Afterpulse Prediction for the SUB-Millicharge ExperimenT (SUBMET)
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.
Authors
- Minseo Kim
- C. Hill (ORCID: https://orcid.org/0000-0003-0059-0779)
- H. K. Moon (ORCID: https://orcid.org/0000-0001-5213-6477)
- Ayman Youssef (ORCID: https://orcid.org/0000-0002-3264-480X)
- S. Ha (ORCID: https://orcid.org/0000-0003-2538-1551)
- Jayashri Padmanaban (ORCID: https://orcid.org/0000-0002-5057-864X)
- Chong Zheng (ORCID: https://orcid.org/0000-0002-3681-305X)
- Hoyong Jeong (ORCID: https://orcid.org/0000-0002-9067-5911)
- Seokju Chung (ORCID: https://orcid.org/0009-0004-9134-8527)
- E. Won (ORCID: https://orcid.org/0000-0002-4245-7442)
- M. Gastal
- Chang Ho Seo (ORCID: https://orcid.org/0000-0001-9465-2496)
- Haitham Zaraket (ORCID: https://orcid.org/0000-0003-3929-0431)
- Hee-Sung Hwang
- Sungwoong Cho
- C. Campagnari (ORCID: https://orcid.org/0000-0002-8978-8177)
- Jae Hyeok Yoo
- Suyong Choi
- Matthew Citron
- Ryan Schmitz
- Albert De Roeck
- Juan Salvador Tafoya Vargas
- J. Yoo (ORCID: https://orcid.org/0009-0008-1524-7424)
- B. Hong (ORCID: https://orcid.org/0000-0002-2259-9929)
- A. Haas (ORCID: https://orcid.org/0000-0002-4832-0455)
- Insung Hwang (ORCID: https://orcid.org/0000-0003-0896-2258)
- Ahmad Zaraket
- David Stuart
Institutions
- University of California, Santa Barbara (US)
- Lebanese University (LB)
- Korea University (KR)
- Sanford Broadway Medical Center (US)
- Korea University (JP)
- The Ohio State University (US)
- European Organization for Nuclear Research (CH)
- University of California, Davis (US)
Publication Details
- Journal
- Progress of Theoretical and Experimental Physics
- Published
- 2026-01-22
- DOI
- https://doi.org/10.1093/ptep/ptag017
- Primary Topic
- Radiation Detection and Scintillator Technologies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Research Foundation
- Korea University
- National Research Foundation of Korea
- Ministry of Science and ICT, South Korea