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Two Japanese institutes, the High Energy Accelerator Research Organization (KEK) and the Japan Atomic Energy Agency (JAEA; formerly JAERI and JNC), proposed each own 5-6 GeV ERL project for the future light source. Thereafter, the two institutes agreed to promote an ERL-based next-generation synchrotron light source in Japan based on their stimulated technologies. As a first step towards this course, KEK and JAEA are planning to construct together an ERL test facility at KEK site in order to resolve technical and physical challenges. The ERL test facility will comprise a 5-10 MeV injector, a superconducting main linac, and a return loop. The beam energy of the main linac will initially be a few tens of MeV, and will be upgraded up to about 200 MeV. We are also promoting cooperation with the other Japanese SR facilities, SPring-8, UVSOR, and ISSP, to organize an R&D team for the ERL test facility. We present current status and plans of the KEK-JAEA ERL project.
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