https://doi.org/10.1140/epjs/s11734-025-01967-4
Review
Future circular collider feasibility study report
Volume 2 Accelerators, technical infrastructure and safety
1
CERN, European Organization for Nuclear Research, Geneva, Switzerland
2
PSI, Paul Scherrer Institute, Villigen, Switzerland
3
CEA/Irfu, Commissariat à l’Energie Atomique et aux Energies Alternatives, Institut de recherche sur les lois fondamentales de l’Univers, Saclay, France
4
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
5
Humboldt-Universität zu Berlin, Berlin, Germany
6
BNL, Brookhaven National Laboratory, Upton, NY, USA
7
SLAC National Accelerator Laboratory, Menlo Park, CA, USA
8
University of Oxford, Oxford, UK
9
CNRS/IN2P3, Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Paris, France
10
IJCLab, Laboratoire de Physique des 2 Infinis Irène Joliot Curie, Orsay, France
11
Université Paris-Saclay et Université Paris-Cité, Paris, France
12
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari, Italy
13
Università di Bari, Bari, Italy
14
IPM, Institute for Research in Fundamental Science, Tehran, Iran
15
Malayer University, Malayer, Iran
16
LAPP, Laboratoire d’Annecy de Physique des Particules, Annecy, France
17
Université Savoie Mont Blanc, Annecy, France
18
University of Belgrade, Belgrade, Serbia
19
ICMAB/CISC, Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Científicas, Barcelona, Spain
20
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, Rome, Italy
21
Università Roma Tor Vergata, Rome, Italy
22
Yozgat Bozok Üniversitesi, Yozgat, Türkiye
23
Texas Tech University, Lubbock, TX, USA
24
TOBB ETU, TOBB Ekonomi ve Teknoloji Üniversitesi, Ankara, Türkiye
25
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Bologna, Italy
26
Università di Bologna, Bologna, Italy
27
CIEMAT, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid, Spain
28
KACST, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
29
Università Roma Tre, Rome, Italy
30
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Milano-Bicocca, Milan, Italy
31
Università di Milano-Bicocca, Milan, Italy
32
University of Cambridge, Cambridge, UK
33
İstanbul Üniversitesi, Istanbul, Türkiye
34
Eskişehir Teknik Üniversitesi, Eskişehir, Türkiye
35
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Naples, Italy
36
Università di Napoli Federico II, Naples, Italy
37
FNAL, Fermi National Accelerator Laboratory, Batavia, IL, USA
38
University of Tehran, Tehran, Iran
39
FUM, Ferdowsi University of Mashhad, Mashhad, Iran
40
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Pisa, Italy
41
University of Texas Austin, Austin, TX, USA
42
IPHC, Institut Pluridisciplinaire Hubert Curien, Strasbourg, France
43
Université de Strasbourg, Strasbourg, France
44
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Milan, Italy
45
Università di Milano, Milan, Italy
46
PIBG, Pôle Invertébrés du Basin Genevois, Geneva, Switzerland
47
UFRN, Universidade Federal do Rio Grande do Norte, Natal, Brazil
48
INFN, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Frascati, Italy
49
UNIBAS, University of Basel, Basel, Switzerland
50
Politecnico di Bari, Bari, Italy
51
LIP, Laboratório de Instrumentação e Física Experimental de Partículas, Lisbon, Portugal
52
University of Manchester, Manchester, UK
53
CI, Cockcroft Institute, Warrington, UK
54
Brandeis University, Waltham, MA, USA
55
A. Alikhanyan National Laboratory, Yerevan, Armenia
56
IP2I, Institut de Physique des 2 Infinis de Lyon, Lyon, France
57
Université Claude Bernard Lyon 1, Lyon, France
58
Ankara Üniversitesi, Ankara, Türkiye
