Science Cases and Collaborative Framework

• Patrice Verdier (IP2I Lyon - IN2P3)

Room: Bat 141, salle André Berthelot (143) Key science drivers (GW astrophysics, fundamental physics, cosmology) ET collaboration structure and international coordination

Computing

• Patrice Verdier (IP2I Lyon - IN2P3)

Room: Bat 141, salle André Berthelot (143) Data challenges and expected data rates Computing models and infrastructure needs Synergies with existing GW computing frameworks

Optical Design, Configuration, and Infrastructure

• Jerome DEGALLAIX (Laboratoire des Matéraux Avancés)

Room: Bat 141, salle André Berthelot (143) Detector configuration and topology Optical layout and performance targets Underground infrastructure implications

R&D Roadmap

• Angélique Lartaux (IJCLab)

Room: Bat 141, salle André Berthelot (143) Key technological challenges Current R&D activities Milestones toward ET construction

Infrastructure, Cryogenics, Vacuum, and Vibrations

• Christian Olivetto (CNRS/IN2P3)

Room: Bat 141, salle André Berthelot (143) Underground infrastructure requirements Cryogenic systems Vacuum systems Seismic isolation and vibration control

Conclusion

• Etienne Savalle (CEA/DRF/IRFU/DPhP)

Room: Bat 141, salle André Berthelot (143)