-Cherenkov) detector optimized for ultra-low backgrounds.
• Target medium: Linear alkylbenzene (LAB) based scintillator with wavelength shifters; possibility of adding light yield enhancers or isotope doping for tagging.
• Geometry: Spherical inner volume surrounded by a non-scintillating buffer and an outer veto region; instrumented with high-quantum-efficiency silicon photomultipliers (SiPMs).
• Directionality approach: Use of fast-timing photosensors and Cherenkov–scintillation separation (time profile and angular reconstruction) to obtain limited directional information to reduce background from radioactivity.
• Background mitigation: Deep-underground siting (~km-water-equivalent), material screening, radon suppression, purification systems, and active vetoes for cosmogenics.