Tip discharge of funnel-shaped microchannel plate with a large open area ratio

Hua Cai; Jing Ma; Hui Liu; Shuaiqi Li; Jiao Lian; Wenjing Qin; Tingqiao Zhao; Tiezhu Bo; Shiyong Xie; Caili Wang; Chang Liu

doi:10.1117/12.2665549

4 April 2023 Tip discharge of funnel-shaped microchannel plate with a large open area ratio

Hua Cai, Jing Ma, Hui Liu, Shuaiqi Li, Jiao Lian, Wenjing Qin, Tingqiao Zhao, Tiezhu Bo, Shiyong Xie, Caili Wang, Chang Liu

Author Affiliations +

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 1261733 (2023) https://doi.org/10.1117/12.2665549
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

Microchannel plate (MCP) is a crucial charged-particle multiplier, whose open area ratio (OAR) is a key factor affecting the collection efficiency thereof. A funnel-shaped MCP enlarges the opening surface of the input side, increasing the odds of charged particles entering the multipliable microchannels successfully; Besides, it can both promote collection efficiency and keep high strength. It is generally believed that the larger the OAR, the better. However, our review indicated that the sharp tips of the funnel-shaped MCP with an over 90% OAR induced the lethal discharge ablation. In this paper, Vacuum Photoelectron Imaging Test Facility (VPIT) and scanning electron microscope (SEM) were applied to investigate the tip discharge phenomenon and the surface morphology of the MCP, respectively. It impacted that once the tips of the funnel-shaped were less than 100nm, the MCP was particularly prone to discharge ablation damage. Therefore, we should consider both the detection efficiency and the tip discharge on the input end of the MCPs for credible high-performance detection.

Citation Download Citation

Hua Cai, Jing Ma, Hui Liu, Shuaiqi Li, Jiao Lian, Wenjing Qin, Tingqiao Zhao, Tiezhu Bo, Shiyong Xie, Caili Wang, and Chang Liu "Tip discharge of funnel-shaped microchannel plate with a large open area ratio", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 1261733 (4 April 2023); https://doi.org/10.1117/12.2665549

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KEYWORDS

Microchannel plates

Glasses

Plasma etching

Scanning electron microscopy

Lead

Silicate glass

Electron microscopes

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