Gain and charge response of 20 inch MCP and dynode PMTs
H.Q. Zhang, Z.M. Wang, F.J. Luo, A.B. Yang, D.R. Wu, Y.C. Li, Z.H., Qin, C.G. Yang, Y.K. Heng, Y.F. Wang, H.S. Chen
TL;DR
This paper investigates the gain and charge response of 20-inch MCP and dynode PMTs used in JUNO, assessing their linearity and performance to optimize detector energy resolution.
Contribution
It provides a comparative analysis of MCP-PMT and dynode-PMT responses, including linearity studies, for the JUNO detector's photomultiplier tubes.
Findings
MCP-PMT and dynode-PMT have comparable gain responses.
Linearity of MCP-PMT charge output is characterized.
Performance insights aid in optimizing JUNO's energy resolution.
Abstract
JUNO is a 20-kton liquid scintillator detector aiming to determine the neutrino mass ordering, precisely measure the oscillation parameters, detect the astrophysical neutrinos and search for exotic physics. It is designed to reach an energy resolution of 3% at 1 MeV with the highest ever PMT coverage, using two types of 20 inch phototubes: MCP-PMT from NNVT and dynode-PMT from Hamamatsu. In this article, the gain and charge response of the MCP and dynode PMTs are investigated with the study of JUNO Central Detector prototype. The linearity of the MCP-PMT charge output is measured too to check the effect of a long tail on its charge spectrum.
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