Abstract
Abstract
The performances of muon detectors have prominent effects on
the accuracy and application scenario of muon imaging. Previous
studies have paid more attention to the performance improvements of
muon detectors in the assembly of imaging systems and optimization
of imaging algorithms, while, the structural design and array layout
of plastic scintillators in muon detectors have received less
attention. In this work, the simulation models of plastic
scintillator, wavelength-shifting (WLS) fibers, and muon source are
constructed in the Geant4 software. On this basis, different factors
affecting light collection efficiency (LCE) have been investigated,
including muon hitting position, plastic scintillator
cross-sectional shape and size, and WLS fiber size and
position. Meanwhile, the influences of scintillator array layout,
average width, and muon energy on the position resolution
performance of the detector are investigated. The constructive
results have been listed as follows: (a) the longitudinal length of
the plastic scintillator unit, the shape and size of the WLS fiber,
and the position of the WLS fiber have a large impact on the
LCE. (b) The Right-angled triangle staggered layout is suitable for
small-sized scintillators with single-energy muon hitting, and the
Rhombus staggered layout is suitable for large-sized scintillators
with multiple-energy muon hitting. This work provides theoretical
support for the structural design and array layout of plastic
Scintillators, and it has an important significance as a guide for
the design of the subsequent muography system.