ATF report 2020

The KEK accelerator test faciliry (ATF) conducts R&D on a beam for the Linear Collider. The damping ring provides a low emittance electron beam and the final focus test beamline (ATF2) provides studies on small beam of nanometer level by utilizing a low emittance beam. These R&D are conducted under the ATF international collaboration with many contributions of graduate students around the world. A review meeting to discuss the further studies at ATF will be held on Septem- ber 29, 2020 as a short tele-conference. This report provides the information necessary for discussion. We summarize the remaining studies that will be done in the coming years and ILC preparatory period for further improvements of nanometer beam techno- logy, and the use of ATF facility as a test bench for ILC subsystem in the preparatory period and after. The possible utilizations of the ATF/ATF2 beams for R&D beyond Linear Colliders are also presented.