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The KNU Advanced Positronium Annihilation Experiment (KAPAE) aims to study new physical phenomena such as C-parity violation, invisible decay, and rare decay by precisely measuring the annihilation of positronium. For the KAPAE, we developed a more compact novel detector that is different from the other previous positronium research detection instrument. This detection instrument consists of a positron trigger part for positronium generated tag and 4 π gamma detection part. The precise detection instrument with a total of 393 silicon photomultiplier (SiPM) channels acquires dual signals on both sides of about 200 bismuth germinate (BGO) scintillators. The trigger part is designed to detect positron signals with plastic scintillators. In particular, the positron trigger improves efficiency by directly detecting the scintillation light. The size of the device, including the two parts is 150 x 150 x 150 !!! and is very compact.
In this thesis, I will show the design and fabrication process of the novel hermetic detector and the performance evaluation and data processing of the completed instrument. The conceptual design of the detector was done using the Geant4 tool, an MC simulation, and the physical design was planned to produce the actual detector using 3D CAD. Each component of the detector was measured individually for the basic properties. Based on this data, the device was completed through the detector manufacturing process step by step. The completed device can acquire time, location and energy data. Finally, the new hermetic detector obtained high trigger efficiency and expected sensitivity of CPT violation through preliminary data analysis. We expect to get new physics research results from the KAPAE. Furthermore, it can be used for applied research such as medical imaging such as PET.
Thesis Advisor: Prof. Hongjoo Kim