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The idea of a hermetic quartz chamber in a dual-phase xenon time projectionchamber (TPC) has the potential to improve the detector sensitivity for directdark matter searches in the future. A major challenge facing TPC detectors infuture dark matter experiments will be the reduction of the internal backgroundsuch as $^{222}$Rn and the deterioration of the ionization signal due toelectronegative impurities. The hermetic quartz chamber can isolate the TPC'ssensitive volume from external interference and is thus expected to preventcontamination caused by the radioactive and electronegative impurities, whichoriginate from outer detector materials. At the Kamioka Observatory in Japan,we developed a TPC with a quartz chamber that contains a $\phi 48 \times 58$ mmvolume of liquid xenon. At this development stage, we did not aim at theperfect hermeticity of the quartz chamber. Our aim here is twofold: first, todemonstrate via the use of a calibration source that the presence of quartzmaterials in the TPC does not impact its operation; and second, to performquantitative measurements of the TPC's characteristics. We successfullymeasured electron drift velocities of 1.2--1.7 mm/$\mu$s in liquid xenon underelectric fields ranging from 75--384 V/cm, and also observed small S2 signalsproduced by a single ionized electron with a light yield of 16.5 $\pm$ 0.5 PE.These results were consistent with the expected values; therefore, ourdemonstrations provide a proof of principle for TPCs incorporating a quartzchamber.

Development of Dual-phase Xenon TPC with a Quartz Chamber for Direct Dark Matter Search