59
Lund University, Lund, Sweden
60
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Turin, Italy
61
New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
62
Stony Brook University, Stony Brook, NY, USA
63
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Perugia, Italy
64
Università di Perugia, Perugia, Italy
65
Technische Universität München, Munich, Germany
66
Hatay Mustafa Kemal Üniversitesi, Hatay, Türkiye
67
Doğuş Üniversitesi, Istanbul, Türkiye
68
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padua, Italy
69
Harbin Institute of Technology, Harbin, People’s Republic of China
70
University of Wisconsin-Madison, Madison, WI, USA
71
RAL, Rutherford Appleton Laboratory, Science and Technology Facilities Council, Didcot, UK
72
IMSc, Institute of Mathematical Sciences, Chennai, India
73
Universität Zürich, Zurich, Switzerland
74
University of New Mexico, Albuquerque, NM, USA
75
CPPM, Centre de Physique des Particules de Marseille, Marseille, France
76
Aix-Marseille Université, Marseille, France
77
Università di Pisa, Pisa, Italy
78
HUN-REN Wigner Research Centre for Physics, Budapest, Hungary
79
Catholic University of America, Washington, DC, USA
80
Duke University, Durham, NC, USA
81
LLR, Laboratoire Leprince-Ringuet, Palaiseau, France
82
École Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
83
TRIUMF, Canada’s National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
84
Simon Fraser University, Burnaby, Canada
85
FEEM, Fondazione Ente Nazionale Idrocarburi (ENI) Enrico Mattei, Milan, Italy
86
BRGM, Bureau de Recherches Géologiques et Minières, Orléans, France
87
Işık Üniversitesi, Istanbul, Türkiye
88
İstanbul Teknik Üniversitesi, Istanbul, Türkiye
89
UNIBE, University of Bern, Bern, Switzerland
90
Università di Roma la Sapienza, Rome, Italy
91
CNR-SPIN, Consiglio Nazionale delle Ricerche, Genoa, Italy
92
Expert naturaliste et entomologiste, Rumilly, France
93
ORNL, Oak Ridge National Laboratory, Oak Ridge, TN, USA
94
HEPHY, Institut für Hochenergiephysik, Vienna, Austria
95
Geos, Bureau d’ingénieurs conseils en géotechnique, génie civil, hydraulique et environnement, Geneva, Switzerland
96
APC, Laboratoire AstroParticule et Cosmologie, Paris, France
97
Université Paris Cité, Paris, France
98
TUWIEN, Technische Universität Wien, Vienna, Austria
99
HEPIA, Haute École du Paysage, d’Ingénierie et d’Architecture de Genève, Geneva, Switzerland
100
HES-SO University of Applied Sciences and Arts Western Switzerland, Geneva, Switzerland
101
UNIGE, Université de Genève, Geneva, Switzerland
102
SETEC ALS, Société d’ingénierie conseil en infrastructures de transport, génie civil et environnement, Lyon, France
103
East Texas A&M University, Commerce, TX, USA
104
Amberg Engineering Ltd, Regensdorf-Watt, Switzerland
105
ECOTEC Environnement SA, Bureau d’études et de conseil en environnement, Geneva, Switzerland
106
Southern Methodist University, Dallas, TX, USA
107
IFJ PAN, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
108
Cerema, établissement public pour l’élaboration, le déploiement et l’évaluation de politiques publiques d’aménagement et de transport, Lyon, France
109
Rendel Ltd, Engineering design consultancy firm, London, UK
110
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, Rome, Italy
111
İstanbul Beykent Üniversitesi, Istanbul, Türkiye
112
University of Iowa, Iowa City, IA, USA
113
Indian Institute of Technology Kanpur, Kanpur, India
114
EPFL, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
115
