Speaker
Description
We present the design and characterization of a fully indigenous, compact plastic scintillator-based test and trigger system employing silicon photomultipliers (SiPMs) and custom-developed electronics. The system uses extruded plastic scintillator (EPS) paddles integrated with wavelength-shifting (WLS) fibers coupled to SiPMs.
Two custom, dedicated bias supplies are incorporated in the design to power the test and trigger SiPMs independently. These supplies ensure stable SiPM operation by providing regulated bias voltage with integrated digital control and monitoring. Signal readout and processing are handled by in-house front-end electronics incorporating transimpedance amplifiers, threshold discriminators, and pulse-shaping stages, followed by digital logic implementing three- and four-fold coincidence detection. Data acquisition (DAQ) is managed by an STM32 microcontroller, which performs real-time event counting using its internal hardware timers configured as counters, a cost-effective and flexible alternative to FPGA-based systems, simplifying both development and deployment.
The system adopts a modular architecture, with each unit functioning as an independent module, and offers user-friendly operation through physical controls and displays. The integrated design provides a reliable, scalable solution for compact cosmic-ray detection and trigger applications. This is used in many different schools to train younger generations on the basic principle of SiPM as well as the cosmic muon spectrum.
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