A Light Yield Enhancement Method Using Wavelength Shifter for the STCF EMC

TL;DR

This paper proposes a wavelength shifting method using nanostructured luminophore to enhance the light yield of the STCF electromagnetic calorimeter, demonstrating a 1.59-fold increase through simulation and experiments, with verified radiation hardness.

Contribution

It introduces a novel wavelength shifting scheme with nanostructured luminophore for improved light yield in the STCF EMC, validated by both simulation and experimental testing.

Findings

Light yield improved by a factor of 1.59

NOL shows no performance degradation up to 100 krad radiation

Method verified through Monte Carlo simulation and experiments

Abstract

Super Tau-Charm Facility (STCF) is a next-generation high luminosity electron-positron collider facility and is currently one of the major options for accelerator-based particle physics experiment in China. The crystal-based electromagnetic calorimeter (EMC) with undoped CsI is a major sub-system of the STCF spectrometer. To fulfill the increasing physics requirements on measurement precision and the suffering of radiation, improving the detected light yield is an important task of STCF EMC R&D. This paper studies a "wavelength shifting in propagation" scheme for STCF EMC using the nanostructured organosilicon luminophore (NOL). The studies are performed by both Monte Carlo simulation and experimental tests. The light yield is proved to be improved by a factor of 1.59 in the experiment. Meanwhile, a study of the NOL's radiation hardness is carried out to verify the reliability of the NOL. No obvious degradation in the performance is observed with the total ionization does up to 100 krad, far beyond the total radiation dose of STCF with ten years of operation.