Study of after-pulses in the 20-inch HQE-MCP-PMT for the JUNO experiment

Wu, Qi; Qian, S.; Ma, Lishuang; Xia, Jingkai; Лубсандоржиев, Б.; Wang, Zhigang; Zhu, Yujie; Li, Haitao; Ушаков, Н.; Sidorenkov, A.; Hu, Q.Y.; Sun, Jianning; Si, Shubin

doi:10.1016/j.nima.2021.165351

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…Besides the routine performance parameters results for the 15k MCP-PMTs which are listed in ref. [17], the aging behaviour [21], the after-pulse distribution [22], the flasher signal [23] and the temperature effect on the gain, dark count and TTS [24] for the MCP-PMT for JUNO are all detailly studied.…”

Section: Performance Of the 15k Mcp-pmts For Junomentioning

confidence: 99%

Summary of the R&D of 20-inch MCP-PMTs for neutrino detection

Qian

Cao³

et al. 2021

J. Inst.

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The Jiangmen Underground Neutrino Observatory (JUNO) in China aiming to determine the neutrino mass hierarchy is under construction. A new kind of large area microchannel-plate photomultiplier tube (MCP-PMT) was put forward for the JUNO by the researchers in Institute of High Energy Physics (IHEP) in China. After breaking through several core technotical barriers, the 20-inch MCP-PMT prototype with great performance was successfully produced by the MCP-PMT group in China and got 75% PMT orders (15,000 pics) from JUNO. The mass production line and batch test system was completed in North Night Vision Technology Co., Ltd. (NNVT). The performance of the MCP-PMT including the gain, the quantum efficiency, the P/V ratio, the dark count rate and the transit time spread can be batch tested. During the mass production process, the technical progress in the cathode deposition method improved the quantum efficiency of the photocathode from 30% to 35%. The aging behaviour, temperature effect, the after-pulse distribution and the flash signal of the 20-inch MCP-PMT are all detailly studied. By August of 2020, the 15,000 MCP-PMTs, which will be installed as the central liquid scintillator detector of JUNO, have been completed and delivered to Jiangmen. The average QE at 400 nm for the 15,000 pieces of MCP-PMTs is 32%.

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Section: Performance Of the 15k Mcp-pmts For Junomentioning

confidence: 99%

Summary of the R&D of 20-inch MCP-PMTs for neutrino detection

Qian

Cao³

et al. 2021

J. Inst.

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“…For PANDA experiment and Belle II TOP counter, small sized MCP-PMTs also adopted [10,11]. For the 20-inch MCP-PMTs, many studies have been performed [12][13][14][15][16][17][18], but many are still ongoing [19,20]. One issue with further study needed is the large signal phenomenon (LSP), especially in single photoelectron (SPE) measurement with a few photons.…”

Section: Introductionmentioning

confidence: 99%

Investigating the large signal phenomenon in single photo-electron measurements of the 20-inch MCP-PMT

et al. 2023

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In this paper, we investigated a large signal phenomenon (LSP) in single photo- electron (SPE) measurement of the 20-inch MCP-PMT. The LSP will cause a long tail of the PMT output charge spectrum, and it will affect the calculation of the number of photoelectrons (PEs) collected and the gain of the PMT. To evaluate the LSP of the 20-inch MCP-PMT, a parameterization method is developed, by measurement of the LSP distribution in the full photocathode of the PMT and study of LSP variation with different voltage ratios applied for the PMT.

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