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Improvement on the Linearity Response of PandaX-4T with new Photomultiplier Tubes Bases

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arxiv 2401.00373 v2 pith:CP2X3FJI submitted 2023-12-31 physics.ins-det hep-ex

Improvement on the Linearity Response of PandaX-4T with new Photomultiplier Tubes Bases

Lingyin Luo , Deqing Fang , Ke Han , Di Huang , Xiaofeng Shang , Anqing Wang , Qiuhong Wang , Shaobo Wang
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Siguang Wang Xiang Xiao Binbin Yan Xiyu Yan
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classification physics.ins-det hep-ex
keywords pandax-4tresponseusedbasebenchdataimprovementlinearity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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With the expanding reach of physics, xenon-based detectors such as PandaX-4T in the China Jinping Underground Laboratory aim to cover an energy range from sub-keV to multi-MeV. A linear response of the photomultiplier tubes (PMTs) is required for both scintillation and electroluminescence signals. Through a dedicated bench test, we investigated the cause of the non-linear response in the Hamamatsu R11410-23 PMTs used in PandaX-4T. The saturation and suppression of the PMT waveform observed during the commissioning of PandaX-4T were caused by the high-voltage divider base. The bench test data validated the de-saturation algorithm used in the PandaX-4T data analysis. We also confirmed the improvement in linearity of a new PMT base design, which will be used to upgrade the PMT readout system in PandaX-4T.

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  1. Measurement of solar $pp$ neutrino flux with the new PandaX-4T data

    hep-ex 2026-07 unverdicted novelty 4.0

    PandaX-4T Run 2 data yields solar pp neutrino flux of (8.5 ± 3.5)×10^{10} cm^{-2}s^{-1} at 2.2σ, first positive indication below 165 keV electronic recoil.