Experimental investigation of saturation recovery behavior in MCP-PMT

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-02-13 DOI:10.1016/j.nima.2025.170323

Kuinian Li , Yonglin Wei , Hulin Liu , Ping Chen , Luanxuan He , Riguang Chen , Xinnan Zhao , Dingjun Zhou , Jinshou Tian , Shengli Wu

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Abstract

The MCP-PMT is a single-photon sensitive detector with a time resolution of tens of picoseconds. Utilizing ALD technology to fabricate nanofilms on the inner surfaces of microchannel plates significantly prolongs the lifetime of the MCP-PMT, enabling it to achieve an integrated anode charge exceeding 10 C/cm². However, for the long-lifetime MCP-PMTs using ALD technology, high counting rate saturation can lead to recovery time extending over several hours. This study presents experimental research on the saturation recovery behavior of MCP-PMTs fabricated with varying ALD layer thicknesses. The results suggest that the saturation recovery behavior is influenced by factors such as ALD layer thickness, MCP gain, saturation degree, and saturation duration. Specifically, a thicker ALD layer, deeper saturation, and longer saturation duration are associated with longer recovery time. When the output charge is constant, increasing the MCP gain has been demonstrated to decrease the recovery time from saturation. This paper clarifies the experimental findings by analyzing charge accumulation on the oxide film layer. The composition of the secondary electron emission layer on the microchannel plate's inner wall determines the polarity of the charges accumulating on its surface, which in turn dictates the saturation recovery behavior.

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.