IOP Publishing, Journal of Physics: Conference Series, (32), p. 223-229, 2006
DOI: 10.1088/1742-6596/32/1/033
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While the current interferometric gravitational wave detectors are approching their nominal sensitivity, the new generation of detectors is in an advanced design phase. The Virgo collaboration is defining now the path to arrive to a complete design of the advanced version of the detector within about two years. The upgrades needed to obtain a detector with improved sensitivity in a relatively short time are here discussed.