Fakultät für Mathematik, Informatik und Naturwissenschaften, Universität Hamburg, Hamburg, Germany
116
VUB, Vrije Universiteit Brussel, Brussels, Belgium
117
LPNHE, Laboratoire de Physique Nucléaire et de Hautes Énergies, Paris, France
118
Scuola Superiore Meridionale, Naples, Italy
119
CERN, Geneva, Switzerland
120
University of Saskatchewan and the Canadian Light Source, Saskatoon, Canada
121
University of Bristol, Bristol, UK
122
Northwestern University, Evanston, IL, USA
123
University of Florida, Gainesville, FL, USA
124
York University, Toronto, Canada
125
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari, Cagliari, Italy
126
Università di Cagliari, Cagliari, Italy
127
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Pavia, Italy
128
Queen’s University, Kingston, Canada
129
CFTP-IST, Centro de Física Téorica de Partículas, Instituto Superior Tecnico, Universidade de Lisboa, Lisbon, Portugal
130
Uppsala University, Uppsala, Sweden
131
MPP, Max-Planck-Institut für Physik Garching, Garching, Germany
132
KIT, Karlsruher Institut für Technologie, Karlsruhe, Germany
133
NSC KIPT, National Science Center Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine
134
Università degli Studi dell’Insubria, Como, Italy
135
Albert-Ludwigs-Universität Freiburg, Freiburg im Breisgau, Germany
136
JAI, John Adams Institute for Accelerator Science, University of Oxford, Oxford, UK
137
CNRS/INP, Centre National de la Recherche Scientifique, Institut de Physique, Paris, France
138
LPTHE, Laboratoire de Physique Théorique et Hautes Energies, Paris, France
139
Sorbonne Université, Paris, France
140
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Genoa, Italy
141
LBNL, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
142
IIT, Instituto Italiano di Tecnologia, Genoa, Italy
143
Gümüşhane Üniversitesi, Gümüşhane, Türkiye
144
WSP Ingénieurs Conseils SA, Geneva, Switzerland
145
UADY, Autonomous University of Yucatan, Mérida, Mexico
146
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Ferrara, Italy
147
Università di Ferrara, Ferrara, Italy
148
MARCELEON, Cabinet d’ingénierie juridique et foncière, Chambéry, France
149
CSIL (Economic Research Institute), Milan, Italy
150
ETHZ, Swiss Federal Institute of Technology Zurich, Zurich, Switzerland
151
UAH, Universidad de Alcalá Madrid, Alcalá de Henares, Spain
152
CIA, Conseil Ingénierie Acoustique, Lyon, France
153
Evinerude, Bureau d’études environnementales, Lyon, France
154
LPCA, Laboratoire de Physique de Clermont Auvergne, Clermont-Ferrand, France
155
Université Clermont Auvergne, Clermont-Ferrand, France
156
ANSTO, Australian Synchrotron, Melbourne, Australia
157
Brahmananda Keshab Chandra College, Kolkata, India
158
ANL, Argonne National Laboratory, Lemont, IL, USA
159
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Lecce, Italy
160
Università di Palermo, Palermo, Italy
161
Wrocław University of Science and Technology, Wrocław, Poland
162
Rutgers University, New Brunswick, NJ, USA
163
Princeton University, Princeton, NJ, USA
164
Università di Padova, Padua, Italy
165
IUE, İzmir Ekonomi Üniversitesi, Izmir, Türkiye
166
Ege Üniversitesi, Izmir, Türkiye
167
INFN, Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Udine, Udine, Italy
168
Università di Udine, Udine, Italy
169
University of Massachusetts Amherst, Amherst, MA, USA
170
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Rome, Italy
171
CELLS/ALBA, Consortium for the Construction, Equipment and Exploitation of the Synchrotron Light Laboratory, Cerdanyola del Vallès, Spain
172
