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As liquid xenon TPCs increase in target mass while pursuing the directdetection of WIMP dark matter, the technical challenges arising due to theirsize call for new solutions and open the discussion on alternative detectorconcepts. Proportional scintillation in liquid xenon allows for a single-phasedesign evading all problems related to the liquid-gas interface and the precisegas gap required in a dual-phase TPC. Aside from a different scintillationmechanism, the successful detection- and analysis scheme of state-of-the-artexperiments is maintained in this approach. We study the impact on chargesignal analysis in a single-phase detector of DARWIN dimensions, where the fasttiming of the proportional scintillation signal allows for the preciseidentification of the single electrons in the ionisation signal. Such adiscrete electron-counting approach leads to a better signal resolution for lowenergies when compared to the classical dual-phase continuous method. Theabsence of the liquid-gas interface further benefits the S2-only energyresolution significantly. This reduces the uncertainties from the scintillationand signal-detection process to a level significantly below the irreduciblefluctuation in the primary ionisation. Exploiting the precise electron timeinformation further allows for a powerful single vs.~multiple site interactiondiscrimination with 93% rejection efficiency and 98% signal acceptance. Thisoutperforms the design goal of the DARWIN observatory by a reduction factor of4.2 in non-rejected multiple site neutron events.

Prospects of charge signal analyses in liquid xenon TPCs with proportional scintillation in the liquid phase