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The International Linear Collider (ILC) is a next-generation experimental facility to explore fundamental laws of the Universe. The importance of electron-positron linear colliders as a future experimental facility has been long recognized by the worldwide high energy physics community. A global design team, the Global Design Efforts (GDE), was set up under the International Committee for Future Accelerators (ICFA) for design and coordination of R&D activities of the ILC in 2005, and the ILC Technical Design Report (TDR) was completed in 2013. ICFA then established the Linear Collider Collaboration (LCC) and the Linear Collider Board (LCB) and has continued to support the worldwide efforts for realizing the ILC. Meanwhile, in 2012, KEK and the high energy physics community in Japan proposed that Japan should host the ILC, which was welcomed by the worldwide high energy physics community. Implementation of the ILC project will require strong involvements from international partners due to its scientific importance and large scale. Aspects of international cost sharing and governance of the organization carrying out the ILC project will need to be discussed and agreed at the governmental level. Therefore, KEK established an International Working Group (WG) on the ILC Project in May 2019, inviting scientific experts worldwide* , and asking them to study international aspects of the project implementation from viewpoints of researchers. They were requested to create a report on model of international cost sharing for construction and operation, organization and governance of the ILC Laboratory, and international sharing of the remaining technical preparation. The WG report was submitted to KEK on September 25, 2019. After reviewing the content of the report, KEK decided to make it available within this document entitled "Recommendations on ILC Project Implementation". This document summarizes the deliberations from researchers' viewpoints; it does not intend to pre-empt governments and funding agencies. It is ...

The International Linear Collider (ILC) is a next-generation experimental facility to explore fundamental laws of the Universe. The importance of electron-positron linear colliders as a future experimental facility has been long recognized by the worldwide high energy physics community. A global design team, the Global Design Efforts (GDE), was set up under the International Committee for Future Accelerators (ICFA) for design and coordination of R&D activities of the ILC in 2005, and the ILC Technical Design Report (TDR) was completed in 2013. ICFA then established the Linear Collider Collaboration (LCC) and the Linear Collider Board (LCB) and has continued to support the worldwide efforts for realizing the ILC. Meanwhile, in 2012, KEK and the high energy physics community in Japan proposed that Japan should host the ILC, which was welcomed by the worldwide high energy physics community. Implementation of the ILC project will require strong involvements from international partners due to its scientific importance and large scale. Aspects of international cost sharing and governance of the organization carrying out the ILC project will need to be discussed and agreed at the governmental level. Therefore, KEK established an International Working Group (WG) on the ILC Project in May 2019, inviting scientific experts worldwide* , and asking them to study international aspects of the project implementation from viewpoints of researchers. They were requested to create a report on model of international cost sharing for construction and operation, organization and governance of the ILC Laboratory, and international sharing of the remaining technical preparation. The WG report was submitted to KEK on September 25, 2019. After reviewing the content of the report, KEK decided to make it available within this document entitled "Recommendations on ILC Project Implementation". This document summarizes the deliberations from researchers' viewpoints; it does not intend to pre-empt governments and funding agencies. It is ...

The International Linear Collider (ILC) is a next-generation experimental facility to explore fundamental laws of the Universe. The importance of electron-positron linear colliders as a future experimental facility has been long recognized by the worldwide high energy physics community. A global design team, the Global Design Efforts (GDE), was set up under the International Committee for Future Accelerators (ICFA) for design and coordination of R&D activities of the ILC in 2005, and the ILC Technical Design Report (TDR) was completed in 2013. ICFA then established the Linear Collider Collaboration (LCC) and the Linear Collider Board (LCB) and has continued to support the worldwide efforts for realizing the ILC. Meanwhile, in 2012, KEK and the high energy physics community in Japan proposed that Japan should host the ILC, which was welcomed by the worldwide high energy physics community. Implementation of the ILC project will require strong involvements from international partners due to its scientific importance and large scale. Aspects of international cost sharing and governance of the organization carrying out the ILC project will need to be discussed and agreed at the governmental level. Therefore, KEK established an International Working Group (WG) on the ILC Project in May 2019, inviting scientific experts worldwide* , and asking them to study international aspects of the project implementation from viewpoints of researchers. They were requested to create a report on model of international cost sharing for construction and operation, organization and governance of the ILC Laboratory, and international sharing of the remaining technical preparation. The WG report was submitted to KEK on September 25, 2019. After reviewing the content of the report, KEK decided to make it available within this document entitled "Recommendations on ILC Project Implementation". This document summarizes the deliberations from researchers' viewpoints; it does not intend to pre-empt governments and funding agencies. It is ...

A large, world-wide community of physicists is working to realise an exceptional physics program of energy-frontier, electron-positron collisions with the International Linear Collider (ILC). This program will begin with a central focus on high-precision and model-independent measurements of the Higgs boson couplings. This method of searching for new physics beyond the Standard Model is orthogonal to and complements the LHC physics program. The ILC at 250 GeV will also search for direct new physics in exotic Higgs decays and in pair-production of weakly interacting particles. Polarised electron and positron beams add unique opportunities to the physics reach. The ILC can be upgraded to higher energy, enabling precision studies of the top quark and measurement of the top Yukawa coupling and the Higgs self-coupling. The key accelerator technology, superconducting radio-frequency cavities, has matured. Optimised collider and detector designs, and associated physics analyses, were presented in the ILC Technical Design Report, signed by 2400 scientists. There is a strong interest in Japan to host this international effort. A detailed review of the many aspects of the project is nearing a conclusion in Japan. Now the Japanese government is preparing for a decision on the next phase of international negotiations, that could lead to a project start within a few years. The potential timeline of the ILC project includes an initial phase of about 4 years to obtain international agreements, complete engineering design and prepare construction, and form the requisite international collaboration, followed by a construction phase of 9 years.