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The Advanced Virgo+ status
F Acernese1,2, M Agathos3, A Ain4, S Albanesi5,6, C Alléné7, A Allocca8,2, A Amato9,10, M Andia11, T Andrade12, N Andres7, M Andrés-Carcasona13, T Andrić14, S Ansoldi15,16, S Antier17, T Apostolatos18, E Z Appavuravther19,20, M Arène21, N Arnaud11,22, M Assiduo23,24, S Assis de Souza Melo22, P Astone25, F Aubin24, S Babak21, F Badaracco26, S Bagnasco6, J Baird21, T Baka27, G Ballardin22, G Baltus28, B Banerjee14, P Barneo12,29, F Barone30,2, M Barsuglia21, D Barta31, A Basti32,4, M Bawaj33,19, M Bazzan34,35, F Beirnaert36, M Bejger37, V Benedetto38, M Berbel39, S Bernuzzi3, D Bersanetti40, A Bertolini10, U Bhardwaj41,10, A Bianchi10,42, M Bilicki43, S Bini44,45, M Bischi23,24, M Bitossi22,4, M-A Bizouard17, F Bobba46,47, M Boër17, G Bogaert17, G. 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M Mir13, M Miravet-Tenés63, A L Mitchell10,42, C Mondal84, M Montani23,24, F Morawski37, G Morras51, B Mours76, C M Mow-Lowry10,42, F Muciaccia49,25, Suvodip Mukherjee41, A Nagar6,99, V Napolano22, I Nardecchia61,62, H Narola27, L Naticchioni25, J Neilson38,47, S Nesseris51, C Nguyen21, G Nieradka37, S Nissanke41,10, E Nitoglia65, F Nocera22, J Novak100,101,102,103, J F Nuño Siles51, M Oertel100,101,102,104,103, G Oganesyan14,52, R Oliveri100,101,102, M Orselli19,33, C Palomba25, P T H Pang10,27, F Pannarale49,25, F Paoletti4, A Paoli22, A Paolone25,105, G Pappas87, A Parisi4,69, D Pascucci36, A Pasqualetti22, R Passaquieti32,4, D Passuello4, B Patricelli32,4, R Pedurand47, R Pegna4,32, M Pegoraro35, A Perego44,45, A Pereira58, C Périgois66, A Perreca44,45, S Perriès65, J W Perry10,42, D Pesios87, C Petrillo33, K S Phukon10,89, O J Piccinni25,13, M Pichot17, M Piendibene32,4, F Piergiovanni23,24, L Pierini49,25, G Pierra65, V Pierro38,47, G Pillant22, M Pillas11, F Pilo4, L Pinard73, I M Pinto38,47,106,8, M Pinto22, K Piotrzkowski26, A Placidi19,33, E Placidi49,25, W Plastino107,94, R Poggiani32,4, E Polini7, E Porcelli10, J Portell12,29,97, E K Porter21, R Poulton22, M Pracchia7, T Pradier76, M Principe38,106,47, G A Prodi108,45, P Prosposito61,62, A Puecher10,27, M Punturo19, F Puosi4,32, P Puppo25, G Raaijmakers41,10, N Radulesco17, P Rapagnani49,25, M Razzano32,4, T Regimbau7, L Rei40, P Rettegno5,6, B Revenu21,109, A Reza10, A S Rezaei25,49, F Ricci49,25, S Rinaldi32,4, F Robinet11, A Rocchi62, L Rolland7, M Romanelli50, R Romano1,2, A Romero13, S Ronchini14,52, L Rosa2,8, D Rosińska54, S Roy27, D Rozza70,60, P Ruggi22, E Ruiz Morales51, P Saffarieh10,42, O S Salafia55,56,110, L Salconi22, F Salemi44,45, M Sallé10, A Samajdar56, N Sanchis-Gual111,63, A Sanuy12, A Sasli87, P Sassi19,33, B Sassolas73, S Sayah73, S Schmidt27, M Seglar-Arroyo7, D Sentenac22, V Sequino8,2, G Servignat101, Y Setyawati27, N S Shcheblanov112,92, M Sieniawska26, L Silenzi19,20, N Singh54, A Singha9,10, V Sipala70,60, J Soldateschi93,113,24, V Sordini65, F Sorrentino40, N Sorrentino32,4, R Soulard17, V Spagnuolo9,10, M Spera34,35, P Spinicelli22, C Stachie17, D A Steer21, J Steinlechner9,10, S Steinlechner9,10, N Stergioulas87, G Stratta114,25, M Suchenek37, A