LPSC, Laboratoire de Physique Subatomique et de Cosmologie, Grenoble, France
173
Université Grenoble Alpes, Grenoble, France
174
Università degli Studi di Napoli Parthenope, Naples, Italy
175
National High Magnetic Field Laboratory, Tallahassee, FL, USA
176
Florida State University, Tallahassee, FL, USA
177
University of Johannesburg, Johannesburg, South Africa
178
IGFAE, Instituto Galego de Fisica de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
179
University of Glasgow, Glasgow, UK
180
LSE, London School of Economics, London, UK
181
Universidade de Santiago de Compostela, Santiago de Compostela, Spain
182
Imperial College London, London, UK
183
MIT, Massachusetts Institute of Technology, Cambridge, MA, USA
184
CETU, Centre d’Etude des Tunnels, Lyon, France
185
University of Liverpool, Liverpool, UK
186
Linde Kryotechnik AG, Pfungen, Switzerland
187
ILF Consulting Engineers, Zurich, Switzerland
188
NBI, Niels Bohr Institute, Copenhagen, Denmark
189
Hokkaido University, Sapporo, Japan
190
CUNI, Charles University, Prague, Czech Republic
191
Universidad de Granada, Granada, Spain
192
INFN, Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, Florence, Italy
193
University of Malta, Msida, Malta
194
BU, Boston University, Boston, MA, USA
195
IBU, Bolu Abant İzzet Baysal Üniversitesi, Bolu, Türkiye
196
Julius-Maximilians-Universität Würzburg, Würzburg, Germany
197
University of Adelaide, Adelaide, Australia
198
HIP, Helsinki Institute of Physics, University of Helsinki, Helsinki, Finland
199
ULB, Université Libre de Bruxelles, Brussels, Belgium
200
IMA, Institut für Maschinenelemente, Universität Stuttgart, Stuttgart, Germany
201
CP3, Centre de Cosmologie, de Physique des Particules et de Phénoménologie, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
202
NIKHEF, Nationaal instituut voor subatomaire fysica, Amsterdam, The Netherlands
203
IHEP, Chinese Academy of Sciences, Beijing, People’s Republic of China
204
UAS, Universidad Autónoma de Sinaloa, Culiacán, Mexico
205
BOKU, Universität für Bodenkultur Wien, Vienna, Austria
206
University of Silesia in Katowice, Katowice, Poland
207
Purdue University, West Lafayette, IN, USA
208
University of Delhi, Delhi, India
209
Ginger BURGEAP, bureau d’études en environnement, Lyon, France
210
King’s College London, London, UK
211
University of Maryland, College Park, MD, USA
212
KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
213
Geoenergy, Reservoir Geology and Basin Analysis Group, Geneva, Switzerland
214
SETEC International, Société d’ingénierie en charge des transports et des infrastructures, Lyon, France
215
KKU, Kırıkkale Üniversitesi, Kırıkkale, Türkiye
216
SETEC LERM, Société d’ingénierie conseil en matériaux de construction, Lyon, France
217
BUAP, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
218
Stanford University, Stanford, CA, USA
219
University of Pittsburgh, Pittsburgh, PA, USA
220
MUL, Montanuniversität Leoben, Lehrstuhl für Subsurface Engineering, Geotechnik und unterirdisches Bauen, Leoben, Austria
221
MUL-ZaB, Underground Research Center, Zentrum am Berg, Leoben, Austria
222
IFAE, Institut de Física d’Altes Energies, Barcelona, Spain
223
FHNW, University of Applied Sciences Northwestern Switzerland, Windisch, Switzerland
224
UPES, University of Petroleum and Energy Studies, Dehradun, India
225
GANIL, Grand Accélérateur National d’Ions Lourds, Caen, France
226
Université Caen Normandie, Caen, France
227
UFRGS, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
228
Technische Universität Darmstadt, Darmstadt, Germany
229
