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With the expanding reach of physics, xenon-based detectors such as PandaX-4Tin the China Jinping Underground Laboratory aim to cover an energy range fromsub-keV to multi-MeV. A linear response of the photomultiplier tubes (PMTs) isrequired for both scintillation and electroluminescence signals. Through adedicated bench test, we investigated the cause of the non-linear response inthe Hamamatsu R11410-23 PMTs used in PandaX-4T. The saturation and suppressionof the PMT waveform observed during the commissioning of PandaX-4T were causedby the high-voltage divider base. The bench test data validated thede-saturation algorithm used in the PandaX-4T data analysis. We also confirmedthe improvement in linearity of a new PMT base design, which will be used toupgrade the PMT readout system in PandaX-4T.

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