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The following article is Open access
Virgo upgrade investigations
F Acernese6, P Amico10, M Alshourbagy11, S Aoudia7, S Avino6, D Babusci4, G Ballardin2, F Barone6, L Barsotti11, M Barsuglia8, F Beauville1, S Birindelli11, M A Bizouard8, C Boccara9, F Bondu7, L Bosi10, C Bradaschia11, S Braccini11, A Brillet7, V Brisson8, L Brocco12, D Buskulic1, E Calloni6, E Campagna3, F Cavalier8, R Cavalieri2, G Cella11, E Chassande-Mottin7, C Corda11, A-C Clapson8, F Cleva7, J-P Coulon7, E Cuoco2, V Dattilo2, M Davier8, R De Rosa6, L Di Fiore6, A Di Virgilio11, B Dujardin7, A Eleuteri6, D Enard2, I Ferrante11, F Fidecaro11, I Fiori11, R Flaminio1,2, J-D Fournier7, O Francois2, S Frasca12, F Frasconi2,11, A Freise2, L Gammaitoni10, A Gennai11, A Giazotto11, G Giordano4, L Giordano6, R Gouaty1, D Grosjean1, G Guidi3, S Hebri2, H Heitmann7, P Hello8, L Holloway2, S Karkar1, S Kreckelbergh8, P La Penna2, N Letendre1, M Lorenzini3, V Loriette9, M Loupias2, G Losurdo3, J-M Mackowski5, E Majorana12, C N Man7, M Mantovani11, F Marchesoni10, F Marion1, J Marque2, F Martelli3, A Masserot1, M Mazzoni3, L Milano6, C Moins2, J Moreau9, N Morgado5, B Mours1, A Pai12, C Palomba12, F Paoletti2,11, S Pardi6, A Pasqualetti2, R Passaquieti11, D Passuello11, B Perniola3, F Piergiovanni3, L Pinard5, R Poggiani11, M Punturo10, P Puppo12, K Qipiani6, P Rapagnani12, V Reita9, A Remillieux5, F Ricci12, I Ricciardi6, P Ruggi2, G Russo6, S Solimeno6, A Spallicci7, R Stanga3, R Taddei2, M Tonelli11, A Toncelli11, E Tournefier1, F Travasso10, G Vajente11, D Verkindt1, F Vetrano3, A Viceré3, J-Y Vinet7, H Vocca10, M Yvert1 and Z Zhang2
1 Laboratoire d'Annecy-le-Vieux de Physique des Particules, Annecy-le-Vieux, France
2 European Gravitational Observatory (EGO), Cascina (Pi), Italia
3 INFN, Sezione di Firenze/Urbino, Sesto Fiorentino, and/or Università di Firenze, and/or Università di Urbino, Italia
4 INFN, Laboratori Nazionali di Frascati, Frascati (Rm), Italia
5 LMA, Villeurbanne, Lyon, France
6 INFN, sezione di Napoli and/or Università di Napoli ``Federico II'' Complesso Universitario di Monte S.Angelo, and/or Università di Salerno, Fisciano (Sa), Italia
7 Departement Artemis - Observatoire de la Côte d'Azur, BP 42209 06304 Nice, Cedex 4, France
8 Laboratoire de l'Accélérateur Linéaire (LAL), IN2P3/CNRS-University de Paris-Sud, Orsay, France
9 ESPCI, Paris, France
10 INFN, Sezione di Perugia and/or Università di Perugia, Perugia, Italia
11 INFN, Sezione di Pisa and/or Università di Pisa, Pisa, Italia
12 INFN, Sezione di Roma and/or Università ``La Sapienza'', Roma, Italia
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 de.ning 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.