Comparison on PMT waveform reconstructions with JUNO prototype

Zhang, H.Q.; Wang, Z.; Zhang, Y.P.; Huang, Yongbo; Luo, Fengjiao; Zhang, P.; Zhang, C.C.; Xu, M.; Liu, Jin-Chang; Heng, Y. K.; Yang, Changgen; Jiang, Xiaoming; Li, F.; Ye, M.; Chen, H.S.

doi:10.1088/1748-0221/14/08/t08002

Cited by 16 publications

(16 citation statements)

References 23 publications

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“…To calculate the charges of the PMT pulses, each waveform is integrated in a time window [-20,+55] ns relative to the peak location of the signal (see Fig. 10a), considering the external trigger timing, an input impedance of 50 Ω of the electronics [80]. An exemplary waveform and charge spectrum in pC is shown in Fig.…”

Section: Charge Spectrum Calculationmentioning

confidence: 99%

Mass Testing and Characterization of 20-inch PMTs for JUNO

Abusleme,

Adam,

Ahmad

et al. 2022

Preprint

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Main goal of the JUNO experiment is to determine the neutrino mass ordering using a 20 kt liquid-scintillator detector. Its key feature is an excellent energy resolution of at least 3 % at 1 MeV, for which its instruments need to meet a certain quality and thus have to be fully characterized. More than 20,000 20-inch PMTs have been received and assessed by JUNO after a detailed testing program which began in 2017 and elapsed for about four years. Based on this mass characterization and a set of specific requirements, a good quality of all accepted PMTs could be ascertained. This paper presents the performed testing procedure with the designed testing systems as well as the statistical characteristics of all 20inch PMTs intended to be used in the JUNO experiment, covering more than fifteen performance parameters including the photocathode uniformity. This constitutes the largest sample of 20-inch PMTs ever produced and studied in detail to date, i.e. 15,000 of the newly developed 20inch MCP-PMTs from Northern Night Vision Technology Co. (NNVT) and 5,000 of dynode PMTs from Hamamatsu Photonics K. K.(HPK).

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Section: Charge Spectrum Calculationmentioning

confidence: 99%

Mass Testing and Characterization of 20-inch PMTs for JUNO

Abusleme,

Adam,

Ahmad

et al. 2022

Preprint

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“…A prototype detector [20] was built by JUNO collaboration to verify the PMT performances as the first stage and then to study the cryogenic liquid scintillator performances as the second stage for the Taishan Neutrino Observatory (TAO [21]). A stainless steel tank with a size of 3 m both in diameter and in height was filled with water (first stage) or linear alkyl benzene (LAB, second stage).…”

Section: Spmt In Juno Prototypementioning

confidence: 99%

Study of the front-end signal for the 3-inch PMTs instrumentation in JUNO

Wu¹,

Xu²,

He³

et al. 2022

Preprint

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25,600 3-inch PMTs will be installed in Jiangmen Underground Neutrino Observatory (JUNO) to achieve more precise energy calibration and to extend the physics detection potential. Performances of all bare PMTs have been characterized and these PMTs are being instrumented with the high voltage divider, underwater front-end cable, and connector. In this paper, we present a dedicated study on signal quality at different stages of the instrumentation. An optimized high voltage ratio was confirmed and finalized which improved the PMT transit time spread by 25%. The signal charge was attenuated by 22.5% (13.0%) in the 10 m (5 m) cable and it required the addition of 45 V (23 V) to compensate for the loss of PMT gain. There was a 1% overshoot following the PMT signal and no sign of reflection in the connector. A group of 16 3-inch PMTs with the full instrumentation was installed in the JUNO prototype detector together with a few 8-inch and 20-inch PMTs, which showed good stability and demonstrated a photon detection system with multiple types of PMTs.

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“…Uncorrected, this leads to an underestimation of the integrated charge carried by a scintillation signal. Remedial analysis techniques have been put forward in a number of affected experiments [22][23][24]. The impact of this effect and its correction on our charge measurements can be assessed from Fig.…”

Section: Isolation Of Low Energy Nuclear Recoils and Qf Measurementmentioning

confidence: 99%

Response of undoped cryogenic CsI to low-energy nuclear recoils

Lewis,

Collar

2021

Preprint

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The bright scintillation of pure CsI operated at liquid-nitrogen temperature makes of this material a promising dark matter and neutrino detector. We present the first measurement of its quenching factor for nuclear recoils. Our findings indicate it is indistinguishable from that for sodium-doped CsI at room temperature. Additional properties such as light yield, afterglow, scintillation decay properties for electron and nuclear recoils, and energy proportionality are studied over the 108-165 K temperature range, confirming the vast potential of this medium for rare-event searches.

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Comparison on PMT waveform reconstructions with JUNO prototype

Cited by 16 publications

References 23 publications

Mass Testing and Characterization of 20-inch PMTs for JUNO

Mass Testing and Characterization of 20-inch PMTs for JUNO

Study of the front-end signal for the 3-inch PMTs instrumentation in JUNO

Response of undoped cryogenic CsI to low-energy nuclear recoils

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