Universidade de Coimbra, Coimbra, Portugal
230
UFPel, Universidade Federal de Pelotas, Pelotas, Brazil
231
University of California Santa Cruz, Santa Cruz, CA, USA
232
Università del Salento, Lecce, Italy
233
Brown University, Providence, RI, USA
234
University of California Berkeley, Berkeley, CA, USA
235
Università di Torino, Turin, Italy
236
Johns Hopkins University, Baltimore, MD, USA
237
Fudan University, Shanghai, People’s Republic of China
238
LAPTh, Laboratoire d’Annecy-le-Vieux de Physique Théorique, Annecy-le-Vieux, France
239
Dongguan University of Technology, Dongguan, People’s Republic of China
240
Kahramanmaraş Sütçü İmam Üniversitesi, Kahramanmaraş, Türkiye
241
UNACH, Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Mexico
242
MCTP, Mesoamerican Centre for Theoretical Physics, Tuxtla Gutiérrez, Mexico
243
UAZ, Universidad Autónoma de Zacatecas, Zacatecas, Mexico
244
University of Jyväskylä, Jyväskylä, Finland
245
Technische Universität Dortmund, Dortmund, Germany
246
Overleaf, London, UK
247
University of Virginia, Charlottesville, VA, USA
248
Cornell University, Ithaca, NY, USA
249
FIT, Florida Institute of Technology, Melbourne, FL, USA
250
Shirokuma GmbH, Zurich, Switzerland
251
National Centre for Physics, Islamabad, Pakistan
252
Johannes Gutenberg Universität Mainz, Mainz, Germany
253
PAEC, Pakistan Atomic Energy Commission, Islamabad, Pakistan
254
Mathabhanga College, Mathabhanga, India
255
Harish-Chandra Research Institute, Prayagraj, India
256
MPIK, Max-Planck-Institut für Kernphysik Heidelberg, Heidelberg, Germany
257
European Spallation Source ERIC, Lund, Sweden
258
Centre de calcul de l’IN2P3, Villeurbanne, France
259
GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
260
IBS, Institute for Basic Science, Center for Theoretical Physics of the Universe, Daejeon, Republic of Korea
261
University of Warsaw, Warsaw, Poland
262
University of Ljubljana, Ljubljana, Slovenia
263
Jozef Stefan Institute, Ljubljana, Slovenia
264
Microhumus, Bureau d’étude et d’ingénierie spécialisé dans la gestion des sols dégradés, Nancy, France
265
Fakultät für Physik und Astronomie, Universität Heidelberg, Heidelberg, Germany
266
Niğde Ömer Halisdemir Üniversitesi, Niğde, Türkiye
267
Giresun Üniversitesi, Giresun, Türkiye
268
University of Miskolc, Miskolc, Hungary
269
NTUA, National Technical University of Athens, Athens, Greece
270
Transmutex SA, Geneva, Switzerland
271
DIAS, Dublin Institute for Advanced Studies, School of Theoretical Physics, Dublin, Ireland
272
AGH, University of Science and Technology, Kraków, Poland
273
University of Science and Technology of Mazandaran, Behshahr, Iran
274
IPPP, Institute for Particle Physics Phenomenology, Durham University, Durham, UK
275
Bursa Uludağ Üniversitesi, Bursa, Türkiye
276
YU, Yonsei University, Seoul, Republic of Korea
277
CERN, Geneva, Switzerland
278
CPT, Centre de Physique Théorique, Marseille, France
279
Aix-Marseille Université et Université du Sud Toulon Var, Marseille, France
280
KIAS, Korea Institute for Advanced Study, Seoul, Republic of Korea
281
Carleton University, Ottawa, Canada
282
FEAC Engineering P.C., Patras, Greece
283
UPATRAS, University of Patras, Patras, Greece
284
University of Kansas, Lawrence, KS, USA
285
AUTH, Aristotle University of Thessaloniki, Thessaloniki, Greece
286
IML, Fraunhofer-Institut für Materialfluss und Logistik, Dortmund, Germany
287
RWTH Aachen, Rheinisch-Westfälische Technische Hochschule Aachen, Aachen, Germany
288
ZHAW, Zurich University of Applied Sciences, Winterthur, Switzerland
289