Sur37, J Suresh26, B L Swinkels10, A Syx76, P Szewczyk54, M Tacca10, N Tamanini57, A J Tanasijczuk26, E N Tapia San Martín10, C Taranto61, M Tonelli32,4, A Torres-Forné63, I Tosta e Melo60, E Tournefier7, A Trapananti20,19, F Travasso20,19, J Trenado12, M C Tringali22, L Troiano115,47, A Trovato16,98, L Trozzo2, K W Tsang10,116,27, K Turbang117,48, M Turconi17, C Turski36, H Ubach12,29, A Utina9,10, M Valentini44,45, S Vallero6, N van Bakel10, M van Beuzekom10, M van Dael10,118, J F J van den Brand9,42,10, C Van Den Broeck27,10, M van der Sluys10,27, A Van de Walle11, J van Dongen10,42, H van Haevermaet48, J V van Heijningen26, Z van Ranst9, N van Remortel48, M Vardaro89,10, M Vasúth31, G Vedovato35, P Verdier65, D Verkindt7, P Verma74, F Vetrano23, A Viceré23,24, J-Y Vinet17, S Viret65, A Virtuoso98,16, H Vocca33,19, R C Walet10, M Was7, N Yadav37, A Zadrożny74, T Zelenova22 and J-P Zendri35
55
Università degli Studi di Milano-Bicocca, I-20126 Milano, Italy
56
INFN, Sezione di Milano-Bicocca, I-20126 Milano, Italy
57
L2IT, Laboratoire des 2 Infinis - Toulouse, Université de Toulouse, CNRS/IN2P3, UPS, F-31062 Toulouse Cedex 9, France
58
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
59
Dipartimento di Fisica, Università degli Studi di Genova, I-16146 Genova, Italy
60
INFN, Laboratori Nazionali del Sud, I-95125 Catania, Italy
61
Università di Roma Tor Vergata, I-00133 Roma, Italy
62
INFN, Sezione di Roma Tor Vergata, I-00133 Roma, Italy
63
Departamento de Astronomía y Astrofísica, Universitat de València, E-46100 Burjassot, València, Spain
64
Dipartimento di Ingegneria Industriale (DIIN), Università di Salerno, I-84084 Fisciano, Salerno, Italy
65
Université Lyon, Université Claude Bernard Lyon 1, CNRS, IP2I Lyon / IN2P3, UMR 5822, F-69622 Villeurbanne, France
66
INAF, Osservatorio Astronomico di Padova, I-35122 Padova, Italy
67
Université libre de Bruxelles, 1050 Bruxelles, Belgium
68
Departamento de Matemáticas, Universitat de València, E-46100 Burjassot, València, Spain
69
Scuola Normale Superiore, I-56126 Pisa, Italy
70
Università degli Studi di Sassari, I-07100 Sassari, Italy
71
Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
72
INFN, Sezione di Milano Bicocca, Gruppo Collegato di Parma, I-43124 Parma, Italy
73
Université Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire des Matériaux Avancés (LMA), IP2I Lyon / IN2P3, UMR 5822, F-69622 Villeurbanne, France
74
National Center for Nuclear Research, 05-400 Swierk-Otwock, Poland
75
Institut d'Astrophysique de Paris, Sorbonne Université, CNRS, UMR 7095, 75014 Paris, France
76
Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
77
Institute for Nuclear Research, H-4026 Debrecen, Hungary
78
CNR-SPIN, I-84084 Fisciano, Salerno, Italy
79
Scuola di Ingegneria, Università della Basilicata, I-85100 Potenza, Italy
80
Gravitational Wave Science Project, National Astronomical Observatory of Japan (NAOJ), Mitaka City, Tokyo 181-8588, Japan
81
Observatori Astronómic, Universitat de València, E-46980 Paterna, València, Spain
82
Centro de Física das Universidades do Minho e do Porto, Universidade do Minho, PT-4710-057 Braga, Portugal
83
