2025
09/17
OPEN
Date
2025/09/17（Wed.）13:30 – 15:00
Venue
3rd build. 7F Meeting room + Zoom
Speaker
Karsten Buesser (DESY)、Maxim Titov (CEA-Saclay)
Language
English
URL
Contact
Terunuma Nobuhiro (PHS 4023)
Lecture1: Karsten Buesser (DESY)
LCF4CERN – A Linear Collider Facility for CERN
Europe is preparing for the update of the European Strategy for Particle Physics of CERN Council. The strategy should be finalized in 2026 and it is expected that it will contain a recommendation for the next energy frontier collider project for CERN. European particle physics communities have already provided input for the strategy and there is a broad consensus that the Future Circular Collider FCC is the preferred project to provide interesting physics capabilities while securing CERN’s long-term future and leading role in particle physics. On the other hand, it is understood that the predicted FCC cost are too large to be covered from the CERN budget alone and that significant contributions would have to be found elsewhere. It seems therefore to be prudent to develop a less-costly option („Plan B“) for CERN’s future. The Linear Collider Vision team has started to assemble a proposal for a versatile Linear Collider Facility at CERN. In the baseline configuration it should start with a ~33km long tunnel, to be equipped with ILC-like superconducting technology. A sustainable upgrade path to higher energies and luminosities would enable a 20y+ physics program for electroweak, Higgs, and Top-Physics. The tunnel infrastructure would also allow for long term upgrades into the multi-TeV regime using other technologies, e.g., copper based RF (CLIC, C3) or Plasma Wakefield acceleration. Additionally, other physics modes like gamma-gamma collisions, should be made possible.
Lecture2: Maxim Titov (CEA-Saclay)
Environmental Impact and Considerations for Future Accelerators
The sustainability of future accelerator-based projects is increasingly central to their scientific, economic, and societal viability. The European Laboratory Directors Group (LDG) established the Working Group (WG) on the Sustainability Assessment of Accelerators in early 2024: https://ldg.web.cern.ch/working-groups/sustainability-assessment-of-accelerators. The WG mandate was to develop guidelines and a list of key parameters for the assessment of the sustainability of future accelerators in particle physics and to promote transparent, open discussions within research communities. This talk will highlight LDG Sustainability WG report, which will become (became) public in Sep. 2025. This document establishes a reference framework, summarizing the best practices and standards for assessing and guiding the sustainable development of large-scale facilities. Nature-based interventions and circular economy principles are proposed as complementary strategies to offset residual impacts (e.g. Green ILC in Japan).