核理研から電子光センター，50年の歩み

抄録

Research Center for Electron Photon Science(ELPH) at Tohoku University had passed fifty years since the establishment of Laboratory of Nuclear Science (LNS) affiliated to the Graduate School of Science, the forerunner of the present center. LNS started in 1966 as a user’s facility available to the researchers in Tohoku University. The pulsed electron beam from the 300 MeV LINAC, which was constructed in 1967, has been widely utilized for not only nuclear physics but also other research fields such as material science and nuclear chemistry. In also the same 1967, experiments with the pulsed neutron generated by the accelerator were started for the first time in the world. Since then a lot of pioneer works had been performed till the termination of the neutron facility in 1993. Furthermore, it was first demonstrated in the world to stretch the pulsed beam from LINAC by a pulse‐stretcher ring in 1981. This ring had led some distinguished researches in nuclear physics and been succeeded to the 1.2 GeV stretcher-booster ring in 1995. After the reorganization from LNS in 2009, ELPH has conducted significant research and educational activities as a part of Joint Usage / Research Centers since FY 2011. In this article we would like to introduce the history for these 50 years up to the commemorating ceremony for the 50th anniversary of the establishment held on the last November, focusing on the vicissitudes of the electron accelerator complex and the roles played at that each time.