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The XENON experimental program aims to detect cold dark matter particles viatheir elastic collisions with xenon nuclei in two-phase time projectionchambers (TPCs). We are currently testing a new TPC at the 100 kg scale,XENON100. This new, ultra-low background detector, has a total of 170 kg ofxenon (65 kg in the target region and 105 kg in the active shield). It has beeninstalled at the Gran Sasso Underground Laboratory and is currently incommissioning phase. We review the design and performance of the detector andits associated systems, present status, preliminary calibration results,background prediction and projected sensitivity. With a 6000 kg-daybackground-free exposure, XENON100 will reach a sensitivity to spin-independentWIMP-nucleon cross section of 2e-45 cm2 by the end of 2009. We also discuss ourplan to upgrade the XENON100 experiment to improve the sensitivity by anotherorder of magnitude by 2012.

Status and Sensitivity Projections for the XENON100 Dark Matter Experiment