  Dual phase Xenon Time Projection Chambers (XeTPCs) are being used by several
experiments as a promising technique for direct detection of dark matter. We
report on the design and performance of a small 3-D sensitive dual phase XeTPC.
The position resolution is 2 mm in the center of detector, limited by the hole
size of the mesh at the proportional scintillation region. An energy resolution
of 1.6%({\sigma} /E) for 662 keV gamma rays is achieved by combining the
ionization and scintillation signals at a drift field of 0.5 kV/cm. This
represents the best energy resolution achieved among liquid xenon detectors.
The energy resolution is only slightly dependent on drift field. Better than 2%
energy resolution ({\sigma} /E) for 662 keV gamma rays can be achieved for
drift fields between 100 V/cm and 2 kV/cm. With high position and energy
resolutions, a dual phase XeTPC has also potential applications in surveys for
neutrinoless double-beta decay and in gamma ray imaging.