Universität Münster, Münster, Germany
290
University of the Witwatersrand, Johannesburg, South Africa
291
Fachhochschule Technikum Wien, Vienna, Austria
292
University of California Irvine, Irvine, CA, USA
293
Northeastern University, Boston, MA, USA
294
ESI, European Scientific Institute, Archamps, France
295
UOS, University of Seoul, Seoul, Republic of Korea
296
KNU Kyungpook National University, Daegu, Republic of Korea
297
KU, Korea University, Seoul, Republic of Korea
298
Tampere University, Tampere, Finland
299
University of Edinburgh, Edinburgh, UK
300
BG Ingénieurs Conseils, Lausanne, Switzerland
301
T.-D. Lee Institute, Shanghai, People’s Republic of China
302
Shanghai Jiao Tong University, Shanghai, People’s Republic of China
303
CNR, Consiglio Nazionale delle Ricerche, Rome, Italy
304
University of Michigan, Ann Arbor, MI, USA
305
University of Pennsylvania, Philadelphia, PA, USA
306
University of Minnesota, Minneapolis, MN, USA
307
ESRF, European Synchrotron Radiation Facility, Grenoble, France
308
SUSSEX, University of Sussex, Brighton, UK
309
Università di Bari Aldo Moro, Bari, Italy
310
University of Bath, Bath, UK
311
Scuola Normale Superiore di Pisa, Pisa, Italy
312
Universidade de São Paulo, São Paulo, Brazil
313
Universität Graz, Graz, Austria
314
Center for High Energy Physics, Fayoum University, Fayoum, Egypt
315
Center of Theoretical Physics, British University in Egypt, Cairo, Egypt
316
Cairo University, Cairo, Egypt
317
Sorbonne Université et Université Paris Cité, Paris, France
318
Università di Genova, Genoa, Italy
319
IFIC-CSIC/UV, Instituto de Física Corpuscular, Consejo Superior de Investigaciones Científicas/Universidad de Valencia, Valencia, Spain
320
Service de géologie, sols et déchets du canton de Genève, Geneva, Switzerland
321
NICPB, National Institute for Chemical Physics and Biophysics, Tallinn, Estonia
322
UT, University of Tartu, Tartu, Estonia
323
Universidad de Salamanca, Salamanca, Spain
324
UGTO, Universidad de Guanajuato, Guanajuato, Mexico
325
Edaphos Engineering, Geneva, Switzerland
326
Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
327
Tata Institute of Fundamental Research Mumbai, Mumbai, India
328
Universiteit Gent, Ghent, Belgium
329
CNR-IOM, Consiglio Nazionale delle Ricerche, Trieste, Italy
330
JKU, Johannes Kepler Universität Linz, Linz, Austria
331
University of Stavanger, Stavanger, Norway
332
Universidad Nacional de Colombia, Bogotá, Colombia
333
Trento Institute for Fundamental Physics and Applications, Trento, Italy
334
Caltech, California Institute of Technology, Pasadena, CA, USA
335
Università della Calabria, Rende, Italy
336
IFT, Instituto de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
337
UPC, Universitat Politècnica de Catalunya, Barcelona, Spain
338
Departamento de Física, Universidade do Minho, Braga, Portugal
339
Centro de Física das Universidades do Minho e do Porto, Porto, Portugal
340
LaPMET, Laboratory of Physics for Materials and Emergent Technologies, Porto, Portugal
341
University of Bergen, Bergen, Norway
342
Instituto Milenio de Física Subatómica en la Frontera de Altas Energías, SAPHIR, Santiago, Chile
343
Universidad Andres Bello, Santiago, Chile
344
IIP, International Institute of Physics, Natal, Brazil
345
Tokyo International University, Tokyo, Japan
346
Izmir Bakırçay Üniversitesi, Izmir, Türkiye
347
INFN, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso, Assergi, Italy
348
Universitá degli Studi di Cassino e del Lazio Meridionale, Cassino, Italy
349
Vinc̆a Institute of Nuclear Sciences, Belgrade, Serbia
