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arXiv · 2302.06170

Restoring the saturation response of a PMT using pulse-shape and artificial-neural-networks

Hyun-Gi Lee·Jungsic Park
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Abstract

The linear response of a photomultiplier tube (PMT) is a required property for photon counting and reconstruction of the neutrino energy. The linearity valid region and the saturation response of PMT were investigated using a linear-alkyl-benzene (LAB)-based liquid scintillator. A correlation was observed between the two different saturation responses, with pulse-shape distortion and pulse-area decrease. The observed pulse-shape provides useful information for the estimation of the linearity region relative to the pulse-area. This correlation-based diagnosis allows an ${in}$-${situ}$ estimation of the linearity range, which was previously challenging. The measured correlation between the two saturation responses was employed to train an artificial-neural-network (ANN) to predict the decrease in pulse-area from the observed pulse-shape. The ANN-predicted pulse-area decrease enables the prediction of the ideal number of photoelectrons irrelevant to the saturation behavior. This pulse-shape-based machine learning technique offers a novel method for restoring the saturation response of PMTs.

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Hyun-Gi Lee, Jungsic Park. 2023-02-13. Restoring the saturation response of a PMT using pulse-shape and artificial-neural-networks. https://arxiv.org/abs/2302.06170

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