Abstract
The XENON100 experiment aims to detect cold dark matter particles via their elastic collisions with xenon nuclei. An ultra‐low background, two‐phase time projection chamber with a total of 170 kg of xenon (65 kg in the target region and 105 kg in the active veto) has been installed at the Gran Sasso Underground Laboratory and is currently in commissioning phase. We review the design and performance of the detector and its associated systems, present status, preliminary calibration results, background prediction and projected sensitivity. With a 6000 kg‐day background‐free exposure, XENON100 will reach a sensitivity of spin‐indepedent WIMP‐nucleon cross section of 2×10−45 cm2 by the end of 2009. We also discuss ourplan to upgrade the XENON100 experiment to improve the sensitivity by another order of magnitude by 2012.
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