INAF, Osservatorio Astronomico di Capodimonte, I-80131 Napoli, Italy
84
Université de Normandie, ENSICAEN, UNICAEN, CNRS/IN2P3, LPC Caen, F-14000 Caen, France
85
Laboratoire de Physique Corpusculaire Caen, 6 boulevard du maréchal Juin, F-14050 Caen, France
86
Niels Bohr Institute, Copenhagen University, 2100 København, Denmark
87
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
88
University of Białystok, 15-424 Białystok, Poland
89
Institute for High-Energy Physics, University of Amsterdam, 1098 XH Amsterdam, Netherlands
90
Institute of Mathematics, Polish Academy of Sciences, 00656 Warsaw, Poland
92
NAVIER, École des Ponts, Univ Gustave Eiffel, CNRS, Marne-la-Vallée, France
93
Università di Firenze, Sesto Fiorentino I-50019, Italy
94
INFN, Sezione di Roma Tre, I-00146 Roma, Italy
95
ESPCI, CNRS, F-75005 Paris, France
96
School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
97
Institut d'Estudis Espacials de Catalunya, c. Gran Capità, 2-4, 08034 Barcelona, Spain
98
Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy
99
Institut des Hautes Etudes Scientifiques, F-91440 Bures-sur-Yvette, France
100
Centre national de la recherche scientifique, 75016 Paris, France
101
Laboratoire Univers et Théories, Observatoire de Paris, 92190 Meudon, France
102
Observatoire de Paris, 75014 Paris, France
103
Université PSL, 75006 Paris, France
104
Université de Paris, 75006 Paris, France
105
Consiglio Nazionale delle Ricerche - Istituto dei Sistemi Complessi, I-00185 Roma, Italy
106
Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi", I-00184 Roma, Italy
107
Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, I-00146 Roma, Italy
108
Universita di Trento, Dipartimento di Matematica, I-38123 Povo, Trento, Italy
109
Subatech, CNRS/IN2P3 - Institut Mines-Telecom Atlantique - Université de Nantes, 4 rue Alfred Kastler BP 20722 44307 Nantes C'EDEX 03, France
110
INAF, Osservatorio Astronomico di Brera sede di Merate, I-23807 Merate, Lecco, Italy
111
Departamento de Matemática da Universidade de Aveiro and Centre for Research and Development in Mathematics and Applications, 3810-183 Aveiro, Portugal
The gravitational wave detector Advanced Virgo+ is currently in the commissioning phase in view of the fourth Observing Run (O4).
The major upgrades with respect to the Advanced Virgo configuration are the implementation of an additional recycling cavity, the Signal Recycling cavity (SRC), at the output of the interferometer to broaden the sensitivity band and the Frequency Dependent Squeezing (FDS) to reduce quantum noise at all frequencies.
The main difference of the Advanced Virgo + detector with respect to the LIGO detectors is the presence of marginally stable recycling cavities, with respect to the stable recycling cavities present in the LIGO detectors, which increases the difficulties in controlling the interferometer in presence of defects (both thermal and cold defects).
This work will focus on the interferometer commissioning, highlighting the control challenges to maintain the detector in the working point which maximizes the sensitivity and the duty cycle for scientific data taking.
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