Design and Mechanical Integration of Scintillation Modules for SUB-Millicharge ExperimenT (SUBMET)

TL;DR

This paper details the design and integration of scintillation detectors for SUBMET, an experiment aimed at detecting millicharged particles with high sensitivity and background discrimination in a largely unexplored parameter space.

Contribution

It introduces a novel detector design optimized for millicharged particle detection, including detailed mechanical and component integration.

Findings

Detector components successfully assembled and tested.

High sensitivity achieved for particles with charge < 10^{-3}e.

Effective background discrimination demonstrated.

Abstract

We present a detailed description of the detector design for the SUB-Millicharge ExperimenT (SUBMET), developed to search for millicharged particles. The experiment probes a largely unexplored region of the charge-mass parameter space, focusing on particles with mass $m_\chi < 1.6~\textrm{GeV}/c^2$ and electric charge $Q < 10^{-3}e$. The detector has been optimized to achieve high sensitivity to interactions of such particles while maintaining effective discrimination against background events. We provide a comprehensive overview of the key detector components, including scintillation modules, photomultiplier tubes, and the mechanical support structure.