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In this work, we present the concept for large low-background experiments inwhich an unusual gas mixture gas serves as a seamless, high-QE,near-100\%-coverage photodetector for scintillation or \cerenkov photons. Wefill a large time projection chamber with a VUV scintillating gas, plus anunusually small admixture dopant gas with a low ionization threshhold (and ahigh ionization yield), akin to a highly-underquenched Penning mixture.Scintillation photons travel far from a primary ionization site beforeconverting into photoionization electrons. Using standard TPC methods, we canseparately count both the primary ionization electrons (which occur along adense track) and the scintillation-ionization electrons (which will occur overa large spherical region) without the use of PMTs. The scheme is compatiblewith very large detectors, in both two-phase and single-phase high pressureconfigurations. We discuss how the drift-axis position of an event can bereconstructed, and under what constraints we can expect stable gas gainoperations. We propose some detectors illustrating how this scheme---both inconventional two-phase geometries, as well as in pressurized space insolution-mined salt cavern---makes it possible to safely construct gas timeprojection chambers of previously-unreachable target masses, capable ofstudying dark matter, double beta decay, proton decay, and solar neutrinos;more speculative gas mixtures might extend the technique to reactor andgeoneutrinos

Sub-Penning gas mixtures: new possibilities for ton- to kiloton-scale time projection chambers