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The Accelerator Test Facility (ATF) in KEK is a research center for studies on issues concerning the injector, damping ring, and beam delivery system for the ILC. It comprises a multibunch-capable RF gun, a 1.3 GeV electron linac, a damping ring, and a test beam line for ILC final focus system (ATF2). Goals of ATF/ATF2 are the achievement of 2 pm vertical emittance, demonstration of a ILC like multi-bunch extraction, achievement of the 37 nm vertical beam size, and stabilization of such beam in a few nano meter level. These targets are supported by R&Ds, such as upgrade of DR BPMs, fast kicker, cavity BPMs, laser-wire, intra-train feedback system (FONT) and a Laser-fringe beam size monitor. To continue providing vital opportunities for accelerator development with the world community, the international collaboration was established.
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