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Afterpulse Prediction for the SUB-Millicharge ExperimenT (SUBMET)

Year: 2026
Type: article
Abstract: The SUB-Millicharge ExperimenT (SUBMET) investigates an unexplored parameter space of millicharged particles with mass $m_\chi <$ 1.6 GeV/c$^2$ and charge $Q_\chi < 10^{-3}e$. The detector consists of an Eljen-200 plastic scintillator coupled to a Hamamatsu Photonics R7725 photomultiplier tube (PMT). PMT afterpulses, delayed pulses produced after an energetic pulse, have been observed in the SUBMET readout system, especially following primary pulses with a large area. We present a prediction method for afterpulse rates based on measurable parameters, which reproduces the observed rate with approximately 20% precision. This approach enables a better understanding of afterpulse contributions and, consequently, improves the reliability of background predictions.
DOI: 10.1093/ptep/ptag017
Authors: Claudio Campagnari, Sungwoong Cho, Suyong Choi, Seokju Chung, Matthew Citron, Ryan De Los Santos, Albert De Roeck, Martin Gastal, Seungkyu Ha, Andy Haas, Christopher Scott Hill, Byeong Jin Hong, Haeyun Hwang, Insung Hwang, Hoyong Jeong, Minseo Kim, Hyunki Moon, Jayashri Padmanaban, Ryan Schmitz, Changhyun Seo, David Stuart, Juan Salvador Tafoya Vargas, Eunil Won, Jae Hyeok Yoo, Jinseok Yoo, Ayman Youssef, Ahmad Zaraket, Haitham Zaraket, Collin Zheng
Institutions: University of California, Santa Barbara, Korea University, University of California, Davis, The Ohio State University, European Organization for Nuclear Research, New York University, Lebanese University
Language: English
Open Access status: gold
Estimated APC paid: $979
Funders: National Science Foundation, U.S. Department of Energy, National Research Foundation, Korea University, National Research Foundation of Korea, Université Libanaise, Ministry of Science and ICT, South Korea
OpenAlex ID: W4416248484
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Cites: 6
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