Accelerator Test Facility (ATF) of KEK is a research center for studies on issues concerning the injector, damping ring, and beam delivery system for the ILC. The ATF damping ring reduces the vertical emittance of the beam down to 4 pmÅrad. ATF2 is a final-focus test beam line that aims to focus the low emittance beam from the damping ring to a vertical size of about 37 nm and to demonstrate the nanometer level beam stability, using numerous advanced beam diagnostics and feedback tools. These tools have been developed through R&D at the ATF, and applied for the newly constructed ATF2 beam line. Further improvements will be continued in parallel to the commissioning of the nanometer beam focus. A large number of scientists from SLAC, LBNL, FNAL, Oxford University, DESY, CERN, UCL, LLNL, IHEP, PAL, RHUL and Japanese universities participated in research programs at the ATF/ATF2.