350
Kennesaw State University, Kennesaw, GA, USA
351
Università di Pavia, Pavia, Italy
352
Columbia University, New York, NY, USA
353
Department of Energy of the United States of America, DOE, Washington, DC, USA
354
IPSA, Institut Polytechnique des Sciences Avancées, Ivry-sur-Seine, France
355
Università degli Studi del Sannio, Benevento, Italy
356
UJ, Jagiellonian University, Kraków, Poland
357
Universität Wien, Vienna, Austria
358
Institut für Angewandte Physik, Goethe-Universität Frankfurt, Frankfurt am Main, Germany
359
HFFH, Helmholtz Forschungsakademie Hessen für FAIR, Frankfurt am Main, Germany
360
INCDTIM, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
361
University of Arizona, Tucson, AZ, USA
362
Technische Universität Dresden, Dresden, Germany
363
RTU, Riga Technical University, Riga, Latvia
364
Lancaster University, Lancaster, UK
365
University of Cyprus, Nicosia, Cyprus
366
Cosmos Open University, Nicosia, Cyprus
367
CBPF, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
368
Universität Bonn, Bonn, Germany
369
CMU, Chiang Mai University, Chiang Mai, Thailand
370
JLAB, Thomas Jefferson National Accelerator Facility, Newport News, VA, USA
371
ESPOL, Escuela Superior Politécnica del Litoral, Guayaquil, Ecuador
372
IRB, Rudjer Boskovic Institute, Zagreb, Croatia
373
Air Liquide Advanced Technologies, Grenoble, France
374
VU Amsterdam, Amsterdam, The Netherlands
375
INGÉROP, Groupe d’ingénierie et de conseil en mobilité durable, transition énergétique et cadre de vie, Lyon, France
376
Warsaw University of Technology, Warsaw, Poland
377
IFCA, Instituto de Física de Cantabria, Santander, Spain
378
Institut für Beschleunigerphysik und Technologie, Eggenstein-Leopoldshafen, Germany
379
Uşak Üniversitesi, Uşak, Türkiye
380
ICEPP, International Center for Elementary Particle Physics, University of Tokyo, Tokyo, Japan
381
Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, UK
382
All Souls College, University of Oxford, Oxford, UK
383
Akdeniz Üniversitesi, Antalya, Türkiye
384
Latitude Durable SARL, Geneva, Switzerland
385
USAL, Universidad de Salamanca, Salamanca, Spain
386
PRISMA+ Cluster of Excellence, Mainz, Germany
387
Michigan State University, East Lansing, MI, USA
388
Universidad Complutense Madrid, Madrid, Spain
389
scMetrology SARL, Geneva, Switzerland
390
IST, Instituto Superior Tecnico, Universidade de Lisboa, Lisbon, Portugal
391
Center of Physics and Engineering of Advanced Materials, CeFEMA, Lisbon, Portugal
392
Indian Institute of Science Education and Research Mohali, Mohali, India
393
NIU, Northern Illinois University, DeKalb, IL, USA
394
Banaras Hindu University, Varanasi, India
395
Comenius University, Bratislava, Slovakia
396
Monash University, Melbourne, Australia
397
Slovak Academy of Sciences, Bratislava, Slovakia
398
KAIST, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
399
Amberg Engineering Chambéry, Chambéry, France
400
Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
401
University of Tennessee, Knoxville, TN, USA
402
IFIC-CSIC/UV, Instituto de Física Corpuscular, Consejo Superior de Investigaciones Científicas/Universidad de Valencia, Valencia, Spain
403
WIFO, Österreichisches Institut für Wirtschaftsforschung, Vienna, Austria
404
Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
405
Mélica, NATURA SCOP, Études et expertises environnementales, Aubenas, France
406
Università LUM, Casamassima, Italy
407
University of Twente, Enschede, The Netherlands
408
Arak University, Arak, Iran
409
Università di Trieste, Trieste, Italy
410
