New analysis options in a single-phase TPC
In standard liquid xenon (LXe) dual-phase TPCs, the charge signal from the ionization electrons is converted to proportional scintillation light in a narrow region of xenon gas right above the LXe phase. Signal generation by proportional scintillation in the liquid xenon phase in a single-phase TPC could avoid all problems related to the liquid-gas interface and the precise gas gap required in a dual-phase TPC.
The new paper studies the impact on charge signal analysis in a single-phase detector of DARWIN dimensions (a cylinder of 2.6m diameter and height), where the fast timing of the proportional scintillation signal created in the LXe allows for the precise identification of the single electrons in the ionisation signal. Such a discrete electron-counting approach leads to a better signal resolution for low energies when compared to the classical dual-phase method. The absence of the liquid-gas interface further benefits the S2-only energy resolution significantly. Exploiting the precise electron time information further allows for a powerful discrimination of single vs. multiple site interactions.
Publication:
- F. Kuger, J. Dierle, H. Fischer, M. Schumann, F. Toschi
Prospects of charge signal analyses in liquid xenon TPCs with proportional scintillation in the liquid phase
arXiv:2112.11844