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

Understand

The idea of a hermetic quartz chamber in a dual-phase xenon time projection chamber (TPC) has the potential to improve the detector sensitivity for direct dark matter searches in the future.

• A major challenge facing TPC detectors in future dark matter experiments will be the reduction of the internal background such as $^{222}$Rn and the deterioration of the ionization signal due to electronegative impurities.
• The hermetic quartz chamber can isolate the TPC's sensitive volume from external interference and is thus expected to prevent contamination caused by the radioactive and electronegative impurities, which originate from outer detector materials.
• At the Kamioka Observatory in Japan, we developed a TPC with a quartz chamber that contains a $\phi 48 \times 58$ mm volume of liquid xenon.