ForestAllia, Cabinet de gestion et d’expertise forestières, Besançon, France
411
Universität Siegen, Siegen, Germany
412
University of Oregon, Eugene, OR, USA
413
Universität Rostock, Rostock, Germany
414
CEGELEC SA, Geneva, Switzerland
415
KTH, Royal Institute of Technology, Stockholm, Sweden
416
OKC, Oskar Klein Centre for Cosmoparticle Physics, Stockholm, Sweden
417
Brigham Young University, Provo, UT, USA
418
Expert foncier et agricole, Chadrat, France
419
ITSM, Institut für Thermische Strömungsmaschinen und Maschinenlaboratorium, Universität Stuttgart, Stuttgart, Germany
420
École Normale Supérieure de Lyon, Lyon, France
421
CTU, Czech Technical University, Prague, Czech Republic
422
University of Chicago, Chicago, IL, USA
423
Baylor University, Waco, TX, USA
424
University of Birmingham, Birmingham, UK
425
University of Southampton, Southampton, UK
426
Swisstopo, Federal Office of Topography, Wabern, Switzerland
427
Daresbury Laboratory, Science and Technology Facilities Council, Daresbury, UK
428
IZTECH, Izmir Yüksek Teknoloji Enstitüsü, Izmir, Türkiye
429
City University of Hong Kong, Hong Kong, Hong Kong
Received:
16
June
2025
Accepted:
16
September
2025
Published online:
17
November
2025
In response to the 2020 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. This report describes the FCC integrated programme, which consists of two stages: an electron-positron collider (FCC-ee) in the first phase, serving as a high-luminosity Higgs, top, and electroweak factory; followed by a proton-proton collider (FCC-hh) at the energy frontier in the second phase. The FCC-ee is designed to operate at four key centre-of-mass energies: the Z pole, the WW pair production threshold, the ZH production peak, and the top/anti-top production threshold—each delivering the highest possible luminosities to four experiments. Over 15 years of operation, FCC-ee will produce more than 6 trillion Z bosons, 200 million WW pairs, nearly 3 million Higgs bosons, and 2 million top anti-top pairs. Precise energy calibration at the Z pole and WW threshold will be achieved through frequent resonant depolarisation of pilot bunches. The sequence of operation modes between the Z, WW, and ZH substages remains flexible. The FCC-hh will operate at a centre-of-mass energy of approximately 85 TeV—nearly an order of magnitude higher than the LHC—and is designed to deliver 5 to 10 times the integrated luminosity of the upcoming High-Luminosity LHC. Its mass reach for direct discovery extends to several tens of TeV. In addition to proton-proton collisions, the FCC-hh is capable of supporting ion-ion, ion-proton, and lepton-hadron collision modes. This second volume of the Feasibility Study Report presents the complete design of the FCC-ee collider, its operation and staging strategy, the full-energy booster and injector complex, required accelerator technologies, safety concepts, and technical infrastructure. It also includes the design of the FCC-hh hadron collider, development of high-field magnets, hadron injector options, and key technical systems for FCC-hh.
S. Beuvier and M. Klein are deceased.
M. Benedikt is Study Leader.
F. Zimmermann is Deputy Study Leader.
B. Auchmann, W. Bartmann, J.P. Burnet, C. Carli, A. Chancé, P. Craievich, M. Giovannozzi, C. Grojean, J. Gutleber, K. Hanke, A. Henriques, P. Janot, C. Lourenço, M. Mangano, T. Otto, J. Poole, S. Rajagopalan, T. Raubenheimer, E. Todesco, L. Ulrici, T. Watson and G. Wilkinson are Editors
© The Author(s) 2025
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

